AUTOMATED SYSTEM PRE-CHECK METHODOLOGY AND CORRESPONDING INTERFACE

Un système de cimentation (301) est décrit. Un distributeur de boue de ciment comprend au moins une soupape de commande (905), au moins une pompe à additif liquide (340), et au moins une pompe à eau. Un ordinateur (390) a un écran (1106) pour un écran d'interface (400). L'écran d'interface (400) affiche une zone de liste (405) de tests sélectionnables disponibles pour le distributeur de boue de ciment et des choix de sélection globale correspondants, une zone de détail (410), dans lequel en réponse à la sélection de l'un des tests sélectionnables depuis la zone de liste (405), des sous-étapes du test sélectionné parmi les tests sélectionnables affichent un bouton d'activation locale (420) configuré pour commencer uniquement le test sélectionné parmi les tests sélectionnables affichés dans la zone de détail (410) ; et un bouton d'activation globale (415) configuré pour commencer tous les tests sélectionnables dans la zone de liste (405) qui sont indiqués comme sélectionnés par les choix ...

MOTOR CONTROL OF VARIABLE FREQUENCY DRIVES

Divers modes de réalisation comprennent un appareil de commande de moteur à entraînement à fréquence variable (104). L'appareil comprend une commande principale (110) ayant une première interface (115). Une commande de moteur (112) est couplée à et commande un moteur électrique (114), la commande de moteur (112) étant également couplée à la commande principale (110). Un commutateur de réseau (111) est couplé à la commande principale (110), la commande du moteur (112) et une commande à distance (105) via des connexions numériques respectives. La commande à distance (105) comporte une deuxième interface (106). Le réseau commute des données entre la première interface (115), la deuxième interface (106) et la commande du moteur (112). Un coupleur de réseau (113) est couplé entre une commande d'entraînement à fréquence variable (103) et la commande du moteur (112).

PRE-VERIFICATION METHODOLOGY FOR AUTOMATED SYSTEM AND CORRESPONDING INTERFACE

NOTIFICATION SYSTEM FOR ENGINE AND TRANSMISSION USING A BONDING INTERFACE DATA J1939

La présente divulgation concerne un système de cimentation comprenant un module de commande de moteur (306), un module de commande de transmission (308), un dispositif informatique (322, 700) et un affichage (326). Le module de commande de moteur (306) est couplé en communication à une pluralité de capteurs de moteur (302). Le module de commande de transmission (308) est couplé en communication à une pluralité de capteurs de transmission (304). Le dispositif informatique (322, 700) est couplé en communication avec l'affichage (326) et couplé en communication, par au moins une liaison de données J1939, avec le module de commande de moteur (306) et avec le module de commande de transmission (308). Le dispositif informatique (322, 700) est configuré pour recevoir des données d'au moins l'un du module de commande de moteur (306) ou du module de commande de transmission (308) ; comparer les données reçues à une liste de codes enregistrés ; et en réponse à une concordance entre les données reçues ...

Method for forming durable combination prints

Methods forming a durable combination print and a printed article are provided. In one aspect, a first receiver is provided with a first thickness at a first edge and having a first toner image on a first side with toner at least in an overlap area proximate the first edge and toner forming a toner edge shield. The first edge and overlap area are overlapped with a second receiver having a second thickness at a second edge; and, the first receiver and the second receiver are fused to cause the toner in the overlap area to bond the first receiver to the second receiver. The first toner image includes a toner edge shield with a first end confronting the second edge that extends from the first side of the first receiver to at least about 50% of the second thickness and has a deflection surface sloped toward a second end.

Polycarboxylic Acid Gelling Agents

Scale inhibiting particulates formed from a mixture of fly ash and a phosphonic acid curing agent; wherein the fly ash is cured into a solid material by the contact with the phosphonic acid curing agent. The mixture may also contain a multivalent ion and the particulates may be coated with a coating material in an amount from about 0.1% to about 40% coating material by weight of the scale inhibiting particulate to delay the release of the scale inhibitor. 120.-. (canceled)21. A gelling agent comprising a copolymer that comprises:a 2-acrylamido-2-methylpropanesulfonic acid monomeric unit;a polycarboxylic acid monomeric unit; andan acrylamide monomeric unit.22. The fluid of wherein the monomeric units are arranged in a random fashion in the copolymer.23. The fluid of wherein the weight fraction of 2-acrylamido-2-methylpropanesulfonic acid in the copolymer is from about 15% to about 80% by weight; the weight fraction of the polymerizable polycarboxylic acid in the copolymer is from about 0.1% to about 1.0% by weight; and the acrylamide comprises the balance of the weight of the copolymer.24. The fluid of wherein the polycarboxylic acid copolymer gelling agent comprises a polymerizable polycarboxylic acid that comprises vicinal carboxylic acid groups.25. The fluid of wherein the polycarboxylic acid copolymer gelling agent comprises at least one of the following: itaconic acid claim 21 , maleic acid claim 21 , 3-butene-1 claim 21 ,2 claim 21 ,3-tricarboxylic acid; and a derivative thereof.26. A gelling agent that comprises a polymerizable polycarboxylic acid and that is at least partially crosslinked by a reaction comprising a crosslinking agent and a polycarboxylic acid copolymer gelling agent.27. The fluid of wherein the crosslinking agent comprises at least one of the following: a zirconium-based crosslinking agent claim 26 , a titanium-based cross linking agent claim 26 , or a hafnium-based crosslinking agent.28. The fluid of wherein the polycarboxylic acid copolymer ...

High Temperature Fracturing Fluids and Methods

Subterranean treatment fluids comprising: an aqueous base fluid and a reaction product of a gelling agent comprising a copolymer or salt thereof comprising N-[tris(hydroxymethyl)methyl]acrylamide, 2-acrylamido-2-methylpropanesulfonic acid or a salt thereof, acrylamide; and a crosslinking agent. Such treatment fluids are particularly well-suited for high temperature applications. In particular, they are suited for subterranean temperatures up to about 400° F. 121-. (canceled)22. A subterranean treatment fluid comprising:an aqueous base fluid; and,a gelling agent comprising a copolymer or salt thereof comprising N-[tris(hydroxymethyl)methyl]acrylamide, 2-acrylamido-2-methylpropanesulfonic acid, and acrylamide; and,a crosslinking agent.23. The subterranean treatment fluid of wherein the gelling agent copolymer further comprises acrylic acid or a salt thereof.24. The subterranean treatment fluid of wherein the crosslinking agent comprises at least one component that comprises a zirconium or titanium metal ion.25. The subterranean treatment fluid of wherein the treatment fluid is foamed.26. The subterranean treatment fluid of wherein 2-acrylamido-2-methylpropanesulfonic acid is present in the copolymer in an amount in the range of about 15 weight % to about 80 weight % claim 23 , the acrylamide is present therein in an amount in the range of about 10 weight % to about 50 weight % claim 23 , the N-[tris(hydroxymethyl)methyl]acrylamide is present therein in an amount in the range of about 0.1 weight % to about 10 weight % claim 23 , and the acrylic acid (or salts thereof) is present therein in an amount in the range of about 0.1 weight % to about 10 weight %.27. The subterranean treatment fluid of wherein the treatment fluid further comprises an additive chosen from the group consisting of:crosslinking delaying agent, a stabilizing agent, an internal delayed gel breaker, a gel stabilizer, a pH adjusting agent, a fluid loss control additive, an acid, a corrosion inhibitor, ...

Thermally-Activated, High-Temperature Cement Suspending Agent

Methods of providing a cementing fluid comprising an aqueous liquid, a hydraulic cement, and a cement suspending agent that comprises a crosslinked particulate formed by a reaction comprising a first monofunctional monomer, a primary crosslinker, and a secondary crosslinker; placing the cementing fluid in a wellbore penetrating a subterranean formation; and allowing the cementing fluid to set therein. 1. A method comprising:providing a cementing fluid comprising an aqueous liquid, a hydraulic cement, and a cement suspending agent, wherein the cement suspending agent comprises a crosslinked particulate formed by a reaction comprising a first monofunctional monomer, a primary crosslinker, and a secondary crosslinker;placing the cementing fluid in a wellbore penetrating a subterranean formation; andallowing the cementing fluid to set therein.2. The method of claim 1 , wherein the subterranean formation is about 225° F. to about 600° F.3. The method of claim 1 , wherein the crosslinked particulate begins to degrade and dissolve above about 225° F.4. The method of further comprising:placing a spacer fluid comprising the cement suspending agent in the wellbore before and/or after placing the cementing fluid in the wellbore.5. The method of claim 4 , wherein the cement suspending agent is at a different concentration in the spacer fluid than in the cementing fluid.6. The method of claim 1 , wherein the first monofunctional monomer comprises a monomer selected from the group consisting of N claim 1 ,N-dimethylacrylamide claim 1 , sodium 2-acrylamido-2-methylpropanesulfonate claim 1 , 2-acrylamido-2-methylpropanesulfonic acid claim 1 , N-(hydroxymethyl)acrylamide claim 1 , N-(hydroxyethyl)acrylamide claim 1 , acrylamide claim 1 , methacrylamide claim 1 , N-vinylformamide claim 1 , 1-vinyl-2-pyrrolidinone claim 1 , N-vinylcaprolactam claim 1 , N-acryloyl morpholine claim 1 , N-methyl-N-vinylacetamide claim 1 , N-isopropylacrylamide claim 1 , N claim 1 ,N-diethylacrylamide ...

Delayed, Swellable Particles for Prevention of Fluid Migration Through Damaged Cement Sheaths

A method includes providing a cementing composition that includes an aqueous fluid, a cementitious particulate, and a copolymer particulate which includes a monofunctional monomer, a water degradable first crosslinker, and a second crosslinker. The method further includes placing the cementing composition in a subterranean formation so as to form a set cement sheath and swelling the copolymer particulate in response to a void created in the set cement sheath. The copolymer particulate allows the cementing composition to set to form the cement sheath before substantial swelling of the copolymer particulate occurs. 1. A method comprising: a monofunctional monomer;', 'a water degradable first crosslinker; and', 'a second crosslinker;, 'providing a cementing composition comprising an aqueous fluid; a cementitious particulate; and a copolymer particulate comprisingplacing the cementing composition in a subterranean formation so as to form a set cement sheath; and 'wherein said copolymer particulate allows the cementing composition to set to form the cement sheath before substantial swelling of the copolymer particulate occurs.', 'swelling said copolymer particulate in response to a void created in said set cement sheath;'}2. The method of claim 1 , wherein said copolymer particulate comprises particulates that have a particulate size in a range from about 100 microns to about 2000 microns.3. The method of claim 1 , wherein said monofunctional monomer comprises at least one selected from the group consisting of N claim 1 ,N-dimethylacrylamide claim 1 , 2-acrylamido-2-methylpropanesulfonic acid (AMPS) or salt thereof claim 1 , an acrylic acid salt claim 1 , a sulfonated styrene claim 1 , a vinylsulfonic acid salt claim 1 , N-(hydroxyethyl)acrylamide claim 1 , acrylamide claim 1 , N-methylacrylamide claim 1 , methacrylamide claim 1 , N-vinylformamide claim 1 , 1-vinyl-2-pyrrolidinone claim 1 , N-vinylcaprolactam claim 1 , N-acryloyl morpholine claim 1 , N-methyl-N- ...

Well Completion Methods Using Gellable Treatment Fluids Having Long Term Thermal Stability of the Gelled State

Gellable treatment fluids containing a terpolymer that comprises 2-acrylamido-2-methylpropanesulfonic acid, acrylamide, acrylic acid monomer units can be used in various subterranean operations where it is necessary for the treatment fluid to remain in a gelled state for extended periods of time at high formation temperatures. Methods for treating a subterranean formation can comprise providing a treatment fluid comprising an aqueous carrier fluid, a crosslinking agent, a gel stabilizer, and a terpolymer that comprises 2-acrylamido-2-methylpropanesulfonic acid, acrylamide, and acrylic acid monomer units, or any salt thereof; introducing the treatment fluid into a subterranean formation; allowing the treatment fluid to form a gel in the subterranean formation; and breaking the gel after it has been in the subterranean formation for at least about one day. 1. A method comprising:providing a treatment fluid comprising an aqueous carrier fluid, a crosslinking agent, a gel stabilizer, and a terpolymer that comprises 2-acrylamido-2-methylpropanesulfonic acid, acrylamide, and acrylic acid monomer units, or any salt thereof;introducing the treatment fluid into a subterranean formation;allowing the treatment fluid to form a gel in the subterranean formation; andbreaking the gel after it has been in the subterranean formation for at least about one day.2. The method of claim 1 , wherein the subterranean formation is at a temperature ranging between about 275° F. and about 350° F.3. The method of claim 1 , wherein the treatment fluid further comprises a gellation accelerator that decreases a time required to form the gel.4. The method of claim 1 , wherein the gel stabilizer comprises an antioxidant selected from the group consisting of a sulfite salt claim 1 , erythorbic acid claim 1 , ascorbic acid claim 1 , a hydroquinone claim 1 , any salt thereof claim 1 , any derivative thereof claim 1 , and any combination thereof.5. The method of claim 4 , wherein the antioxidant is ...

Methods and apparatus for configuring scheduling on a wall module

The present disclosure relates generally to building control systems and, more particularly, to methods and devices for configuring and/or displaying parameters or other information such as menu screens on a programmable wall module of a building control system. In an illustrative embodiment, a configuration tool may be configured to create a number of screens for the user interface of the programmable wall module based on a number of user inputs received via the user interface of the configuration tool. In some cases, the number of user inputs received via the user interface of the configuration tool may be less than, and sometimes far less than, the number of screens that are created by the configuration tool. Regardless, with the number of screens created, the configuration tool may upload the number of screens to the programmable wall module for use on the user interface of the programmable wall module.

Thermally-Activated, High Temperature Particulate Suspending Agents and Methods Relating Thereto

A particulate suspending agent may be useful for mitigating particulate settling in wellbore applications with high-temperature and/or at near-neutral and higher pH values. Methods of treating a wellbore may include providing a treatment fluid comprising an aqueous liquid, a plurality of particulates, and a particulate suspending agent, wherein the particulate suspending agent comprises a crosslinked polymer particulate formed by a reaction comprising a first monofunctional monomer and an orthoester crosslinker, the orthoester crosslinker comprising an orthoester linkage and at least two crosslinking moieties; and placing the treatment fluid in a wellbore penetrating a subterranean formation.

CEMENTING COMPOSITIONS AND METHODS

Cementing compositions including a di- or poly epoxide resin, and amine hardener, and a di-or polyfunctional alkylphosphonate ester fortifier and methods of using the cementing compositions such as in a subterranean zone penetrated by a well bore. 1. A composition comprising:(a) a di- or poly epoxide resin;(b) an amine hardener that is not dimethyl ethylenediamine or ethylenediamine; and(c) a di- or polyfunctional alkylphosphonate ester fortifier.2. The composition according to claim 1 , wherein(a) the di- or poly epoxide resin is one or more compounds selected from the group consisting of an epichlorohydrin adduct of a bisphenol, an epichlorohydrin adduct of a novolac, an epichlorohydrin adduct of an alkyl diol, and an epichlorohydrin adduct of a cycloalkyl diol.3. The composition according to claim 2 , wherein(a) the di- or poly epoxide resin is one or more compounds selected from the group consisting of a bisphenol A epoxy resin, a bisphenol F epoxy resin, an epoxy novolac resin, a diglycidyl ether of an aliphatic diol, a diglycidyl ether of a polyethylene glycol, a diglycidyl ether of a polypropylene glycol, a cyclohexanedimethanol diglycidyl ether, a butanediol diglycidyl ether, trimethylolpropane triglycidyl ether, a hexanediol diglycidyl ether, N,N-diglycidyl-4-glycidyloxyaniline, 4,4′-methylenebis(N,N-diglycidylaniline), neopentyl glycol diglycidyl ether, resorcinol diglycidyl ether, tetraphenylolethane glycidyl ether, tris(2,3-epoxypropyl) isocyanurate, and tris(4-hydroxyphenyl)methane triglycidyl ether.4. The composition according to claim 3 , wherein(a) the di- or poly epoxide resin is a bisphenol A diglycidyl ether resin and/or a cyclohexanedimethanol diglycidyl ether.5. The composition according to claim 1 , wherein(b) the amine hardener is an alkyl or aromatic di- or polyamine.6. The composition according to claim 5 , wherein(b) the amine hardener is one or more compounds selected from the group consisting of triethylenetetraamine, ethylenediamine, N- ...

PLUGGING DEVICES AND DEPLOYMENT IN SUBTERRANEAN WELLS

A method can include deploying a plugging device into a well, the plugging device including a body, and an outer material enveloping the body and having a greater flexibility than a material of the body, and conveying the plugging device by fluid flow into engagement with the opening, the body preventing the plugging device from extruding through the opening, and the outer material blocking the fluid flow between the body and the opening. In another method, the plugging device can include at least two bodies, and a washer element connected between the bodies, the washer element being generally disk-shaped and comprising a hole, a line extending through the hole and connected to the bodies on respective opposite sides of the washer element, the washer element preventing the plugging device from being conveyed through the opening, and the washer element blocking the fluid flow through the opening. 1. A method of plugging an opening in a subterranean well , the method comprising:deploying a plugging device into the well, the plugging device including a body, and an outer material enveloping the body, the outer material having a greater flexibility than a material of the body; andconveying the plugging device by fluid flow into engagement with the opening, the body preventing the plugging device from extruding through the opening, and the outer material blocking the fluid flow between the body and the opening.2. The method of claim 1 , further comprising forming the outer material with a relatively low density material.3. The method of claim 1 , further comprising forming the outer material with at least one of the group consisting of a foam material and a sponge material.4. The method of claim 1 , further comprising: forming the outer material with at least one of the group consisting of a wrapper claim 1 , a bag claim 1 , a fabric claim 1 , a mesh material claim 1 , a net material and a gauze material.5. A method of plugging an opening in a subterranean well claim 1 , ...

Controlled Release Microparticles

Formulations for controlled, sustained release of biologically active agents for the treatment of ocular disorders have been developed. These formulations are based on solid microparticles formed of the combination of biodegradable, synthetic polymers such as poly(lactic acid) (PLA), poly(glycolic acid) (PGA), and copolymers thereof. The microparticles are characterized by low burst levels and efficient drug loading and sustained release.

Selectively moveable valve elements for aspiration and irrigation circuits

Various arrangements of fluidics systems are disclosed. In one arrangement, an aspiration circuit for a fluidics system is disclosed that selectively controls aspiration. The aspiration circuit comprises an aspiration line operatively connected to a surgical instrument, an aspiration exhaust line operatively connected to a waste receptacle; an aspiration vent line connected at a first end to the aspiration line; and a selectively variable vent valve operatively connected to the aspiration vent line. The variable vent valve may be selectively moved to vary aspiration pressure within the aspiration line. Other fluidics systems are disclosed that include a selectively positionable irrigation valve that may also be incorporated into a fluidics system that includes a variable vent valve.

PLUGGING DEVICES AND DEPLOYMENT IN SUBTERRANEAN WELLS

A method can include deploying a plugging device into a well, the plugging device including a body, and an outer material enveloping the body and having a greater flexibility than a material of the body, and conveying the plugging device by fluid flow into engagement with the opening, the body preventing the plugging device from extruding through the opening, and the outer material blocking the fluid flow between the body and the opening. In another method, the plugging device can include at least two bodies, and a washer element connected between the bodies, the washer element being generally disk-shaped and comprising a hole, a line extending through the hole and connected to the bodies on respective opposite sides of the washer element, the washer element preventing the plugging device from being conveyed through the opening, and the washer element blocking the fluid flow through the opening. 1. A method of plugging an opening in a subterranean well , the method comprising:deploying a plugging device into the well, the plugging device including a body, and an outer material enveloping the body, the outer material having a greater flexibility than a material of the body; andconveying the plugging device by fluid flow into engagement with the opening, the body preventing the plugging device from extruding through the opening, and the outer material blocking the fluid flow between the body and the opening.2. The method of claim 1 , further comprising forming the outer material with a relatively low density material.3. The method of claim 1 , further comprising forming the outer material with at least one of the group consisting of a foam material and a sponge material.4. The method of claim 1 , further comprising: forming the outer material with at least one of the group consisting of a wrapper claim 1 , a bag claim 1 , a fabric claim 1 , a mesh material claim 1 , a net material and a gauze material.511-. (canceled)12. A method of completing a well claim 1 , the ...

WELL OPERATIONS WITH GROUPED PARTICLE DIVERTER PLUG

A method can include deploying a diverter plug into a well, the diverter plug comprising a group of particles that are prevented from dispersing, flowing fluid, thereby conveying the diverter plug into engagement with a fluid passageway, the particles conforming to a shape of the fluid passageway as the diverter plug blocks fluid flow through the fluid passageway, and the particles being prevented from dispersing while the diverter plug blocks the fluid flow through the fluid passageway. The diverter plug can include a group of particles disposed within an outer enclosure. The particles in the enclosure can conform to a shape of the fluid passageway as the diverter plug blocks fluid flow through the fluid passageway. In another method, the enclosure can sealingly engage the fluid passageway while the particles remain disposed within the enclosure. 1. A method , comprising:deploying at least one diverter plug into a well, the diverter plug comprising a group of particles disposed within an outer enclosure, and the diverter plug further comprising at least one enlarged body disposed in the enclosure;flowing fluid in the well, thereby conveying the diverter plug into engagement with a fluid passageway in the well, in which the enlarged body is too large to pass through the fluid passageway; andthe particles in the enclosure conforming to a shape of the fluid passageway as the diverter plug blocks fluid flow through the fluid passageway, in which the conforming comprises the particles occupying a space between the enclosure and the enlarged body.2. The method of claim 1 , further comprising the particles degrading in the well.3. The method of claim 1 , further comprising the enclosure degrading in the well.4. The method of claim 1 , in which claim 1 , during the deploying claim 1 , the particles are loose within the enclosure.5. The method of claim 1 , in which the conveying further comprises producing fluid drag on material extending outwardly from the diverter plug.6. ...

FLOW CONTROL IN SUBTERRANEAN WELLS

A method of controlling flow in a well can include a device introduced into the well being conveyed by flow in the well, and the device having a plurality of fibers extending outwardly from a body, the fibers being retained by a retainer. A well system can include a flow conveyed device conveyed through a tubular string by flow in the tubular string, and the flow conveyed device including a body with a plurality of fibers extending outwardly from the body. A retainer can at least partially enclose the device. A flow conveyed device for use in a well can include a body, and a plurality of fibers joined to the body, each of the fibers having a lateral dimension that is substantially smaller than a size of the body. 120-. (canceled)21. A flow conveyed device for use in a subterranean well , the device comprising:a body; anda plurality of fibers joined to the body, each of the fibers having a lateral dimension that is substantially smaller than a size of the body,wherein the fibers are retained by a retainer.22. The device of claim 21 , wherein the retainer degrades in response to passage of a predetermined period of time.23. The device of claim 21 , wherein the retainer degrades in response to exposure to a predetermined fluid.24. The device of claim 21 , wherein the retainer degrades in response to exposure to a predetermined chemical composition.25. The device of claim 21 , wherein the retainer degrades in response to exposure to a predetermined temperature.26. The device of claim 21 , wherein the retainer degrades in response to exposure to radiation.27. The device of claim 21 , wherein the fibers are joined together and form one or more lines extending outwardly from the body.28. The device of claim 27 , wherein the lines comprise ropes.29. The device of claim 21 , wherein the fibers comprise a nylon material.30. The device of claim 21 , wherein the body is degradable by exposure to an acid. The present application is a continuation-in-part of application Ser. No. ...

Pressure control in phacoemulsification system

A surgical system comprises a pressurized irrigation fluid source; an irrigation line fluidly coupled to the pressurized irrigation fluid source; a hand piece fluidly coupled to the irrigation line; an irrigation pressure sensor located at or along the pressurized irrigation fluid source or irrigation line; and a controller for controlling the pressurized irrigation fluid source. The controller controls the pressurized irrigation fluid source based on a reading from the irrigation pressure sensor and an estimated flow value modified by a compensation factor.

Fibrous barriers and deployment in subterranean wells

A fibrous plugging device for use in a subterranean well can include a body having fibers and a retainer material. The retainer material retains a shape of the body. A system for use with a well can include a fibrous plugging device conveyed by fluid flow in the well. The fibrous plugging device includes a body comprising multiple fibers. The fibrous plugging device engages an opening in the well, and thereby seals off the opening. A method for use with a well can include flowing a fluid through the well, thereby conveying at least one fibrous plugging device including a body having multiple fibers, and the fibrous plugging device sealingly engaging an opening in the well, thereby substantially preventing flow through the opening.

FLOW CONTROL IN SUBTERRANEAN WELLS

A method of controlling flow in a subterranean well can include a device introduced into the well being conveyed by flow in the well, the device comprising a material selected from poly-vinyl alcohol, poly-vinyl acetate and/or poly-methacrylic acid. The material may degrade in the well. A system for use with a well can include a flow conveyed device conveyed through a tubular string by flow in the tubular string, and the flow conveyed device including a material selected from poly-vinyl alcohol, poly-vinyl acetate and/or poly-methacrylic acid. A flow conveyed device for use in a subterranean well can include a body and a degradable material extending outwardly from the body, the degradable material being formed as a film, tube or filament. 120-. (canceled)21. A flow conveyed device for use in a subterranean well , the device comprising:a body; anda degradable material extending outwardly from the body, the degradable material being formed as at least one of a film, tube, fabric and filament.22. The flow conveyed device of claim 21 , wherein the body is configured to engage an opening in a sidewall of a tubular string.23. The flow conveyed device of claim 21 , wherein the body comprises at least one knot.24. The flow conveyed device of claim 23 , wherein the knot is formed from the degradable material.25. The flow conveyed device of claim 21 , wherein the degradable material degrades in response to increased temperature in the well.26. The flow conveyed device of claim 21 , wherein the degradable material degrades in response to increased pH in the well.27. The flow conveyed device of claim 21 , wherein the degradable material is selected from the group consisting of poly-vinyl alcohol claim 21 , poly-vinyl acetate and poly-methacrylic acid.28. The flow conveyed device of claim 21 , wherein the body is retained by a retainer.29. The flow conveyed device of claim 28 , wherein the retainer comprises a material selected from the group consisting of poly-vinyl alcohol ...

FLOW CONTROL IN SUBTERRANEAN WELLS

A flow conveyed device for use in a well can include a body and a plurality of lines joined to the body, each of the lines having a lateral dimension that is substantially smaller than a size of the body, and each of the lines including fibers. A method of controlling flow in a well can include a device introduced into the well being conveyed by flow in the well, and the device including a plurality of lines extending outwardly from a body. Each of the lines may include fibers. A system for use with a well can include a flow conveyed device conveyed through a tubular string by flow in the tubular string, the flow conveyed device including a body with a plurality of lines extending outwardly from the body, the body including at least one knot. 1. A flow conveyed device for use in a subterranean well , the device comprising:a body; anda plurality of lines joined to the body, each of the lines having a lateral dimension that is substantially smaller than a size of the body, and each of the lines comprising fibers.2. The device of claim 1 , wherein the lines are retained by a retainer.3. The device of claim 2 , wherein the retainer degrades in response to passage of a predetermined period of time.4. The device of claim 2 , wherein the retainer degrades in response to exposure to a predetermined fluid.5. The device of claim 2 , wherein the retainer degrades in response to exposure to a predetermined chemical composition.6. The device of claim 2 , wherein the retainer degrades in response to exposure to a predetermined temperature.7. The device of claim 2 , wherein the retainer degrades in response to exposure to radiation.8. The device of claim 1 , wherein the lines comprise ropes.9. The device of claim 1 , wherein the body comprises at least one knot.10. The device of claim 1 , wherein the body comprises a degradable material.11. The device of claim 1 , wherein the fibers comprise a degradable material.1230-. (canceled) This application is a continuation-in-part of U.S. ...

FLOW CONTROL IN SUBTERRANEAN WELLS

A method of restoring flow through an opening in a well, the opening being blocked by a plugging device, can include conveying a well tool into the well, contacting the plugging device with the well tool, and permitting flow through the opening as a result of the contacting step. Another method of restoring flow through an opening blocked by a plugging device in a well can include conveying a well tool into the well, reducing pressure in the well with the well tool, and permitting flow through the opening as a result of the pressure reducing step. 115-. (canceled)16. A method of restoring flow through an opening blocked by a plugging device in a well , the method comprising:conveying a well tool into the well;reducing pressure in the well with the well tool; andpermitting flow through the opening as a result of the pressure reducing.17. The method of claim 16 , wherein the plugging device comprises a body that prevents flow through the opening prior to the pressure reducing.18. The method of claim 17 , wherein the body comprises a knot.19. The method of claim 17 , wherein the body comprises a degradable material.20. The method of claim 19 , wherein the degradable material is selected from the group consisting of poly-vinyl alcohol claim 19 , poly-vinyl acetate claim 19 , poly-methacrylic acid claim 19 , poly-lactic acid and poly-glycolic acid.21. The method of claim 17 , wherein the plugging device further comprises claim 17 , extending outwardly from the body claim 17 , at least one of the group consisting of fibers and lines.22. The method of claim 21 , wherein the at least one of the group consisting of fibers and lines extends through the opening prior to the pressure reducing.23. The method of claim 17 , wherein the plugging device further comprises claim 17 , extending outwardly from the body claim 17 , at least one of the group consisting of film claim 17 , tube claim 17 , filament claim 17 , fabric and sheet material.24. The method of claim 23 , wherein the ...

FLUID FLOW CONTROL DURING WELL TREATMENT

A method can include positioning a flow restrictor in a wellbore that penetrates a formation interval, then displacing the flow restrictor along the wellbore away from the surface, thereby permitting flow into an interval section from a wellbore section between the flow restrictor and the surface, blocking the flow from the wellbore section into the interval section, and displacing the flow restrictor away from the surface, thereby permitting flow from the wellbore section into another interval section farther along the wellbore from the surface. A system can include a flow restrictor that restricts flow through an annulus surrounding the flow restrictor, and plugging devices disposed in a wellbore section positioned between the flow restrictor and a surface of the well. Flow from the wellbore section into a formation interval section is permitted prior to being blocked by the plugging devices. 1. A method of treating a subterranean well , the method comprising:positioning a first flow restrictor in a wellbore that penetrates an interval of an earth formation;then displacing the first flow restrictor along the wellbore away from a surface of the well, thereby permitting flow into a first section of the interval from a section of the wellbore between the first flow restrictor and the surface;blocking the flow from the wellbore section into the first interval section; anddisplacing the first flow restrictor along the wellbore away from the surface of the well, thereby permitting unrestricted flow from the wellbore section into a second section of the interval,in which the second interval section is farther along the wellbore from the surface than the first interval section.2. The method of claim 1 , in which the permitting flow into the first section of the interval comprises the first flow restrictor restricting fluid flow from the wellbore section into the second interval section.3. The method of claim 2 , in which the blocking comprises plugging devices preventing ...

METHODS OF COMPLETING A WELL AND APPARATUS THEREFOR

A method can include conveying a dispensing tool through a wellbore, the dispensing tool including an enclosure containing plugging devices, and then opening the enclosure by cutting a material of the enclosure, thereby releasing the plugging devices from the enclosure into the wellbore at a downhole location. A dispensing tool can include a container having an enclosure therein, the enclosure including a flexible material that contains the plugging devices, and an end of the enclosure being secured to a member displaceable by an actuator. The enclosure material is cut in response to displacement of the member by the actuator. A plugging device can include at least one body configured to engage an opening in the well and block fluid flow through the opening, and multiple fibers including staple fibers or filaments formed into yarn. 19-. (canceled)10. A dispensing tool for dispensing plugging devices into a subterranean well , the dispensing tool comprising:a container having an enclosure therein, the enclosure comprising a flexible material that contains the plugging devices; andan end of the enclosure being secured to a member displaceable by an actuator, and in which the enclosure material is opened in response to displacement of the member by the actuator.11. The dispensing tool of claim 10 , in which an opposite end of the enclosure is secured against displacement relative to the container.12. The dispensing tool of claim 11 , in which a fastener extends through folds of the flexible material at the opposite end of the enclosure.13. The dispensing tool of claim 10 , in which the member comprises a closure member of a valve.14. The dispensing tool of claim 13 , in which the closure member comprises an inner sleeve claim 13 , and in which the valve comprises a sliding sleeve valve.15. The dispensing tool of claim 13 , in which the closure member has a closed position that prevents fluid communication between an exterior of the dispensing tool and an interior flow ...

Flow control in subterranean wells

A method for use with a subterranean well can include releasing flow conveyed plugging devices into the well, each of the plugging devices including a body and, extending outwardly from the body, at least one of lines and fibers, and the plugging devices blocking flow through respective openings in the well. Another method can include perforating a zone, releasing a set of flow conveyed plugging devices into the well, each of the plugging devices including a body and, extending outwardly from the body, at least one of lines and fibers, the set of plugging devices blocking flow through respective perforations in the zone, perforating another zone, releasing another set of the flow conveyed plugging devices into the well, and the second set of plugging devices blocking flow through respective perforations in the second zone.

PLUGGING DEVICES HAVING FILAMENTS COATED WITH SWELLABLE MATERIAL

A method of constructing a plugging device can include incorporating multiple filaments into the plugging device, and coating each individual filament with a swellable material. A plugging device for use in a subterranean well can include a body comprising multiple filaments, and a swellable material on each of the individual filaments. A system can include a plugging device conveyed by fluid flow into engagement with an opening, whereby the plugging device blocks flow through the opening. The plugging device can include multiple filaments, each of the multiple filaments being coated with a swellable material. The swellable material may seal against a surface of the opening. 1. A method of constructing a plugging device for use in a subterranean well , the method comprising:incorporating multiple filaments into the plugging device; andcoating each individual filament with a swellable material prior to forming a body of the plugging device.2. The method of claim 1 , in which the incorporating comprises incorporating the filaments into multiple strands of yarn.3. The method of claim 2 , in which the incorporating further comprises forming a twine with the multiple strands of yarn.4. The method of claim 3 , in which the coating comprises coating the filaments after the twine forming.5. The method of claim 3 , further comprising forming a knot in the twine.6. (canceled)7. The method of claim 1 , in which the swellable material comprises a water-swellable material.8. The method of claim 1 , in which the swellable material swells in the well.9. A plugging device for use in a subterranean well claim 1 , the plugging device comprising:a body comprising multiple filaments; anda coating of swellable material on each of the individual filaments.,in which the individual filaments are coated with the swellable material prior to forming the body.10. The plugging device of claim 9 , in which the swellable material comprises a water-swellable material.11. The plugging device of ...

FLOW CONTROL IN SUBTERRANEAN WELLS

A method of restoring flow through an opening in a well, the opening being blocked by a plugging device, can include conveying a well tool into the well, contacting the plugging device with the well tool, and permitting flow through the opening as a result of the contacting step. Another method of restoring flow through an opening blocked by a plugging device in a well can include conveying a well tool into the well, reducing pressure in the well with the well tool, and permitting flow through the opening as a result of the pressure reducing step. 1. A method of restoring flow through an opening blocked by a plugging device in a well , the method comprising:conveying a well tool into the well;contacting the plugging device with the well tool; andpermitting flow through the opening as a result of the contacting.2. The method of claim 1 , wherein the plugging device comprises a body that prevents flow through the opening prior to the contacting.3. The method of claim 2 , wherein the body comprises a knot.4. The method of claim 2 , wherein the body comprises a degradable material.5. The method of claim 2 , wherein the plugging device further comprises claim 2 , extending outwardly from the body claim 2 , at least one of the group consisting of fibers and lines.6. The method of claim 5 , wherein the at least one of the group consisting of fibers and lines extends through the opening prior to the contacting.7. The method of claim 5 , wherein the at least one of the group consisting of fibers and lines extends into a perforation prior to the contacting.8. The method of claim 2 , wherein the plugging device further comprises claim 2 , extending outwardly from the body claim 2 , at least one of the group consisting of film claim 2 , tube claim 2 , filament claim 2 , fabric and sheet material.9. The method of claim 8 , wherein the at least one of the group consisting of film claim 8 , tube claim 8 , filament claim 8 , fabric and sheet material extends through the opening ...

METHODS OF COMPLETING A WELL AND APPARATUS THEREFOR

A method can include conveying a dispensing tool through a wellbore, the dispensing tool including an enclosure containing plugging devices, and then opening the enclosure by cutting a material of the enclosure, thereby releasing the plugging devices from the enclosure into the wellbore at a downhole location. A dispensing tool can include a container having an enclosure therein, the enclosure including a flexible material that contains the plugging devices, and an end of the enclosure being secured to a member displaceable by an actuator. The enclosure material is cut in response to displacement of the member by the actuator. A plugging device can include at least one body configured to engage an opening in the well and block fluid flow through the opening, and multiple fibers including staple fibers or filaments formed into yarn. 1. A method of deploying plugging devices in a wellbore , the method comprising:conveying a dispensing tool through the wellbore, the dispensing tool including an enclosure containing the plugging devices; andthen opening the enclosure by piercing a material of the enclosure, thereby releasing the plugging devices from the enclosure into the wellbore at a downhole location.2. The method of claim 1 , in which the piercing comprises tearing the material of the enclosure.3. The method of claim 1 , in which the opening comprises displacing one end of the enclosure relative to an opposite end of the enclosure.4. The method of claim 3 , in which the displacing comprises displacing a member of a valve.5. The method of claim 4 , in which the valve member comprises an inner sleeve that selectively blocks flow through at least one port of the valve.6. The method of claim 1 , in which the releasing comprises producing fluid flow through a flow passage in communication with an interior of the enclosure.7. The method of claim 6 , in which the opening comprises opening a valve claim 6 , thereby permitting the fluid flow from an exterior of the ...

PLUGGING DEVICES AND DEPLOYMENT IN SUBTERRANEAN WELLS

A method can include deploying a plugging device into a well, the plugging device including a body, and an outer material enveloping the body and having a greater flexibility than a material of the body, and conveying the plugging device by fluid flow into engagement with the opening, the body preventing the plugging device from extruding through the opening, and the outer material blocking the fluid flow between the body and the opening. In another method, the plugging device can include at least two bodies, and a washer element connected between the bodies, the washer element being generally disk-shaped and comprising a hole, a line extending through the hole and connected to the bodies on respective opposite sides of the washer element, the washer element preventing the plugging device from being conveyed through the opening, and the washer element blocking the fluid flow through the opening. 111-. (canceled)12. A method of completing a well , the method comprising:conveying a bottom hole assembly into the well on a conveyance, the bottom hole assembly comprising at least one perforator;forming perforations in the well with the perforator;then displacing the bottom hole assembly further into the well, thereby extending the conveyance longitudinally across the first perforations; andthen flowing a stimulation fluid into the first perforations.13. The method of claim 12 , wherein the conveyance extends longitudinally across the first perforations during the stimulation fluid flowing.14. The method of claim 12 , wherein the conveyance comprises a wireline claim 12 , and wherein the wireline extends longitudinally across the first perforations during the stimulation fluid flowing.15. The method of claim 12 , further comprising plugging the first perforations claim 12 , displacing the bottom hole assembly to a desired position in the well claim 12 , forming second perforations at the desired position claim 12 , and flowing the stimulation fluid into the second ...

PLUGGING DEVICES AND DEPLOYMENT IN SUBTERRANEAN WELLS

A method can include deploying a plugging device into a well, the plugging device including a body, and an outer material enveloping the body and having a greater flexibility than a material of the body, and conveying the plugging device by fluid flow into engagement with the opening, the body preventing the plugging device from extruding through the opening, and the outer material blocking the fluid flow between the body and the opening. In another method, the plugging device can include at least two bodies, and a washer element connected between the bodies, the washer element being generally disk-shaped and comprising a hole, a line extending through the hole and connected to the bodies on respective opposite sides of the washer element, the washer element preventing the plugging device from being conveyed through the opening, and the washer element blocking the fluid flow through the opening. 117-. (canceled)18. A method of completing a well , the method comprising:perforating a first zone with a perforator of a bottom hole assembly in the well;fracturing the first zone;perforating a second zone; andfracturing the second zone,wherein the first zone perforating, the first zone fracturing, the second zone perforating and the second zone fracturing are performed without withdrawing the bottom hole assembly from the well.19. The method of claim 18 , wherein at least one of the first zone fracturing and the second zone fracturing is performed while the bottom hole assembly is positioned in the well.20. The method of claim 18 , further comprising conveying the bottom hole assembly into the well with a conveyance.21. The method of claim 20 , wherein the conveyance extends longitudinally across the first zone after the first zone perforating and during the second zone fracturing.22. The method of claim 20 , wherein the conveyance comprises a wireline.23. The method of claim 20 , wherein the conveying comprises displacing the bottom hole assembly by fluid flow through the ...

Cement Slurries With Salt-Tolerant Fluid Loss Additives And Methods Relating Thereto

A cement slurry suitable for use in the presence of high salt concentrations may include a base fluid and dry components that include: a cementitious material, a pozzolanic material, a salt additive, and a salt-tolerant fluid loss additive. The salt-tolerant fluid loss additive may be at least one of the following zwitterionic polymers: (1) a copolymer of at least one anionic monomer and at least one cationic monomer, (2) a copolymer of at least one anionic monomer, at least one cationic monomer, and at least one zwitterionic monomer, (3) a homopolymer of a zwitterionic monomer, or (4) a copolymer of at least one zwitterionic monomer. 1. A method comprising: wherein the at least one cationic monomer is selected from the group consisting of: [2-(methacryloyloxy)ethyl]trimethylammonium chloride, [3-(methacryloylamino)propyl]trimethylammonium chloride, [2-(acryloyloxy)ethyl]trimethylammonium chloride, [3-(acryloylamino)propyl]trimethylammonium chloride, [2-(methacryloyloxy)ethyl]dimethylamine hydrochloride, [3-(methacryloylamino)propyl]dimethylamine hydrochloride, [2-(acryloyloxy)ethyl]dimethylamine hydrochloride, [3-(acryloylamino)propyl]dimethylamine hydrochloride, a bromide salt thereof, a sulfate salt thereof, a methyl sulfate salt thereof, an ethyl sulfate salt thereof, and a nitrate salt thereof,', 'wherein the at least one anionic monomer is selected from the group consisting of: sodium 2-acrylamido-2-methylpropanesulfonate, 4-vinylbenzenesulfonic acid, sodium 4-vinylbenzenesulfonate, vinylsulfonic acid, sodium vinylsulfonate, allylsulfonic acid, sodium allylsulfonate, 3-sulfopropyl acrylate potassium salt, 3-sulfopropyl methacrylate potassium salt, N-sulfomethylacrylamide sodium salt, sodium 1-allyloxy-2-hydroxypropanesulphonate, a potassium salt thereof, a magnesium salt thereof, a calcium salt thereof, and an ammonium salt thereof, and', 'wherein the zwitterionic monomer is selected from the group consisting of: [3-(methacryloylamino)propyl]dimethyl(3- ...

PLUGGING DEVICE DEPLOYMENT

A method of deploying plugging devices in a well can include a spacing between the plugging devices by controlling a ratio flow rates through intersecting pipes. A deployment apparatus can include an actuator and a release structure that releases the plugging devices into a conduit connected to a tubular string in the well. Another method of deploying plugging devices in a well can include operating an actuator, thereby displacing a release structure, and the release structure releasing the plugging devices into the well in response to operating the actuator. Another deployment apparatus can include intersecting pipes and a valve that selectively permits and prevents displacement of the plugging devices through one of the pipes. 1. A method of deploying plugging devices in a well , the method comprising:operating an actuator, thereby displacing a release structure; andthe release structure releasing the plugging devices into the well in response to the operating.2. The method of claim 1 , further comprising controlling a rate of release of the plugging devices.3. The method of claim 2 , wherein the controlling is performed by controlling an operational speed of the actuator.4. The method of claim 2 , wherein the controlling is performed by automatically controlling the actuator claim 2 , thereby automatically controlling the rate of release of the plugging devices.5. The method of claim 1 , wherein the actuator rotates the release structure.6. The method of claim 1 , further comprising initiating degradation of the plugging devices.7. The method of claim 6 , wherein the initiating is performed by opening a frangible coating on retainers that retain the plugging devices.8. The method of claim 6 , wherein the initiating is performed by forcing the plugging devices through a restriction.9. The method of claim 6 , wherein the initiating is performed by damaging claim 6 , breaking or opening retainers that retain the plugging devices.10. The method of claim 1 , wherein ...

SYSTEMS AND METHODS FOR SEALING CASING TO A WELLBORE VIA LIGHT ACTIVATION

Activating a reaction of a sealant, such as cement, with a fiber optic cable, the reaction causing hardening of the sealant. The sealant may be used in wellbore cementing operations to cement a casing in a wellbore. The fiber optic cable may be deployed by attaching it to the outside of a casing during insertion into the wellbore. The activation of the sealant can be via thermal or optical initiation in order to causing a hydration reaction or polymerization. 1. A method comprising:arranging a sealant and a fiber optic cable proximate one another within a wellbore, the fiber optic cable having one or more optical fibers;activating a reaction of the sealant by the fiber optic cable resulting in curing of the sealant.2. The method of claim 1 , wherein the sealant is located in an annulus between a casing and an inner surface of a wellbore.3. The method of claim 1 , wherein the activation of the reaction occurs from light released from the fiber optic cable.4. The method of claim 1 , wherein the activation is a thermal initiation by the fiber optic cable.5. The method of claim 1 , wherein the fiber optic cable begins the activation of the reaction at a downhole portion of the sealant and continues in an uphole direction.6. The method of claim 1 , wherein the fiber optic cable heats at a temperature of at least 200° F.7. The method of claim 1 , wherein light is released from the fiber optic cable by micro-bends or macro-bends in the fiber optic cable.8. The method of claim 1 , wherein light is released from the fiber optic cable by shrinkage of the optical fiber.9. The method of claim 1 , wherein the reaction is a hydration reaction of the sealant.10. The method of claim 1 , wherein the sealant is cement.11. The method of claim 1 , wherein the sealant is resinous.12. The method of claim 1 , wherein the activation is an optical initiation from the fiber optic cable.13. The method of claim 1 , wherein the reaction is a photochemical reaction.14. The method of claim 1 , ...

METHODS FOR MITIGATING ANNULAR PRESSURE BUILDUP IN A WELLBORE USING MATERIALS HAVING A NEGATIVE COEFFICIENT OF THERMAL EXPANSION

Pressure buildup can be extremely problematic during subterranean operations when there is no effective way to vent or otherwise access one or more sealed annuli within a wellbore. This condition can compromise casing integrity and ultimately lead to failure of a well. Methods for mitigating annular pressure buildup can comprise: providing a wellbore containing an annular space having one or more annuli therein; selecting a pressure-mitigating material based upon one or more conditions present within the annular space, the pressure-mitigating material having a negative coefficient of thermal expansion; introducing the pressure-mitigating material into the annular space of the wellbore; sealing at least a portion of the annular space after introducing the pressure-mitigating material thereto; and subjecting the pressure-mitigating material to a temperature increase in the sealed portion of the annular space to decrease a volume occupied therein by the pressure-mitigating material. 1. A method comprising:providing a wellbore containing an annular space having one or more annuli therein;selecting a pressure-mitigating material based upon one or more conditions present within the annular space, the pressure-mitigating material having a negative coefficient of thermal expansion;introducing the pressure-mitigating material into the annular space of the wellbore;sealing at least a portion of the annular space after introducing the pressure-mitigating material thereto; andsubjecting the pressure-mitigating material to a temperature increase in the sealed portion of the annular space to decrease a volume occupied therein by the pressure-mitigating material.2. The method of claim 1 , wherein the pressure-mitigating material is introduced into the annular space in a drilling fluid while drilling the wellbore.3. The method of claim 1 , wherein the pressure-mitigating material is introduced into the annular space in a spacer fluid or a displacement fluid.4. The method of claim 1 ...

WELL OPERATIONS WITH GROUPED PARTICLE DIVERTER PLUG

A method can include deploying a diverter plug into a well, the diverter plug comprising a group of particles that are prevented from dispersing, flowing fluid, thereby conveying the diverter plug into engagement with a fluid passageway, the particles conforming to a shape of the fluid passageway as the diverter plug blocks fluid flow through the fluid passageway, and the particles being prevented from dispersing while the diverter plug blocks the fluid flow through the fluid passageway. The diverter plug can include a group of particles disposed within an outer enclosure. The particles in the enclosure can conform to a shape of the fluid passageway as the diverter plug blocks fluid flow through the fluid passageway. In another method, the enclosure can sealingly engage the fluid passageway while the particles remain disposed within the enclosure. 1. A method , comprising:deploying at least one diverter plug into a well, the diverter plug comprising a group of particles disposed within an outer enclosure;flowing fluid in the well, thereby conveying the diverter plug into engagement with a fluid passageway in the well; andthe particles in the enclosure conforming to a shape of the fluid passageway as the diverter plug blocks fluid flow through the fluid passageway.2. The method of claim 1 , further comprising the particles degrading in the well.3. The method of claim 1 , further comprising the enclosure degrading in the well.4. The method of claim 1 , in which claim 1 , during the deploying claim 1 , the particles are loose within the enclosure.5. The method of claim 1 , in which the conveying further comprises producing fluid drag on material extending outwardly from the diverter plug.6. The method of claim 5 , in which the material is selected from the group consisting of fiber claim 5 , line claim 5 , fabric claim 5 , sheet and ribbon.7. The method of claim 1 , further comprising the enclosure sealingly engaging the fluid passageway.8. The method of claim 7 , in ...

Pump roller head with pivoting rollers and spring arms

A roller assembly comprises a central section with a hub; a plurality of flexible arms coupled to the central section; a plurality of spring pins, one spring pin coupled to each of the plurality of flexible arms; a plurality of arms coupled to the central section such that each arm is capable of pivoting independently with respect to the central section; and a plurality of rollers, one roller coupled to each of the plurality of arms.

PLUGGING DEVICE DEPLOYMENT

A system for use with a subterranean well can include a deployment apparatus configured to deploy one or more plugging devices into a fluid flow. The plugging devices are conveyed into the well by the fluid flow. The deployment apparatus can include multiple queues, different numbers of the plugging devices being contained in respective different ones of the queues. A method of deploying plugging devices can include connecting multiple queues of the plugging devices to a conduit, and deploying the plugging devices from a selected combination of the queues into the conduit. In another system, each of the plugging devices may include a body, and lines or fibers extending outwardly from the body. 1. A system for use with a subterranean well , the system comprising:a deployment apparatus configured to deploy one or more plugging devices into a fluid flow, whereby the plugging devices are conveyed into the well by the fluid flow, andin which the deployment apparatus comprises multiple queues, different numbers of the plugging devices being contained in respective different ones of the queues.2. The system of claim 1 , in which a total number of the plugging devices contained in the queues is equal to 2−1 claim 1 , where n is a total number of the queues.3. The system of claim 1 , in which the queues are sequentially numbered (1 claim 1 , 2 claim 1 , 3 claim 1 , . . . claim 1 , n) claim 1 , where n is the sequential number of a respective one of the queues claim 1 , and in which the number of plugging devices in the respective one of the queues is equal to 2.4. The system of claim 1 , in which each queue is positioned between two valves claim 1 , at least one of the valves being remotely actuated.5. The system of claim 1 , in which a selected combination of the queues is opened to thereby release a desired total number of the plugging devices into the well.6. The system of claim 1 , in which the plugging devices in each queue are contained in a degradable cylinder.7. The ...

FLOW CONTROL IN SUBTERRANEAN WELLS

A flow conveyed plugging device for use in a well, the device can include a body, and one or more lines extending outwardly from the body, each of the lines having a lateral dimension that is substantially smaller than a size of the body. A method of plugging an opening in a well can include deploying at least one flow conveyed plugging device into the well, the flow conveyed plugging device including a body and, extending outwardly from the body, at least one of the group consisting of: a) one or more fibers and b) one or more lines, the flow conveyed plugging device being conveyed by flow in the well into sealing engagement with the opening. Another flow conveyed plugging device can include a body, and fibers extending outwardly from the body. The flow conveyed plugging device degrades and thereby permits flow through an opening in the well. 111-. (canceled)12. A method of plugging an opening in a subterranean well , the method comprising:deploying at least one flow conveyed plugging device into the well, the flow conveyed plugging device including a body and, extending outwardly from the body, at least one of the group consisting of: a) one or more fibers and b) one or more lines;the flow conveyed plugging device being conveyed by flow in the well into sealing engagement with the opening.13. The method of claim 12 , further comprising mechanically removing the plugging device from the opening in the well.14. The method of claim 12 , further comprising the plugging device degrading in the well.15. The method of claim 14 , wherein the plugging device degrades in response to at least one of the group consisting of: a) contact with a fluid in the well claim 14 , b) passage of time in the well and c) exposure to heat in the well.16. The method of claim 12 , further comprising a knot of the body blocking flow through the opening.17. The method of claim 12 , wherein a material of the lines is selected from the group consisting of film claim 12 , tube claim 12 , filament ...

FLOW CONTROL IN SUBTERRANEAN WELLS

A plugging device, well system and method. In one example, a wrap, band or other type of binding is utilized to secure together multiple fibers, tubes, filaments, films, fabrics or lines of the plugging device. In another example, fibers, tubes, filaments, films, fabrics or lines are fused, adhered or bonded to an outer surface of a body of the plugging device. In other examples, a material of the plugging device may become more rigid or swell in a well. A plugging device may comprise a body loosely enclosed in a bag, wrapper or other enclosure. 1. A plugging device for use in a subterranean well , the plugging device comprising:a body configured to engage and substantially block flow through a passageway in the well; andan enclosure containing the body, relative motion being permitted between the body and the enclosure.2. (canceled)3. The plugging device of claim 1 , in which shear stress is substantially unsupported in sliding contact between the body and the enclosure.4. The plugging device of claim 1 , in which the enclosure is not attached to the body.5. (canceled)6. The plugging device of claim 1 , in which the relative motion between the body and the enclosure is limited.78-. (canceled)9. The plugging device of claim 1 , in which the body comprises a material that degrades in the well.10. The plugging device of claim 1 , in which the enclosure comprises a material that degrades in the well.11. (canceled)12. The plugging device of claim 1 , in which the enclosure comprises a material in sheet form rolled about the body.13. The plugging device of claim 1 , in which the enclosure comprises a material in tubular form claim 1 , the body being received in the tubular form.14. The plugging device of claim 1 , in which the enclosure comprises a material with the body enclosed therein by stitching.15. The plugging device of claim 1 , in which the body is more rigid and more dense relative to the enclosure.16. A method of plugging a passageway claim 1 , the method ...

Parenteral Nutrition Formulation

The present disclosure relates to parenteral nutrition formulations, including ready-to-use parenteral nutrition formulations which are reconstituted from multi-chamber containers and amino acid formulations. More particularly, the present disclosure is directed to formulations comprising butyrate derivatives, specifically arginine butyrate, for use with adult or pediatric patients. The disclosure further provides for methods of reducing or preventing systemic and local inflammation of patients receiving parenteral nutrition, and methods of maintaining or ameliorating their systemic immunity and local immunity, as well as the patients' gut barrier functions.

METHODS OF COMPLETING A WELL AND APPARATUS THEREFOR

A system for use with a well can include a perforating assembly with at least one perforator, the perforating assembly conveyed through a wellbore with fluid flow through the wellbore, and plugging devices spaced apart from the perforating assembly in the wellbore, the plugging devices conveyed through the wellbore with the fluid flow. A method of deploying plugging devices in a wellbore can include conveying a perforating assembly including a dispensing tool through the wellbore, the dispensing tool including a container, and then releasing the plugging devices from the container into the wellbore at a downhole location. Another method of deploying plugging devices in a wellbore can include conveying the plugging devices through the wellbore with fluid flow through the wellbore, and conveying a perforating assembly through the wellbore while the plugging devices are being conveyed through the wellbore. 13-. (canceled)4. A system for use with a subterranean well , the system comprising:a perforating assembly including at least one perforator, the perforating assembly conveyed through a wellbore with fluid flow through the wellbore; andplugging devices spaced apart from the perforating assembly in the wellbore, the plugging devices conveyed through the wellbore with the fluid flow,wherein the plugging devices are released from a container of the perforating assembly,wherein the perforating assembly further includes an actuator configured to release the plugging devices from the container, andwherein each of the plugging devices comprises a body and, extending outwardly from the body, at least one of the group consisting of lines and fibers.5. The system of claim 4 , wherein the at least one of the group consisting of lines and fibers has a lateral dimension substantially less than a size of the body.6. The system of claim 4 , wherein the body of each of the plugging devices comprises a knot.713-. (canceled)14. A method of deploying plugging devices in a wellbore ...

METHODS OF COMPLETING A WELL AND APPARATUS THEREFOR

A system for use with a well can include a perforating assembly with at least one perforator, the perforating assembly conveyed through a wellbore with fluid flow through the wellbore, and plugging devices spaced apart from the perforating assembly in the wellbore, the plugging devices conveyed through the wellbore with the fluid flow. A method of deploying plugging devices in a wellbore can include conveying a perforating assembly including a dispensing tool through the wellbore, the dispensing tool including a container, and then releasing the plugging devices from the container into the wellbore at a downhole location. Another method of deploying plugging devices in a wellbore can include conveying the plugging devices through the wellbore with fluid flow through the wellbore, and conveying a perforating assembly through the wellbore while the plugging devices are being conveyed through the wellbore. 1. A system for use with a subterranean well , the system comprising:a perforating assembly including at least one perforator, the perforating assembly conveyed through a wellbore with fluid flow through the wellbore; andplugging devices spaced apart from the perforating assembly in the wellbore, the plugging devices conveyed through the wellbore with the fluid flow.2. The system of claim 1 , wherein the plugging devices are released from a container of the perforating assembly.3. The system of claim 2 , wherein the perforating assembly further includes an actuator configured to release the plugging devices from the container.4. The system of claim 3 , wherein each of the plugging devices comprises a body and claim 3 , extending outwardly from the body claim 3 , at least one of the group consisting of lines and fibers.5. The system of claim 4 , wherein the at least one of the group consisting of lines and fibers has a lateral dimension substantially less than a size of the body.6. The system of claim 4 , wherein the body of each of the plugging devices comprises a ...

METHOD FOR USING MANAGED PRESSURE DRILLING WITH EPOXY RESIN

A method of controlling the equivalent circulating density of an epoxy resin, used to cement a wellbore, is provided. The method includes adjusting the cross sectional area of the annulus exit using a valve or other mechanism to increase or decrease the equivalent circulating density of the epoxy resin. 1. A method for fixing a casing string in a wellbore in an underground formation having a pore pressure and a fracturing pressure , comprising:introducing an epoxy resin into an annulus defined by the casing string and an inner wall of the wellbore wherein the epoxy resin is at an annulus pressure within the annulus; and,exerting backpressure on the epoxy resin as it flows through the annulus such that the annulus pressure is between the pore pressure and the fracturing pressure.2. The method of claim 1 , wherein exerting backpressure on the epoxy resin is performed by adjusting the cross sectional area of an annulus exit using a valve.3. The method of claim 2 , wherein the valve is a choke valve.4. The method of claim 2 , wherein the valve is adjusted according to commands from a programmable logic controller.5. The method of claim 4 , wherein the programmable logic controller causes the choke valve to increase the cross sectional area of the annulus exit to maintain the pressure of the epoxy resin below the fracturing pressure and causes the choke valve to decrease the cross sectional area of the annulus exit to maintain the pressure of the epoxy resin above the pore pressure.6. The method of claim 5 , wherein the programmable logic controller is configured to implement a real time hydraulics model.7. The method of claim 6 , wherein the difference between the pore pressure and the fracturing pressure is less than about 0.5 pounds per gallon.8. The method of claim 1 , wherein the epoxy resin comprises barite claim 1 , silica claim 1 , hollow glass spheres or fly ash cenospheres.9. The method of claim 1 , wherein the epoxy resin is foamed with entrained gas.10. The ...

FIBROUS BARRIERS AND DEPLOYMENT IN SUBTERRANEAN WELLS

A fibrous plugging device for use in a subterranean well can include a body having fibers and a retainer material. The retainer material retains a shape of the body. A system for use with a well can include a fibrous plugging device conveyed by fluid flow in the well. The fibrous plugging device includes a body comprising multiple fibers. The fibrous plugging device engages an opening in the well, and thereby seals off the opening. A method for use with a well can include flowing a fluid through the well, thereby conveying at least one fibrous plugging device including a body having multiple fibers, and the fibrous plugging device sealingly engaging an opening in the well, thereby substantially preventing flow through the opening. 1. A fibrous plugging device for use in a subterranean well , the device comprising:a body including fibers and a retainer material, wherein the retainer material retains a shape of the body.2. The fibrous plugging device of claim 1 , wherein the fibers comprise a material selected from the group consisting of metal wool claim 1 , wire claim 1 , nylon 6 and nylon 66.3. The fibrous plugging device of claim 1 , wherein a melting point of a poly-lactic acid resin in each of the fibers decreases in an outward direction.4. The fibrous plugging device of claim 1 , wherein the fibers comprise a material selected from the group consisting of poly-lactic acid and poly-glycolic acid claim 1 , and wherein the fibers are in a form selected from the group consisting of a) a yarn claim 1 , b) monofilament claim 1 , c) multifilament and d) fabric.5. The fibrous plugging device of claim 1 , wherein the fibers are treated with a release agent that repels the retainer material.6. The fibrous plugging device of claim 5 , wherein the release agent comprises a water-wetting surfactant.7. The fibrous plugging device of claim 6 , wherein the water-wetting surfactant is selected from the group consisting of alkyl ether sulfate claim 6 , relatively high ...

FLOW CONTROL IN SUBTERRANEAN WELLS

A method of controlling flow in a subterranean well can include a device introduced into the well being conveyed by flow in the well, the device comprising a material selected from poly-vinyl alcohol, poly-vinyl acetate and/or poly-methacrylic acid. The material may degrade in the well. A system for use with a well can include a flow conveyed device conveyed through a tubular string by flow in the tubular string, and the flow conveyed device including a material selected from poly-vinyl alcohol, poly-vinyl acetate and/or poly-methacrylic acid. A flow conveyed device for use in a subterranean well can include a body and a degradable material extending outwardly from the body, the degradable material being formed as a film, tube or filament. 1. A method of controlling flow in a subterranean well , the method comprising:a device introduced into the well being conveyed by flow in the well, the device comprising a material selected from the group consisting of poly-vinyl alcohol, poly-vinyl acetate and poly-methacrylic acid.2. The method of claim 1 , further comprising the device engaging and preventing flow through an opening in the well.3. The method of claim 2 , wherein the opening comprises a perforation.4. The method of claim 1 , wherein the device comprises at least one knot.5. The method of claim 4 , wherein fibers of the material extend outwardly from the knot.6. The method of claim 4 , wherein the knot comprises a tube formed from the material.7. The method of claim 1 , further comprising the material degrading in the well.8. The method of claim 7 , wherein the device degrades in response to increased temperature in the well.9. The method of claim 7 , wherein the device degrades in response to increased pH in the well.10. The method of claim 1 , wherein the flow comprises an acid treatment.11. The method of claim 1 , wherein the device comprises a film claim 1 , tube claim 1 , fabric or filament formed from the material.12. A system for use with a well claim 1 , ...

FLOW CONTROL IN SUBTERRANEAN WELLS

A flow conveyed device for use in a well can include a body and a plurality of lines joined to the body, each of the lines having a lateral dimension that is substantially smaller than a size of the body, and each of the lines including fibers. A method of controlling flow in a well can include a device introduced into the well being conveyed by flow in the well, and the device including a plurality of lines extending outwardly from a body. Each of the lines may include fibers. A system for use with a well can include a flow conveyed device conveyed through a tubular string by flow in the tubular string, the flow conveyed device including a body with a plurality of lines extending outwardly from the body, the body including at least one knot. 1. A flow conveyed device for use in a subterranean well , the device comprising:a body; anda plurality of lines joined to the body, each of the lines having a lateral dimension that is substantially smaller than a size of the body, and each of the lines comprising fibers.2. The device of claim 1 , wherein the lines are retained by a retainer.3. The device of claim 2 , wherein the retainer degrades in response to passage of a predetermined period of time.4. The device of claim 2 , wherein the retainer degrades in response to exposure to a predetermined fluid.5. The device of claim 2 , wherein the retainer degrades in response to exposure to a predetermined chemical composition.6. The device of claim 2 , wherein the retainer degrades in response to exposure to a predetermined temperature.7. The device of claim 2 , wherein the retainer degrades in response to exposure to radiation.8. The device of claim 1 , wherein the lines comprise ropes.9. The device of claim 1 , wherein the body comprises at least one knot.10. The device of claim 1 , wherein the body comprises a degradable material.11. The device of claim 1 , wherein the fibers comprise a degradable material.12. A method of controlling flow in a subterranean well claim 1 , ...

FLOW CONTROL IN SUBTERRANEAN WELLS

A method of controlling flow in a well can include a device introduced into the well being conveyed by flow in the well, and the device having a plurality of fibers extending outwardly from a body, the fibers being retained by a retainer. A well system can include a flow conveyed device conveyed through a tubular string by flow in the tubular string, and the flow conveyed device including a body with a plurality of fibers extending outwardly from the body. A retainer can at least partially enclose the device. A flow conveyed device for use in a well can include a body, and a plurality of fibers joined to the body, each of the fibers having a lateral dimension that is substantially smaller than a size of the body. 1. A method of controlling flow in a subterranean well , the method comprising:a device introduced into the well being conveyed by flow in the well; andthe device comprising a plurality of fibers extending outwardly from a body, and a retainer retaining the fibers.2. The method of claim 1 , wherein the retainer comprises a degradable material.3. The method of claim 2 , wherein the material degrades between the device being introduced into the well and the device engaging an opening in the well.4. The method of claim 1 , wherein a material of the retainer melts in the well.5. The method of claim 1 , wherein a material of the retainer dissolves in the well.6. The method of claim 1 , wherein the body engages and prevents flow through an opening in the well.7. The method of claim 1 , wherein the fibers are joined together and form one or more lines extending outwardly from the body.8. The method of claim 7 , wherein the lines comprise one or more ropes.9. The method of claim 1 , wherein the body comprises at least one knot.10. The method of claim 1 , wherein the body comprises a degradable material.11. A system for use with a well claim 1 , the system comprising:a flow conveyed device conveyed through a tubular string by flow in the tubular string;the flow ...

PLUGGING DEVICE DEPLOYMENT IN SUBTERRANEAN WELLS

A method of releasing plugging devices into a wellbore can include conveying a dispensing tool to a desired downhole location in the wellbore, the dispensing tool including a container, and then releasing the plugging devices from the container into the wellbore at the downhole location. A plugging device dispensing system for use with a subterranean well can include a dispensing tool having a container configured for containing multiple plugging devices, and an actuator operable to release the plugging devices from the container at a downhole location in the well. 1. A method of releasing plugging devices into a subterranean well , the method comprising:conveying a dispensing tool to a desired downhole location in the well, the dispensing tool including a container, and each of the plugging devices comprising at least one outwardly extending line;then releasing the plugging devices from the container into the wellbore at the downhole location; andthen the plugging device lines degrading in the well.2. The method of claim 1 , wherein the releasing comprises operating an actuator of the dispensing tool.3. The method of claim 2 , wherein the operating comprises detonating at least one detonator.4. The method of claim 2 , wherein the operating comprises operating a motor.5. The method of claim 2 , wherein the operating comprises rotating an auger.6. The method of claim 2 , wherein the operating comprises displacing a barrier through a chamber in the container.7. The method of claim 2 , wherein the operating comprises operating a linear actuator.8. The method of claim 2 , wherein the operating comprises igniting a propellant.9. The method of claim 1 , further comprising connecting the dispensing tool between perforators.10. The method of claim 1 , further comprising connecting the dispensing tool between a perforator and a conveyance.11. The method of claim 1 , further comprising connecting a perforator between a conveyance and the dispensing tool.12. The method of ...

FLOW CONTROL IN SUBTERRANEAN WELLS

A flow conveyed plugging device for use in a well, the device can include a body, and one or more lines extending outwardly from the body, each of the lines having a lateral dimension that is substantially smaller than a size of the body. A method of plugging an opening in a well can include deploying at least one flow conveyed plugging device into the well, the flow conveyed plugging device including a body and, extending outwardly from the body, at least one of the group consisting of: a) one or more fibers and b) one or more lines, the flow conveyed plugging device being conveyed by flow in the well into sealing engagement with the opening. Another flow conveyed plugging device can include a body, and fibers extending outwardly from the body. The flow conveyed plugging device degrades and thereby permits flow through an opening in the well. 1. A flow conveyed plugging device for use in a subterranean well , the device comprising:a body; andone or more lines extending outwardly from the body, each of the lines having a lateral dimension that is substantially smaller than a size of the body.2. The flow conveyed plugging device of claim 1 , wherein a material of the one or more lines is selected from the group consisting of film claim 1 , tube claim 1 , filament claim 1 , fabric and sheet material.3. The flow conveyed plugging device of claim 1 , wherein the body and one or more lines are enclosed within a retainer.4. The flow conveyed plugging device of claim 3 , wherein the retainer comprises a liquid retainer material within an outer coating.5. The flow conveyed plugging device of claim 4 , wherein the outer coating comprises a flexible material.6. The flow conveyed plugging device of claim 4 , wherein the outer coating is degradable in the well.7. The flow conveyed plugging device of claim 1 , wherein the body comprises a material selected from the group consisting of poly-vinyl alcohol claim 1 , poly-vinyl acetate and poly-methacrylic acid.8. The flow conveyed ...

FLOW CONTROL IN SUBTERRANEAN WELLS

A method for use with a subterranean well can include releasing flow conveyed plugging devices into the well, each of the plugging devices including a body and, extending outwardly from the body, at least one of lines and fibers, and the plugging devices blocking flow through respective openings in the well. Another method can include perforating a zone, releasing a set of flow conveyed plugging devices into the well, each of the plugging devices including a body and, extending outwardly from the body, at least one of lines and fibers, the set of plugging devices blocking flow through respective perforations in the zone, perforating another zone, releasing another set of the flow conveyed plugging devices into the well, and the second set of plugging devices blocking flow through respective perforations in the second zone. 1. A method for use with a subterranean well , the method comprising:releasing flow conveyed plugging devices into the well, each of the plugging devices including a body and, extending outwardly from the body, at least one of the group consisting of lines and fibers; andthe plugging devices blocking flow through respective openings in the well.2. The method of claim 1 , further comprising flowing a treatment fluid into a first zone via the openings.3. The method of claim 2 , wherein the releasing is performed with the treatment fluid flowing.4. The method of claim 2 , wherein the releasing is performed after the treatment fluid flowing.5. The method of claim 2 , further comprising perforating the first zone prior to the treatment fluid flowing.6. The method of claim 2 , further comprising perforating a second zone after the blocking.7. The method of claim 6 , further comprising performing the releasing and treatment fluid flowing for the second zone.8. The method of claim 1 , further comprising setting a plug in the well prior to the releasing.9. The method of claim 8 , further comprising perforating a second zone after the setting.10. The method ...

PLUGGING DEVICE DEPLOYMENT IN SUBTERRANEAN WELLS

A method of releasing plugging devices into a wellbore can include conveying a dispensing tool to a desired downhole location in the wellbore, the dispensing tool including a container, and then releasing the plugging devices from the container into the wellbore at the downhole location. A plugging device dispensing system for use with a subterranean well can include a dispensing tool having a container configured for containing multiple plugging devices, and an actuator operable to release the plugging devices from the container at a downhole location in the well. 1. A method of releasing plugging devices into a wellbore , the method comprising:conveying a dispensing tool to a desired downhole location in the wellbore, the dispensing tool including a container; andthen releasing the plugging devices from the container into the wellbore at the downhole location.2. The method of claim 1 , wherein the releasing comprises operating an actuator of the dispensing tool.3. The method of claim 2 , wherein the operating comprises detonating at least one detonator.4. The method of claim 2 , wherein the operating comprises operating a motor.5. The method of claim 2 , wherein the operating comprises rotating an auger.6. The method of claim 2 , wherein the operating comprises displacing a barrier through a chamber in the container.7. The method of claim 2 , wherein the operating comprises operating a linear actuator.8. The method of claim 2 , wherein the operating comprises igniting a propellant.9. The method of claim 1 , further comprising connecting the dispensing tool between perforators.10. The method of claim 1 , further comprising connecting the dispensing tool between a perforator and a conveyance.11. The method of claim 1 , further comprising connecting a perforator between a conveyance and the dispensing tool.12. The method of claim 1 , wherein each of the plugging devices comprises a body and claim 1 , extending outwardly from the body claim 1 , at least one of the ...

METHOD OF TREATING AN INTERVAL VIA SELECTED PERFORATIONS/CLUSTERS IN A SUBTERRANEAN WELL

A well treatment method can include pumping a treatment fluid through a tubular in a well, deploying plugging devices into the tubular, and blocking flow of the treatment fluid through perforations formed through the tubular. At least one characteristic of the treatment fluid or the plugging devices is varied, thereby in the blocking flow step selectively blocking the flow of the treatment fluid through the perforations in a predetermined sequence. Another well treatment method can include varying at least one characteristic of perforations along an interval, thereby selectively blocking flow of a treatment fluid through the perforations in a predetermined sequence. Another well treatment method can include varying a CS ratio along an interval, thereby selectively blocking flow of a treatment fluid through perforations in a predetermined sequence. 1. A well treatment method , comprising:pumping a treatment fluid through a tubular in a well;deploying plugging devices into the tubular; andblocking flow of the treatment fluid through perforations formed through the tubular,in which at least one characteristic of the group consisting of the treatment fluid and the plugging devices is varied, thereby in the blocking flow step selectively blocking the flow of the treatment fluid through the perforations in a predetermined sequence.2. The well treatment method of claim 1 , in which the characteristic comprises a density of the treatment fluid.3. The well treatment method of claim 1 , in which the characteristic comprises a flow rate of the treatment fluid.4. The well treatment method of claim 1 , in which the characteristic comprises a rheological property of the treatment fluid.5. The well treatment method of claim 1 , in which the characteristic comprises a density of the plugging devices.6. The well treatment method of claim 1 , in which the characteristic comprises a buoyancy of the plugging devices in the treatment fluid.7. The well treatment method of claim 1 , in ...

FLOW CONTROL IN SUBTERRANEAN WELLS

A plugging device, well system and method. In one example, a wrap, band or other type of binding is utilized to secure together multiple fibers, tubes, filaments, films, fabrics or lines of the plugging device. In another example, fibers, tubes, filaments, films, fabrics or lines are fused, adhered or bonded to an outer surface of a body of the plugging device. In other examples, a material of the plugging device may become more rigid or swell in a well. A plugging device may comprise a body loosely enclosed in a bag, wrapper or other enclosure. 149-. (canceled)50. A plugging device , comprising:a body configured to engage and block flow through a passageway in a subterranean well.51. The plugging device of claim 50 , further comprising a wrap claim 50 , band or other type of binding to secure together multiple fibers claim 50 , tubes claim 50 , filaments claim 50 , films claim 50 , fabrics or lines.52. The plugging device of claim 51 , in which the binding provides structural support to the body of the plugging device claim 51 , or forms a part of the body.53. The plugging device of claim 51 , in which the binding prevents the plugging device from extruding through the passageway.54. The plugging device of claim 51 , in which the binding comprises heat or chemical fusing claim 51 , or glue claim 51 , adhesive or other type of bonding.55. The plugging device of claim 51 , in which a spherical body is molded or otherwise formed about the binding.56. The plugging device of claim 51 , in which one or more loop is formed from multiple fibers claim 51 , tubes claim 51 , filaments claim 51 , films claim 51 , fabrics or lines.57. The plugging device of claim 56 , in which the fibers extend in opposite directions from the binding.58. The plugging device of claim 56 , in which the binding secures the fibers claim 56 , tubes claim 56 , filaments claim 56 , films claim 56 , fabrics or lines together near a middle of the fibers' claim 56 , tubes' claim 56 , filaments' claim 56 ...

FLOW CONTROL IN SUBTERRANEAN WELLS

A flow conveyed plugging device for use in a well, the device can include a body, and one or more lines extending outwardly from the body, each of the lines having a lateral dimension that is substantially smaller than a size of the body. A method of plugging an opening in a well can include deploying at least one flow conveyed plugging device into the well, the flow conveyed plugging device including a body and, extending outwardly from the body, at least one of the group consisting of: a) one or more fibers and b) one or more lines, the flow conveyed plugging device being conveyed by flow in the well into sealing engagement with the opening. Another flow conveyed plugging device can include a body, and fibers extending outwardly from the body. The flow conveyed plugging device degrades and thereby permits flow through an opening in the well. 111-. (canceled)12. A method of plugging an opening in a subterranean well , the method comprising:deploying at least one flow conveyed plugging device into the well, the flow conveyed plugging device including a body and, extending outwardly from the body, at least one of the group consisting of: a) one or more fibers and b) one or more lines;the flow conveyed plugging device being conveyed by flow in the well into sealing engagement with the opening; andthe at least one of the group consisting of the one or more fibers and the one or more lines degrading in the well.13. The method of claim 12 , further comprising mechanically removing the plugging device from the opening in the well.14. The method of claim 12 , further comprising the plugging device degrading in the well.15. The method of claim 14 , wherein the plugging device degrades in response to at least one of the group consisting of: a) contact with a fluid in the well claim 14 , b) passage of time in the well and c) exposure to heat in the well.16. (canceled)17. The method of claim 12 , wherein the one or more lines extend outwardly from the body claim 12 , and ...

Peristaltic pump and cassette

A peristaltic pump having a molded flow channel contained on an elastomeric sheet that is bonded or mechanically attached to a rigid substrate. The pump head rollers are mounted radially from the axis of rotation of the pump motor and compress the elastomeric flow channels against the rigid substrate.

Surgical cassette having an aspiration pressure sensor

A cassette having a molded flow channel contained on an elastomeric sheet that is bonded or mechanically attached to a rigid substrate. The flow channel projects outwardly from the exterior of the cassette so that a peristaltic pump having pump head rollers mounted radially from the axis of rotation of the pump motor compress the elastomeric flow channels against the rigid substrate during operation.

Liquid venting surgical system

A surgical system having a cassette with an aspirant collection chamber and an aspiration exhaust line that drains into the aspirant collection chamber. A fluid line containing a valve allowing fluid from the irrigation fluid container to be vented into the aspirant collection chamber. A source of pressurized air is connected to the irrigation fluid container and is used to pressurize the fluid container. When the pressure within the fluid container needs to be increased, pressurized air from the pressurized air source is allowed to enter the fluid container. When the pressure within the fluid container needs to be decreased, irrigation fluid is allowed to be bled out of the fluid container and inter the collection chamber. In this manner, a direct fluidic connection with the gas contained within the fluid container does not need to be maintained.

Fluid pressure sensing chamber

A pressure sensing chamber having a tubing extension with a reduced diameter portion extending through the chamber. The tubing contains a plurality of ports so as to allow the purging of air from the chamber, but the ports are sized so that bubbles entering the tubing cannot easily flow into the chamber. The reduced diameter portion creates a pressure differential between the holes. This differential pressure creates flow through the chamber under high liquid flow and turbulent liquid flow events.

Multiple segmented peristaltic pump and cassette

In various embodiments, a surgical cassette, configured to engage peristaltic pump rollers, may include two or more pump segments between a sheet and a substrate coupled to the sheet. The two or more pump segments on the cassette may produce additional flow (e.g., approximately twice the flow for two segments as opposed to one) than if the cassette had only one pump segment engaging the roller. Further, in some embodiments, the two or more pump segments and rollers on the roller head may be configured to provide a flow profile in which a peak of a pulse from a first pump segment is at least partially out of phase with a peak of a pulse from the second pump segment. The combined resultant flow may then have a flow profile with pulsation amplitudes that are smaller than the individual pump segment pulsation amplitudes.

Multiple segmented peristaltic pump and cassette

In various embodiments, a surgical cassette, configured to engage peristaltic pump rollers, may include two or more pump segments between a sheet and a substrate coupled to the sheet. The two or more pump segments on the cassette may produce additional flow (e.g., approximately twice the flow for two segments as opposed to one) than if the cassette had only one pump segment engaging the roller. Further, in some embodiments, the two or more pump segments and rollers on the roller head may be configured to provide a flow profile in which a peak of a pulse from a first pump segment is at least partially out of phase with a peak of a pulse from the second pump segment. The combined resultant flow may then have a flow profile with pulsation amplitudes that are smaller than the individual pump segment pulsation amplitudes.

High affinity nucleic acid ligands containing modified nucleotides

Nucleic acid ligands containing modified nucleotides are described as are methods for producing such oligonucleotides. Such ligands enrich the chemical diversity of the candidate mixture for the SELEX process. Specific examples are provided of nucleic acids containing nucleotides modified at the 2'- and 5-position. Specific 2-OH and 2'-NH 2 modified RNA ligands to thrombin are described.

FLOW CONTROL IN SUBTERRANEAN WELLS

A flow conveyed plugging device for use in a well, the device can include a body, and one or more lines extending outwardly from the body, each of the lines having a lateral dimension that is substantially smaller than a size of the body. A method of plugging an opening in a well can include deploying at least one flow conveyed plugging device into the well, the flow conveyed plugging device including a body and, extending outwardly from the body, at least one of the group consisting of: a) one or more fibers and b) one or more lines, the flow conveyed plugging device being conveyed by flow in the well into sealing engagement with the opening. Another flow conveyed plugging device can include a body, and fibers extending outwardly from the body. The flow conveyed plugging device degrades and thereby permits flow through an opening in the well. 111-. (canceled)12. A method of plugging an opening in a subterranean well , the method comprising:deploying at least one flow conveyed plugging device into the well, the flow conveyed plugging device including a body and, extending outwardly from the body, at least one of the group consisting of: a) one or more fibers and b) one or more lines;the flow conveyed plugging device being conveyed by flow in the well into sealing engagement with the opening.13. The method of claim 12 , further comprising mechanically removing the plugging device from the opening in the well.14. The method of claim 12 , further comprising the plugging device degrading in the well.15. The method of claim 14 , wherein the plugging device degrades in response to at least one of the group consisting of: a) contact with a fluid in the well claim 14 , b) passage of time in the well and c) exposure to heat in the well.16. The method of claim 12 , further comprising a knot of the body blocking flow through the opening.17. The method of claim 12 , wherein a material of the lines is selected from the group consisting of film claim 12 , tube claim 12 , filament ...

Surgical cassette having an aspiration pressure sensor

A cassette having a molded flow channel contained on an elastomeric sheet that is bonded or mechanically attached to a rigid substrate. The flow channel projects outwardly from the exterior of the cassette so that a peristaltic pump having pump head rollers mounted radially from the axis of rotation of the pump motor compress the elastomeric flow channels against the rigid substrate during operation.

Peristaltic pump and cassette

A peristaltic pump having a molded flow channel contained on an elastomeric sheet that is bonded or mechanically attached to a rigid substrate. The pump head rollers are mounted radially from the axis of rotation of the pump motor and compress the elastomeric flow channels against the rigid substrate.

Surgical Cassette having a plurality of latching surfaces

A cassette having a molded flow channel contained on an elastomeric sheet that is bonded or mechanically attached to a rigid substrate. The flow channel projects outwardly from the exterior of the cassette so that a peristaltic pump having pump head rollers mounted radially from the axis of rotation of the pump motor compress the elastomeric flow channels against the rigid substrate during operation.

Peristaltic pump and cassette

Surgical cassette adapter

A self-contained adapter that is connected to a surgical console. The adapter contains all of the components necessary to allow different cassettes to be used with the surgical console.

Liquid venting surgical cassette

A surgical system having a cassette with an aspirant collection chamber and an aspiration vent line that draws fluid from the aspirant collection chamber. The pressure within the collection chamber is maintained near ambient so that when the aspiration vent line is open, fluid flows from the collection chamber and into the aspiration line. Such a system does not require a second source of irrigation fluid, minimizes pressure surges into the irrigation fluid line and does not affect the fluidic performance of the aspiration system. In addition, various vent pressures can be achieved by varying the vertical position of the reservoir relative to the aspiration line.

Liquid venting surgical system and cassette

A surgical system having a cassette with an aspirant collection chamber and an aspiration vent line that draws fluid from the aspirant collection chamber. The pressure within the collection chamber is maintained near ambient so that when the aspiration vent line is open, fluid flows from the collection chamber and into the aspiration line. Such a system does not require a second source of irrigation fluid, minimizes pressure surges into the irrigation fluid line and does not affect the fluidic performance of the aspiration system. In addition, various vent pressures can be achieved by varying the vertical position of the reservoir relative to the aspiration line.

Surgical cassette

A surgical system and cassette, the cassette having an identification method that is specific to the cassette. Suitable methods include bar coding or Radio Frequency Identification (“RFID”). Cassette information that may be encoded include features such as lot number and performance characteristics, such as pressure sensor calibration data, flow and pressure data and any other performance characteristics of the cassette captured during testing of the cassette at manufacture.

Method for data compression and encoding

A system and method for generating a calibration data curve, including communicating known calibration data for a microsurgical cassette to a surgical console with which the cassette will be used.

Method of Priming a Surgical System

A method of priming a surgical system that includes pulling a very high vacuum and then cycling fluid through the system as a fluid pulse. These steps can be repeated a number of times to help ensure that residual entrained air is removed from the system.

Conjunto para um sistema cirúrgico de facoemulsificação, e sistema de aspiração de calibre pequeno disposto para receber um fluido de aspiração

SISTEMAS E MÉTODOS PARA ASPIRAÇÃO DE CALIBRE PEQUENO. A presente invenção refere-se a um conjunto para um sistema cirúrgico de facoemulsificação que inclui um sistema de aspiração disposto para aspirar fluido a partir de um local cirúrgico. O sistema de aspiração inclui um percurso de aspiração na peça manual de facoemulsificação e inclui uma tubulação de aspiração de calibre pequeno flexível em comunicação de fluido com o percurso de aspiração. A tubulação de aspiração de calibre pequeno tem um diâmetro interno nominal menor do que em torno de 0,050 polegadas (1,27 mm) para redução dos níveis de aumento repentino de oclusão no sistema cirúrgico. Uma bomba peristáltica de saída alta se comunica com a tubulação de aspiração de calibre pequeno e é operável para a criação de um fluxo através da tubulação de aspiração de calibre pequeno.

Selectively moveable valve elements for aspiration and irrigation circuits

Various arrangements of fluidics systems are disclosed. In one arrangement, an aspiration circuit for a fluidics system is disclosed that selectively controls aspiration. The aspiration circuit comprises an aspiration line operatively connected to a surgical instrument, an aspiration exhaust line operatively connected to a waste receptacle; an aspiration vent line connected at a first end to the aspiration line; and a selectively variable vent valve operatively connected to the aspiration vent line. The variable vent valve may be selectively moved to vary aspiration pressure within the aspiration line. Other fluidics systems are disclosed that include a selectively positionable irrigation valve that may also be incorporated into a fluidics system that includes a variable vent valve.

Partial venting system for occlusion surge mitigation

A surgical system comprises a hand piece, an irrigation conduit in fluid communication with the hand piece to carry fluid toward a surgical site, an aspiration conduit in fluid communication with the hand piece to carry fluid away from the surgical site, a pump interfacing with the aspiration conduit, the pump to create a vacuum pressure in the aspiration conduit to draw fluid through the aspiration conduit, a vacuum relief valve in fluid communication with the aspiration conduit to relieve the vacuum pressure in the aspiration conduit, a pressure sensor to detect a pressure associated with the surgical site, a controller in communication with the vacuum relief valve and the pressure sensor to control the vacuum relief valve to decrease the vacuum pressure in the aspiration conduit when the pressure detected by the pressure sensor is less than a first pressure threshold.

Hydraulic pump for ophthalmic surgery

Apparatuses, systems, and method for hydraulic pumps are disclosed. Particularly, hydraulic pumps for ophthalmic surgical procedures are disclosed. Hydraulic pumps within the scope of the disclosure may include an aspiration pump. An example aspiration pump may include first and second hydraulic cylinders and a plurality of one-way valves that are operable to permit fluid flow into a first part of a hydraulic cylinder responsive to movement of a piston within the hydraulic cylinder in a first direction and operable to permit fluid to flow out of the hydraulic cylinder responsive to movement of the piston in a second direction opposite the first direction. The aspiration pump may be attached to a housing of a hand piece, or a portion of the aspiration pump may be received into the housing of the hand piece.

Liquid venting surgical cassette

A surgical system having a cassette with an aspirant collection chamber and an aspiration vent line that draws fluid from the aspirant collection chamber. The pressure within the collection chamber is maintained near ambient so that when the aspiration vent line is open, fluid flows from the collection chamber and into the aspiration line. Such a system does not require a second source of irrigation fluid, minimizes pressure surges into the irrigation fluid line and does not affect the fluidic performance of the aspiration system. In addition, various vent pressures can be achieved by varying the vertical position of the reservoir relative to the aspiration line.

Phacoemulsification Hand Piece With Integrated Aspiration Pump and Cartridge

An ophthalmic surgical hand piece comprises a driver coupled to a horn. The horn is coupled to a needle. An aspiration pump is integral with the hand piece and is located close to the needle. The aspiration pump comprises a motor coupled to a shaft. A removable cartridge comprises a length of flexible tubing held by a tubing holder. The length of flexible tubing is located between the shaft and the tubing holder. The removable cartridge comprises a section of an aspiration line.

Selectively moveable valve elements for aspiration and irrigation circuits

Various arrangements of fluidics systems are disclosed. In one arrangement, an aspiration circuit for a fluidics system is disclosed that selectively controls aspiration. The aspiration circuit comprises an aspiration line operatively connected to a surgical instrument, an aspiration exhaust line operatively connected to a waste receptacle; an aspiration vent line connected at a first end to the aspiration line; and a selectively variable vent valve operatively connected to the aspiration vent line. The variable vent valve may be selectively moved to vary aspiration pressure within the aspiration line. Other fluidics systems are disclosed that include a selectively positionable irrigation valve that may also be incorporated into a fluidics system that includes a variable vent valve.

Selectively moveable valve elements for aspiration and irrigation circuits

Selectively moveable valve elements for aspiration and irrigation circuits

Pressure control in phacoemulsification system

A surgical system comprises a pressurized irrigation fluid source; an aspiration pressure sensor associated with an aspiration line; and a controller for controlling the pressurized irrigation fluid source. The controller controls the pressurized irrigation fluid source based on a reading from the aspiration pressure sensor and an estimated flow value modified by a compensation factor.

Pressure control in phacoemulsification system

A surgical system comprises a pressurized irrigation fluid source; an irrigation line fluidly coupled to the pressurized irrigation fluid source; a hand piece fluidly coupled to the irrigation line; an irrigation pressure sensor located at or along the pressurized irrigation fluid source or irrigation line; and a controller for controlling the pressurized irrigation fluid source. The controller controls the pressurized irrigation fluid source based on a reading from the irrigation pressure sensor and an estimated flow value modified by a compensation factor.

Surgical cassette adapter

Surgical aspiration system

A surgical system having a cassette with an aspirant collection chamber and an aspiration exhaust line that drains into the aspirant collection chamber. A fluid line containing a valve allowing fluid from the irrigation fluid container to be vented into the aspirant collection chamber. A source of pressurized air is connected to the irrigation fluid container and is used to pressurize the fluid container. When the pressure within the fluid container needs to be increased, pressurized air from the pressurized air source is allowed to enter the fluid container. When the pressure within the fluid container needs to be decreased, irrigation fluid is allowed to be bled out of the fluid container and enter the collection chamber. In this manner, a direct fluidic connection with the gas contained within the fluid container does not need to be maintained.

Liquid venting surgical cassette

A cassette (14) for use with a surgical system, the cassette having an aspirant collection chamber (28) and an aspiration exhaust line (34) that drains into the aspirant collection chamber. A fluid line (44) containing a valve (46) allow fluid from the irrigation fluid container (32) to be vented into the aspirant collection chamber. A source of pressurized air (38) is connected to the irrigation fluid container and is used to pressurize the fluid container. When the pressure within the fluid container needs to be increased, pressurized air from the pressurized air source is allowed to enter the fluid container. When the pressure within the fluid container needs to be decreased, irrigation fluid is allowed to be bled out of the fluid container and enter the collection chamber. In this manner, a direct fluidic connection with the gas contained within the fluid container does not need to be maintained.

Peristaltic pump and cassette

A peristaltic pump having a molded flow channel contained on an elastomeric sheet that is bonded or mechanically attached to a rigid substrate. The pump head rollers are mounted radially from the axis of rotation of the pump motor and compress the elastomeric flow channels against the rigid substrate.

PERISTALTIC PUMP AND CASSETTE.

Cassette (18) para ser asociado operativamente con una bomba peristáltica, presentando el cassette un cuerpo relativamente rígido que define un sustrato exterior (22), comprendiendo la bomba unos medios de rodillo rotativos (12,14,16) adaptados para agarrar y pellizcar una porción de un canal para fluidos con paredes flexibles (26) contra el sustrato (22) de tal modo que empuja el fluido contenido en el mismo a lo largo del canal, caracterizado porque dicho canal para fluidos está formado entre dicho sustrato rígido exterior (22) y dicha lámina elastomérica (20) fijada al sustrato (22), presentando dicha lámina elastomérica por lo menos un canal (26) moldeado en su interior y contenido en el mismo, extendiéndose dicho canal o canales exteriormente desde el sustrato exterior (22). Cassette (18) to be operatively associated with a peristaltic pump, the cassette presenting a relatively rigid body defining an outer substrate (22), the pump comprising rotating roller means (12,14,16) adapted to grip and pinch a portion of a fluid channel with flexible walls (26) against the substrate (22) such that it pushes the fluid contained therein along the channel, characterized in that said fluid channel is formed between said outer rigid substrate (22 ) and said elastomeric sheet (20) fixed to the substrate (22), said elastomeric sheet having at least one channel (26) molded therein and contained therein, said channel or channels extending externally from the outer substrate (22) .

Peristaltic pump and cassette

Bomba peristaltica e cassete

Peristaltic pump and cartridge

Peristaltic pump and hose cassette

peristaltic pump and cartridge.

Systems and methods for small bore aspiration

An assembly for a phacoemulsification surgical system includes an aspiration system arranged to aspirate fluid from a surgical site. The aspiration system includes an aspiration path within the phacoemulsification hand piece and includes a flexible small bore aspiration tubing in fluid communication with the aspiration path. The small bore aspiration tubing has a nominal inner diameter smaller than about 0.050 inch to reduce levels of occlusion surge within the surgical system. A high-output, peristaltic pump communicates with the small bore aspiration tubing and is operable to create a flow through the small bore aspiration tubing.

Aspiration systems and methods with multiple pumps and pressure sensor

Systems and methods are disclosed for monitoring for an occlusion in an aspiration line during an ophthalmic surgical procedure. An ophthalmic surgical system may comprise a first aspiration pump located in a handpiece, a second aspiration pump located away from the handpiece such as in a console, and a pressure sensor located between the first aspiration pump and the second aspiration pump. The pressure sensor is adapted to monitor for an occlusion in the aspiration line upstream of the first aspiration pump. The second aspiration pump may be operated at the same flow rate as the first aspiration pump and/or to maintain a constant pressure between the second aspiration pump and the first aspiration pump. Systems and methods as disclosed allow for a handpiece pump located close to the working tip while providing reliable occlusion detection with a pressure sensor located away from the handpiece.

Pressure sensing in surgical console

A method of determining the accuracy of a pressure sensor (56) in a surgical console (12) is disclosed. The method involves actuating a linear actuator (18) so that its plunger (26) is linearly displaced a pre-defined amount, and measuring the force exerted by the plunger (26) on a non-compliant member. The accuracy of the linear actuator (18) and the plunger are determined by comparing the force measured in the measuring step to a pre-defined force.

Pressure sensing in surgical console

A method of determining the accuracy of a pressure sensor in a surgical console is disclosed. The method involves actuating a linear actuator so that its plunger is linearly displaced a pre-defined amount, and measuring the force exerted by the plunger on a non-compliant member. The accuracy of the linear actuator and the plunger are determined by comparing the force measured in the measuring step to a pre-defined force.

Peristaltic pump and cassette

A peristaltic pump and cassette assembly comprises a pump having a rotatable roller head (12,14,16) adapted to engage and pinch a portion of a flexibly walled fluid channel (26) contained in the cassette (18) and to be in operative association therewith to push fluid contained therein along the channel. The roller head (14) is attached to a rotatable shaft (24) and has one or more rollers (16) with longitudinal axes, the longitudinal axes of the rollers being generally normal to the axis of the shaft. The flexibly walled fluid channel is formed by at least one molded channel (26) defined in a flexible sheet (20) attached to a planar exterior substrate (22) on the cassette (18).

Peristaltic pump and cassette

A peristaltic pump having a molded flow channel contained on an elastomeric sheet that is bonded or mechanically attached to a rigid substrate. The pump head rollers are mounted radially from the axis of rotation of the pump motor and compress the elastomeric flow channels against the rigid substrate.

Peristaltic pump and hose cassette

Selectively moveable valve elements for aspiration and irrigation circuits

An aspiration circuit for a fluidics system (11) for selectively controlling aspiration, comprises an aspiration line (52) operatively connected to a surgical instrument (42), an aspiration exhaust line (54) operatively connected to a waste receptacle (58). The aspiration vent line (60) is connected at a first end to the aspiration line; a selectively variable vent valve (62) is operatively connected to the aspiration vent line, wherein the variable vent valve may be selectively moved to selectively change aspiration pressure within the aspiration line. An irrigation line (50) is operatively connected to the surgical instrument (42) and an irrigation pressure sensor is operatively connected to the irrigation line (50). An actuator is connected to the vent valve (62), wherein the irrigation pressure sensor and actuator are connected to a controller (40), which is operative to initiate the actuator to move the vent valve in response to predetermined pressure values detected by the irrigation pressure sensor to vary the aspiration pressure within the aspiration line. The vent valve (62) is a rotary valve that further comprises an input opening (68), an output opening (69) and a channel (66) that connects the input opening to the output opening. The vent valve (62) may be selectively rotated to selectively position the channel (66) in at least partial communication with the aspiration vent line (60).

Selectively moveable valve elements for aspiration and irrigation circuits

An aspiration circuit for a fluidics system (11) for selectively controlling aspiration, including an aspiration line (52) operatively connected to a surgical instrument; an aspiration pump to create an aspiration flow in the aspiration line; an aspiration exhaust line (54) operatively connected to the aspiration pump on one end and to a waste receptacle (58) on an opposing end; an aspiration vent line (60) connected at a first end to the aspiration line between the aspiration pump and the surgical instrument; and a selectively variable vent valve (62) operatively connected to the aspiration vent line (60), wherein the variable vent valve (62) may be selectively moved to selectively change aspiration pressure within the aspiration line; The aspiration circuit further includes an irrigation line (50) operatively connected to the surgical instrument (42); an irrigation pressure sensor (475) and an actuator, the irrigation pressure sensor being positioned to detect irrigation pressure in the irrigation line and the actuator being operatively connected to the vent valve; wherein the irrigation pressure sensor (475) and the actuator are connected to a controller, and wherein the controller (40) is operative to initiate the actuator to move the vent valve in response to pressure detected by the irrigation pressure sensor to vary the aspiration pressure within the aspiration line (52).