Biological treatment method of oilfield drilling waste

The invention relates to a biological treatment method of oilfield drilling waste. Specifically, microorganisms are utilized to degrade hydrocarbons pollutants in the drilling waste, so as to treat the oilfield drilling waste.

Method for recycling sodium formate products from coarse sodium formate of byproduct of polyhydric alcohol

The invention discloses a method for recycling sodium formate from coarse sodium formate of a byproduct of polyhydric alcohol and changing the crystal form of the sodium formate to produce a sodium formate product with high quality and free flow. The method comprises the following steps of: adding the coarse sodium formate of the byproduct of the polyhydric alcohol, water and active carbon in a reaction kettle, heating the mixture, stirring the mixture, decoloring the mixture and filtering a hot resulting product to obtain the sheet-shaped decolored coarse sodium formate; and adding the decolored coarse sodium formate in a pressure proof reaction kettle, adding aqueous solution of low-carbon chain alcohol, heating the mixture until the temperature of the mixture is above the boiling pointof the low-carbon chain alcohol, performing the changing crystal form treatment by pressurization, cooling the mixture to the normal pressure, and separating and air drying or drying the mixture to obtain ...

Unblocking agent for polymer gel profile control agent

The invention discloses an unblocking agent for a polymer gel profile control agent. The unblocking agent for the polymer gel profile control agent comprises hydrogen peroxide and industrial hydrochloric acid, has the advantages of temperature resistance, salt resistance, fast gel breaking and strong gel breaking capability and solves the problems of slow gel breaking and insufficient gel breaking of the traditional polymer unblocking agent. The gel breaking time of the unblocking agent for the polymer gel profile control agent is shorter than 2 hours, the tolerable temperature reaches 85 DEG C and the maximum mineralization degree (based on sodium chloride) is 40,000 mg/L (the solution is prepared based on sea water); and 15 weight percent of hydrogen peroxide and 15 weight percent of industrial hydrochloric acid or 7.5 weight percent of hydrogen peroxide and 22.5 weight percent of industrial hydrochloric acid are mixed respectively, and the blocking can be completely removed after 2 hours ...

Low-temperature low-density well cementing cement mortar

Synthesis of polymer oil well cement filtrate loss reduction additive and synthetic method thereof and application

The invention relates to a synthetic polymer oil well cement filtrate reducer and a synthetic method thereof. The synthetic method comprises the following steps: a) preparing a raw material aqueous solution containing a first monomer selecting from 2-acryamide-2-methyl propanesulfonic acid, vinyl sulfonic acid or methacrylic acid, a second monomer selecting from N, N- dimethylacrylamide, acrylamide or N, N-diethylacrylamide, a third monomer selecting from maleic anhydride, maleic acid or fumaric acid, and a first regulator selecting from sodium allylsulfonate, dodecyl mercaptan and methyl sodium allylsulfonate, wherein the weight portion ratio of the first monomer to the second monomer to the third monomer to the first regulator is 65 to 95 portions: 1 to 30 portions: 1 to 5 portions: 0.01 to 5 portions; and b) adding an initiator, and heating up the raw material aqueous solution to a reaction temperature so as to carry out the polyreaction on the raw material aqueous solution. The synthetic ...

Water-base carried non-active nitric acid acidification inhibitor

The invention discloses an acidified inhibitor of the water base with inactive nitric acid which is made up of the solid components and liquid components. The solid component includes: thiourea 20-40%, thiosulfate 8-25%, urotropine 40-70%, KI 2-5% and neopelex 2-10%; the liquid component is: aniline 50-80% and isopropanol 20-50%. The invention can reach that the corrosion speed does not exceed 10g/m2h and the inhibiting ratio is about 99% when the aim ground temperature is 90deg.C.

Low-temperature low-density well cementing cement mortar

This invention relates to a low temperature low density cement paste for well-cementation use. It is composed (by weight percentages) of: high strength cement 40.0-62.3%; water 29.1-35%; setting accelerator 0.1-0.6%; cement retarder 0.6-0.9%; filtering-loss-reducer 4.4-5.2%; dispersing agent 0.1-0.3%; stabilizing agent 0.1-0.3%; auxiliary weight reducing agent 2-20%. This inventive low temperature low density cement paste, compared with prior art low temperature foam cement paste, has advantages of: no need of special equipment used for pouring cement paste, utilization of ordinary well-cementation equipment with controllable setting time and simple operation procedures.

Novel emulsion organic resin selective plugging agent

The invention discloses a novel emulsion organic resin selective plugging agent, which comprises the following components: polyacrylamide, liquid organic resin, surfactant and curing agent. The novel emulsion organic resin selective plugging agent has the characteristics of temperature resistance, salt tolerance, stable emulsion system and good selective plugging performance, and solves the problems that the conventional plugging agent has poor selectivity and damages the stratum. The water plugging rate of the selective plugging agent is more than 90 percent; the oil plugging rate is less than 20 percent; the temperature resistance reaches 150 DEG C; the highest mineralization tolerance (based on sodium chloride) is 40,000 mg/L (seawater is taken as liquid preparation basis); and the suspension stabilizing time is more than 96 hours.

Sea water silicate drilling fluids

The invention discloses a seawater silicate drilling fluid which comprises fresh water bentonite slurry 25 parts, seawater 75 parts, filtration-loss-reducing agent 2.0 to 5.0 parts, potassium chloride 5 to 7 parts, lubricant 1 to 2 parts, stabilizer 2 to 4 parts, and weighting agent 65 to 70 parts. The drilling fluid has the advantages of (1) good fluidity; (2) good wall building property, low HTHP filtration loss equal to or less than 15 ml, and thin mud cake; (3) high contamination resistance and (3) high poor soil invasion resistance (up to 15%); (4) good inhibition and large cuttings roller recovery larger than 85%; and (5) high lubricity and low friction coefficient.

Water-base carried non-active nitric acid acidification inhibitor

The invention discloses an acidified inhibitor of the water base with inactive nitric acid which is made up of the solid components and liquid components. The solid component includes: thiourea 20-40%, thiosulfate 8-25%, urotropine 40-70%, KI 2-5% and neopelex 2-10%; the liquid component is: aniline 50-80% and isopropanol 20-50%. The invention can reach that the corrosion speed does not exceed 10g/m2h and the inhibiting ratio is about 99% when the aim ground temperature is 90deg.C.

Synthesis of polymer oil well cement filtrate loss reduction additive and synthetic method thereof and application

The invention relates to a synthetic polymer oil well cement filtrate reducer and a synthetic method thereof. The synthetic method comprises the following steps: a) preparing a raw material aqueous solution containing a first monomer selecting from 2-acryamide-2-methyl propanesulfonic acid, vinyl sulfonic acid or methacrylic acid, a second monomer selecting from N, N- dimethylacrylamide, acrylamide or N, N-diethylacrylamide, a third monomer selecting from maleic anhydride, maleic acid or fumaric acid, and a first regulator selecting from sodium allylsulfonate, dodecyl mercaptan and methyl sodium allylsulfonate, wherein the weight portion ratio of the first monomer to the second monomer to the third monomer to the first regulator is 65 to 95 portions: 1 to 30 portions: 1 to 5 portions: 0.01 to 5 portions; and b) adding an initiator, and heating up the raw material aqueous solution to a reaction temperature so as to carry out the polyreaction on the raw material aqueous solution. The synthetic ...

Countercurrent washing deoiling treatment method for oil-contained drilling cuttings

The invention discloses a countercurrent washing deoiling treatment method for oil-contained drilling cuttings, comprising the following steps of: adding a first detergent solvent to a solvent pot; sieving the oil-contained drilling cuttings through a vibration sieve to convey oversize materials to the first washing process by a screw conveyer; mixing and washing the oversize materials of the oil-contained drilling cuttings and a second detergent solvent in a first-level washer, and continuously flowing out the mixture to directly enter a first-level centrifuger to separate the drilling cuttings from oil; conveying the drill cuttings discharged from a solid-phase discharge outlet of the first-level centrifuger to the second washing process and conveying liquid phase discharged from a liquid-phase discharge outlet to a rectifying tower; conveying the drill cuttings discharged from the solid-phase discharge outlet of a second-level centrifuger to the third washing process and taking the liquid ...

Hydraulic driven in-situ air-keeping sampler for seabed sediment

Water-based carrying non-active nitric acid powder and manufacturing method thereof

The invention discloses a water-based carried inactive nitric powder and making method, which contains inactive nitric powder, wherein the exterior of the inactive nitric powder is cladded with coating material to dissolve in the organic solution without dissolving in the water. The making method comprises the following steps: 1. allocating fitful quantity of coating solution; using the coating material for fitful quantity of organic solution; 2. cladding the coating liquid on the exterior of inactive nitric powder through cladding machine. The invention can form coating material of the film on the surface of inactive nitric powder, which can squeeze inactive nitric powder into formation based on water base as carrier.

Sea water silicate drilling fluids

The invention discloses a seawater silicate drilling fluid which comprises fresh water bentonite slurry 25 parts, seawater 75 parts, filtration-loss-reducing agent 2.0 to 5.0 parts, potassium chloride 5 to 7 parts, lubricant 1 to 2 parts, stabilizer 2 to 4 parts, and weighting agent 65 to 70 parts. The drilling fluid has the advantages of (1) good fluidity; (2) good wall building property, low HTHP filtration loss equal to or less than 15 ml, and thin mud cake; (3) high contamination resistance and (3) high poor soil invasion resistance (up to 15%); (4) good inhibition and large cuttings roller recovery larger than 85%; and (5) high lubricity and low friction coefficient.

Oil-containing drilling-cutting countercurrent washing deoiling treatment device

The invention discloses an oil-containing drilling-cutting countercurrent washing deoiling treatment device which comprises: (a) a first-stage, a second-stage and a third-stage washing devices, wherein each stage washing device comprises a washer and a centrifugal machine, wherein the bottom of the washer is provided with a drilling cutting and solvent inlet, and the top thereof is provided with a washing liquid outlet; the centrifugal machine is connected with the washing liquid outlet of the washer; and the drilling cutting inlet of the first-stage washer is sequentially connected with a first-stage conveying device; (b) a return tank and a rectifying tower, wherein the return tank is connected with a condenser on the top; the bottom of the rectifying tower is connected with a reboiler; and an outlet on the top of the rectifying tower is connected with an inlet of a solvent tank by the condenser. Compared with the prior art, the device can wash oil-containing drilling-cutting for three ...

Novel salt-resistant gel selective water shutoff agent

The invention discloses a novel salt-resistant gel selective water shutoff agent. The agent mainly comprises the following components in percentage by weight: 0.54 to 0.64 percent of cationic polyacrylamide, 0.8 to 1.6 percent of cross-linking agent, 0.9 to 1.2 percent of phenol, 0.02 to 0.6 percent of regulator, 0 to 4 percent of NaCl and the balance of water. The novel salt-resistant gel selective water shutoff agent of the invention is a cross-linked polymer system which is temperature-resistant and salt-resistant, has adjustable gelation time and overcomes the problem of poor oily water selectivity in the conventional water shutoff technology. The water shutoff rate of the selective water shutoff agent is over 95 percent; the oil shutoff rate is below 30 percent; the temperature resistance is up to 85 DEG C; the mineralization resistance (counted by sodium chloride) is 40,000 mg/L (solution preparation is based on seawater) at most; and the gelation time is more than 96 hours.

Selective chemical water shutoff agent for gravel-packed well

The invention discloses a selective chemical water shutoff agent for a gravel-packed well, comprising 0.6-1.0% of polyacrylamide (PAM), 1.0-1.5% of lignosulfonate, 0.3-0.7% of crosslinking agent, 0.2-0.5% of gelation time regulator and the balance water by weight. The viscosity of the water shutoff agent before gelation is less than 100mPa.s, the gelation time is adjustable between 15hr and 70hr and the viscosity after gelation is more than 100000mPa.s; therefore, the water shutoff agent has strong water shutoff property. The water shutoff rate of the water shutoff agent is more than 90% and the oil shutoff rate is less than about 15%; therefore, the water shutoff agent has good selectivity.

Solid-liquid separation gel breaker for waste polysulfide drilling fluid and preparation method thereof

The invention relates to a solid-liquid separation gel breaker for waste polysulfide drilling fluid and a preparation method thereof. The solid-liquid separation gel breaker for waste polysulfide drilling fluid is prepared from the following steps of: a, adding 10 to 50 weight parts of ester substance selected from one or more of diethyl oxalate, dimethyl malenate and diethyl malonate and 20 to 70 weight parts of triethylamine into a reactor and raising the temperature to 80 DEG C under a continuously stirring condition; b, adding 10 to 20 weight parts of sodium potassium tartrate tetrahydrate and 3 to 10 weight parts of cyclopentane, raising the temperature to 120 DEG C, preserving heat at the temperature of 120 DEG C, heating for 6 hours and stopping heating; and c, when the temperaturein the reactor falls to be between 25 DEG C and 40 DEG C, taking a reactant out, washing with an alcohol organic solvent, filtering and drying.

Towing type navigation water sampler

It is a drag sailing water sampler with a dragged body, which has a dive pump on its middle and down part and a sensor on its middle and upper parts inside. The water-in mouth of the pipe is connected with the water-out mouth of the dive pump and the water-in mouth and water-out mouth are fixed together by use of catcher and the pipe sticks out of the drag body and the hanging hook upper end is fixed together with hook ring and nylon through steel cable and is located on the upper end of the water pipe. The wire and cable are located on one side of the water pipe through anti-water adhesive tape. The advantages in this invention are the following: first it can make water sample continuously with high intensity in sailing status; second to accurately control water sample depth and adjust sample depth when needed on real time; third to improve the sample efficiency and lower the investigate cost.

Stabilizing material, and preparation method and application thereof

The invention relates to a stabilizing material which is prepared from the following raw materials in parts by weight: 70-85 parts of sulfoaluminate cement, 5-15 parts of ordinary Portland cement, 5-10 parts of quicklime and 5-10 parts of core material. The core material is formed by mixing the following components in parts by weight: 2-5 parts of calcined ardealite powder, 0-2 parts of water-reducing agent and 2-8 parts of porous carrier. The invention also relates to a preparation method of the stabilizing material and application of the stabilizing material in treating well-drilling waste, making roadbed materials and making concrete pavement bricks.