Состав для удаления асфальтосмолопарафиновых отложений

Изобретение относится к нефтедобывающей промышленности, а именно к способам удаления и растворения асфальтосмолопарафиновых отложений - АСПО в призабойной зоне пласта (ПЗП), удаления с поверхности глубинного и устьевого нефтепромыслового оборудования, в резервуарах и нефтесборных коллекторах, магистральных нефтепроводах. Состав для удаления асфальтосмолопарафиновых отложений, содержащий гексан, неионогенное ПАВ и полярный неэлектролит, содержит в качестве неионогенного ПАВ - реагент ОП-10, в качестве полярного неэлектролита - изобутанол и дополнительно - гидроксид натрия - NaOH и О-ксилол при следующем соотношении компонентов, мас.%: гексан 65,0-80,0, реагент ОП-10 2,0-3,0, изобутанол 5,0-15,0, NaOH 0,08-0,12, О-ксилол 10,0-20,0. Технический результат - повышение растворяющей способности состава для удаления АСПО в осложненных условиях, расширение сырьевой базы, в том числе и с привлечением отходов нефтехимического производства. 3 пр., 3 ил.

СОСТАВ И СПОСОБ ПРИГОТОВЛЕНИЯ ТВЕРДОГО ПЕНООБРАЗОВАТЕЛЯ ДЛЯ УДАЛЕНИЯ ЖИДКОСТИ С ЗАБОЯ ГАЗОВЫХ И ГАЗОКОНДЕНСАТНЫХ СКВАЖИН

Изобретение относится к газодобывающей промышленности и может быть использовано для удаления водогазоконденсатной смеси с забоя газовых и газоконденсатных скважин. Технический результат - повышение пенообразующей способности, обеспечение эффективного удаления жидкости с забоя газовых и газоконденсатных скважин при различной минерализации скважинной жидкости, в широком диапазоне содержания углеводородной фазы, сохранение физико-химических свойств пенообразователя при повышенных температурах. Состав для приготовления твердого пенообразователя для удаления жидкости с забоя газовых и газоконденсатных скважин, содержащий поверхностно-активное вещество - ПАВ, мочевину, карбоксиметилцеллюлозу - КМЦ, в качестве ПАВ содержит МОРПЕН, представляющий собой смесь водо- и маслорастворимых алкилсульфатов и сульфоэтоксилатов натрия, при следующем соотношении компонентов, масс. %: МОРПЕН 24,9-28,4, мочевина 71,1-74,6, КМЦ 0,5-1,0. Способ приготовления твердого пенообразователя для удаления жидкости с забоя ...

Corrosion inhibitors

Cleaning compositions for oil and gas wells lines casings formations and equipment and methods of u se

STIMULATE FROM OEL AND GAS BOREHOLES WITH ESTERS OF PHOSPHORUS AS TENSID.

PROCEDURE FOR THE STIMULATION OF OIL PROMOTION PROBES.

Cleaning compositions for oil and gas wells, lines, casings, formations and equipment and methods of use

COMPOSITIONS AND METHODS FOR TREATMENT OF WELL BORE TAR

Of the many compositions and methods provided herein, one method includes a method comprising: contacting tar resident in a well bore with a treatment fluid comprising a styrene-acrylate polymer; and allowing the styrene-acrylate polymer to interact with the tar to at least partially reduce the tendency of the tar to adhere to a surface. Another method provided herein includes a method for treating tar sand comprising: contacting the tar sand with a treatment fluid comprising an aqueous fluid and a styrene-acrylate polymer, the tar sand comprising tar and sand; and allowing the styrene-acrylate polymers to interact with the tar to at least partially separate the tar from the sand.

ACIDIZING ASPHALTENIC OIL RESERVOIRS WITH ACIDS CONTAINING SALICYLIC ACID

COMPOSITIONS AND METHODS FOR TREATMENT OF RESIN IN WELL

Из многих композиций и способов, предложенных в настоящей работе, один способ включает способ, включающий приведение смолы, находящейся в скважине, в контакт со стабилизирующим смолу полимером, включающим по меньшей мере один полимер, выбранный из группы, включающей стироловый полимер, акрилатный полимер, стирол-акрилатный полимер и любую их комбинацию; предоставление стабилизирующему смолу полимеру возможности взаимодействовать со смолой так, чтобы, по меньшей мере частично, уменьшать тенденцию смолы прилипать к поверхности. Of the many compositions and methods proposed in this work, one method includes the method of bringing the resin in the well into contact with a resin stabilizing polymer, including at least one polymer selected from the group consisting of styrene polymer, acrylate polymer, styrene -acrylate polymer and any combination thereof; allowing the resin stabilizing polymer to interact with the resin so as to at least partially reduce the tendency of the resin to adhere to the surface.

Compositions for controlled release

Controlled release composition comprising particulate starch

A biodegradable controlled release composition comprises a particulate starch and at least one other chemical. The composition is preferably for use in oil wells and may contain gel breakers, surfactants, antifoaming agents and other chemicals with utility in oil well applications. The starch is preferably hydrophobically modified to form starch octylsuccinate. The starch may release the chemical at a selected temperature, preferably 60{C. A method of preparing the composition comprises blending the particulate starch and a chemical to form a mixture, and treating the mixture, for instance by vacuum batch thermal processing, roll compaction, fluid bed processing, spray drying or extrusion, to form a free-flowing, non-sticky powder whilst retaining the particulate nature of the starch. An incompatible mixture of at least two such compositions may be formed.

COPOLYMERS OF ACRYLIC ACID AND/OR METHACRYLIC ACID ESTERS AS FLOW IMPROVERS

ACIDIZING RESERVOIRS WHILE CHELATING IRON WITH SULFOSALICYLIC ACID

ANIONIC COMPOSITIONS FOR SLUDGE PREVENTION AND CONTROL DURING ACID STIMULATION OF HYDROCARBON WELLS

This invention relates to anionic compositions, containing an alkyl aryl sulfonic acid or salt thereof, a nonethoxylated glycol and an acetylenic alcohol in an alkyl alcohol solvent, that have proved effective for controlling sludge and emulsion formation during acid stimulation and treatment of hydrocarbon wells.

COMPOSITIONS AND METHODS FOR TREATMENT OF WELL BORE TAR

Of the many compositions and methods provided herein, one method includes a method comprising: contacting tar resident in a well bore with a tar stabilizing polymer comprising at least one polymer selected from the group consisting of a styrene polymer, an acrylate polymer, a styrene-acrylate polymer, and any combination thereof; and allowing the tar stabilizing polymer to interact with the tar to at least partially reduce the tendency of the tar to adhere to a surface.

Corrosion inhibitors

A method of preventing corrosion in pipelines comprising draining pipeline of all residual compounds, blowing through with nitrogen and rinsing with a corrosion inhibiting rinsing agent.

ЧИСТЯЩАЯ КОМПОЗИЦИЯ, СПОСОБ ОЧИСТКИ НЕФТЯНЫХ И ГАЗОВЫХ СКВАЖИН, ТРУБОПРОВОДОВ, ОБСАДНЫХ ТРУБ И ПРОДУКТИВНЫХ ПЛАСТОВ, СПОСОБ ВЫДЕЛЕНИЯ ИЗБЫТОЧНОЙ ВОДЫ, ОСАДКА ИЛИ ИХ ОБОИХ ИЗ ДОБЫТОЙ СЫРОЙ НЕФТИ И СПОСОБ ГИДРАВЛИЧЕСКОГО РАЗРЫВА ПЛАСТА

Изобретение относится к использованию композиций с высокими температурами воспламенения и низким давлением паров для нагнетания внутрь и нанесения покрытия для газовых и нефтяных скважин и окружающих, содержащих углеводороды продуктивных пластов для целей удаления накипи, парафинов, смолы и других вязких составляющих. Композиция содержит от около 40 до 99 мас.% смеси сложных алкиловых эфиров жирных кислот и от около 1 до 25 мас.%, по меньшей мере, одного из простых низших алкилгликолевых эфиров жирных кислот. Способ очистки заключается во введении указанной композиции в скважину, продуктивный пласт или оборудование. Способ выделения избыточной воды, осадка или их обоих из добытой сырой нефти заключается в добавлении к сырой нефти указанной композиции. Способ гидравлического разрыва предусматривает нагнетание в продуктивный пласт под давлением жидкости носителя - указанной композиции с гранулированным материалом, в качестве которого используют песок. Технический результат: увеличение потока ...

Compositions for controlled release

Compositions and methods for treatment of well bore tar

Of the many compositions and methods provided herein, one method includes a method comprising: contacting tar resident in a well bore with a tar stabilizing polymer comprising at least one polymer selected from the group consisting of a styrene polymer, an acrylate polymer, a styrene-acrylate polymer, and any combination thereof; and allowing the tar stabilizing polymer to interact with the tar to at least partially reduce the tendency of the tar to adhere to a surface.

PROCESS FOR STIMULATING PETROLEUM PRODUCTION WELLS

... of the disclosure Process for stimulating petroleum production wells by injecting, into the production well, a solution of higher aromatics (high-flash aromatics) which contains a mixture comprising 50-90% of an oxyalkylated C12-C22-mono- or -di-alkylamine or alkenylamine and 10 to 50% of a petroleum emulsion-breaker. In addition, the solution can also contain oxyalkylated alkylphenols, fatty acids and glycol ethers. This stimulation method produces an excellent influx of oil, a very high oil table and hence a significantly raised rate of production.

METHOD FOR SIMULTANEOUS REMOVAL OF ASPHALTENE, AND/OR PARAFFIN AND SCALE FROM PRODUCING OIL WELLS

A method for cleaning oil wells to increase the flow of oil thereof by use of a unique aqueous cleaning emulsion comprising of water, hydrocarbon solvent, detergent and mineral acid. This one step method provides for the simultaneously cleaning/removal of asphaltine and/or paraffin and scale. This method can be used alone or with the assistance of a wash tool which is a combination pressure and surge wash tool having a nipple assembly. A by-pass port is coupled to the nipple assembly and a diverter cup is coupled to the by- pass port. A plurality of pressure wash cups are positioned on the tool. A pressure wash port is located between the plurality of pressure wash cups and a pump shoe assembly is coupled to a bottom pressure wash cup.

Composição quìmica de liberação controlada biodegradável e método para preparar a mesma

Composition and process for the removal of asphaltenic containing organic deposits from surfaces

Removal of organic deposits from surfaces, particularly those deposits containing asphaltenic compounds, by the dissolution of the deposits in a solvent comprised of an aromatic hydrocarbon and an amine.

Process for treating pipe lines

Process for the stimulation of petroleum production

Process for stimulating petroleum production wells by injecting, into the production well, a solution of higher aromatics (high-flash aromatics) which contains a mixture comprising 50-90% of an oxyalkylated C12-C22-mono- or -di-alkylamine or alkenylamine and 10 to 50% of a petroleum emulsion-breaker. In addition, the solution can also contain oxyalkylated alkylphenols, fatty acids and glycol ethers. This stimulation method produces an excellent influx of oil, a very high oil table and hence a significantly raised rate of production.

СПОСОБ РАСТВОРЕНИЯ АСФАЛЬТЕНОВЫХ ОБРАЗОВАНИЙ

Изобретение относится к способам обработки нефтяных скважин, а также теплообменников и всего оборудования, используемого на стадии производства нефти, смесями для растворения и удаления асфальтеновых остатков. Способ заключается во введении в нефтяные скважины солюбилизирующей композиции, включающей (а) в основном углеводородную фракцию, состоящую из по меньшей мере 70%, предпочтительно по меньшей мере 80 вес.% ароматических и алкилароматических углеводородов, причем алкильная группа является С1-С4-группой, (б) фракцию, в основном состоящую из хинолина и изохинолина как таковых или алкилзамещенных, предпочтительно как таковых, причем алкильная группа является С1-С4-группой, причем весовое соотношение между фракциями (а) и (б) составляет 97,5/2,5 - 75/25, предпочтительно 97/3 - 90/10. Технический результат: более полное и быстрое растворение асфальтенов. 6 з.п.ф-лы, 3 табл.

СОСТАВ ПОЛИСАХАРИДНОЙ ЖИДКОСТИ ДЛЯ ГЛУШЕНИЯ И ПРОМЫВКИ СКВАЖИН И СПОСОБ ЕГО ПРИГОТОВЛЕНИЯ И ПРИМЕНЕНИЯ

Изобретение относится к нефтегазодобывающей промышленности, в частности к составам для глушения и промывки скважин. Состав полисахаридной жидкости для промывки скважин или промысловых трубопроводов или глушения скважин, полученный растворением биоцида «Биолан» в пресной или минерализованной воде, представленной преимущественно раствором одновалентных катионов, растворением и гидратацией в полученном растворе гуарового загустителя, последующим введением комплексного реагента Нефтенол УСП с перемешиванием до получения мицеллярной дисперсии, с последующим добавлением борного сшивающего агента СП-РД и перемешиванием до полного сшивания, при следующем соотношении компонентов, мас.%: гуаровый загуститель 0,2-1,0, указанный сшивающий агент 0,2-1,0, реагент Нефтенол УСП 6,0-10,0, биоцид «Биолан» 0,004-0,01, указанная вода - остальное. Способ промывки скважин и очистки интервала перфорации от асфальтосмолопарафиновых отложений в скважинах с аномально низким пластовым давлением, включающий закачку ...

ACIDIZING RESERVOIRS WHILE CHELATING IRON WITH SULFOSALICYLIC ACID

The acidizing of a reservoir, particularly one that contains an asphaltenic oil, is improved by using an aqueous solution of strong acid which contains enough sulfosalicylic acid to prevent the formation of ironasphaltenic solids.

COMPOSITIONS FOR TREATING A WELL PENETRATING A SUBTERRANEAN FORMATION AND USES THEREOF

Fluid producing wells may be treated with a water-in-oil emulsion for the removal or inhibition of unwanted solid particulates, including pipe dope, asphaltenes and paraffins. Such emulsions are of particular applicability in the displacement of oil base drilling muds and/or residues from such muds from producing wells. The water-in-oil emulsions may optionally contain a dispersing agent as well as a surfactant.

COMPOSITIONS FOR CONTROLLED RELEASE

The present invention relates to biodegradable chemical compositions wherein core substrates, particularly oil well chemicals, are adsorbed onto particulate starch, particularly granular starch, providing a stable, controlled release formulation suitable for use in oil field applications. The invention further relates to the process of preparing obtaining these compositions.

ЭФФЕКТИВНАЯ УГЛЕВОДОРОДНАЯ СМЕСЬ ДЛЯ УДАЛЕНИЯ АСФАЛЬТЕНОВ И СПОСОБ РАСТВОРЕНИЯ АСФАЛЬТЕНОВЫХ ФОРМИРОВАНИЙ

Изобретение относится к углеводородной смеси для растворения асфальтеновых осадков и способам обработки углеводородной смесью нефтяных скважин для удаления асфальтеновых отложений. Углеводородная смесь содержит насыщенные углеводороды, полиароматические соединения и алкилбензолы. Содержание компонентов выбирают на тройной диаграмме. Начальная точка кипения углеводородной смеси выше 150oC. Способ заключается во введении в скважины описываемой углеводородной смеси. Технический эффект: экономичность и безопасность состава, снижение времени растворения асфальтеновых отложений. 2 с. и 3 з.п. ф-лы, 7 табл., 1 ил.

ЭФФЕКТИВНАЯ УГЛЕВОДОРОДНАЯ СМЕСЬ ДЛЯ УДАЛЕНИЯ АСФАЛЬТЕНОВ, СПОСОБ РАСТВОРЕНИЯ АСФАЛЬТЕНОВЫХ ФОРМИРОВАНИЙ

Предлагается углеводородная композиция для растворения асфальтеновых осадков, присутствующих в нефтяных скважинах, которая состоит из насыщенных соединений, алкилбензолов и полиароматических соединений, а также способ растворения асфальтеновых формирований в нефтяных скважинах.

VERWENDUNG AUSGEWAEHLTER COPOLYMEREN DER ACRYL- UND/ODER METHACRYLSAEUREESTER ALS FLIESSVERBESSERER IN PARAFFINREICHEN ERDOELEN UND ERDOELFRAKTIONEN (II).

Controlled release composition comprising particulate starch

Cleaning compositions for oil and gas wells, lines, casings, formations and equipment and methods of use

COMPOSITIONS AND METHODS FOR TREATMENT OF WELL BORE TAR

Of the many compositions and methods provided herein, one method 5 includes a method comprising: contacting tar resident in a well bore with a tar stabilizing polymer comprising at least one polymer selected from the group consisting of a styrene polymer, an acrylate polymer, a styrene-acrylate polymer, and any combination thereof; and allowing the tar stabilizing polymer to interact with the tar to at least partially reduce the tendency of the tar to adhere to a surface. 26/10/15,dh-23193 - abstract - cdm.docx,2 ...

CLEANING COMPOSITIONS FOR OIL AND GAS WELLS, LINES, CASINGS,FORMATIONS AND EQUIPMENT AND METHODS OF USE

The use of high flash point, low vapor pressure compositions for injection into, and coating of, gas and oil wells and surrounding underground hydrocarbon bearing formations and processing equipment for the purpose of removing scale, paraffins, tars, and other viscous constituents. Treatment results in increased flow of gas and/or oil and decreased adhesion of soils and scale in all aspects of oil and gas recovery, including hydrocarbon bearing formations, casings, lines, and pumping equipment. The composition contains about 40 to 99 wt.% of a fatty acid alkyl ester blend and about 1 to 25 wt.% of at least one low er alkyl glycol ether.

METHODS AND COMPOSITIONS FOR REMOVING ASPHALTENIC AND PARAFFINIC CONTAINING DEPOSITS

METHODS AND COMPOSITIONS FOR REMOVING ASPHALTENIC AND PARAFFINIC CONTAINING DEPOSITS Asphaltenic and paraffinic containing deposits are removed by contacting the deposits with an aqueous dispersion of a hydrocarbon solvent, an amine and a nonionic alkylated aryl polyether alcohol.

Anionic Compositions for Sludge Prevention and Control During Acid Stimulation of Hydrocarbon Wells

Compositions and methods for treatment of well bore tar

Of the many compositions and methods provided herein, one example composition includes a treatment fluid comprising: an aqueous fluid; and a tar stabilizing polymer comprising at least one polymer selected from the group consisting of a styrene polymer, an acrylate polymer, a styrene-acrylate polymer, and any combination thereof.

Cleaning compositions for oil and gas wells, lines, casings, formations and equipment and methods of use

The use of high flash point, low vapor pressure compositions for injection into, and coating of, gas and oil wells and surrounding underground hydrocarbon bearing formations and processing equipment for the purpose of removing scale, paraffins, tars, and other viscous constituents. Treatment results in increased flow of gas and/or oil and decreased adhesion of soil and scale in all aspects of oil and gas recovery, including hydrocarbon bearing formations, casings, lines and pumping equipment. The composition contains about 40 to 99 wt. % of a fatty acid alkyl ester blend and about 1 to 25 wt. % of at least one lower alkyl glycol ether.

Stimulation of oil and gas wells with phosphate ester surfactants

КОМПОЗИЦИОННЫЙ МАТЕРИАЛ, СОДЕРЖАЩИЙ РЕАГЕНТ И/ИЛИ ИНДИКАТОР ДЛЯ ОБРАБОТКИ СКВАЖИНЫ, НАНЕСЕННЫЙ НА ТЕРМООБРАБОТАННУЮ ПОДЛОЖКУ С ЯДРОМ, ПОКРЫТЫМ ОКСИДОМ МЕТАЛЛА, И СПОСОБ ЕГО ИСПОЛЬЗОВАНИЯ

Изобретение относится к материалам, используемым при обработке скважин гидроразрывом. Композиционный материал для ввода реагента и/или индикатора для обработки скважины в пробуренный пласт подземной формации, характеризуется тем, что содержит термообработанную подложку, содержащую достаточно мощное ядро, предотвращающее закрытие трещиноватости на месте залегания в условиях продуктивного пласта, и оксид металла по меньшей мере частично нанесенный на ядро, причем площадь поверхности оксида металла термообработанной подложки составляет от 1 до 10 м2/г, диаметр термообработанной подложки составляет от 0,1 до 3 мм, и реагент и/или индикатор для обработки скважины, нанесенный на покрытие из оксида металла на термообработанной подложке. По другому варианту композиционный материал для ввода реагента и/или индикатора для обработки скважины в пробуренный пласт подземной формации характеризуется тем, что содержит термообработанную подложку, содержащую достаточно мощное ядро, предотвращающее закрытие ...

SILICATE-CONTAINING ADDITIVES FOR WELL BORE TREATMENTS AND ASSOCIATED METHODS

SILICATE-CONTAINING ADDITIVES FOR WELL BORE TREATMENTS AND ASSOCIATED METHODS

The present invention relates to methods and compositions for use in subterranean operations. More particularly, the present invention relates to additives comprising one or more silicates used to treat tar resident in a well bore, and methods of use. In one embodiment, the present invention provides a method of treating tar resident in a well bore comprising providing a tar-treating additive comprising one or more silicates introducing the tar- treating additive into the well bore; and allowing the tar-treating additive to react with the tar resident in the well bore so as to at least partially reduce the adhesiveness of the tar.

STIMULATION OF OIL AND GAS WELLS WITH PHOSPHATE ESTER SURFACTANTS

METHOD FOR SIMULTANEOUS REMOVAL OF ASPHALTINE, AND/OR PARAFFIN AND SCALE FROM PRODUCING OIL WELLS

A method for cleaning oil wells to increase the flow of oil thereof by use of a unique aqueous cleaning emulsion comprising of water, hydrocarbon solvent, detergent and mineral acid. This one step method provides for the simultaneously cleaning/removal of asphaltine and/or paraffin and scale. This method can be used alone or with the assistance of a wash tool which is a combination pressure and surge wash tool having a nipple assembly. A by-pass port is coupled to the nipple assembly and a diverter cup is coupled to the by- pass port. A plurality of pressure wash cups are positioned on the tool. A pressure wash port is located between the plurality of pressure wash cups and a pump shoe assembly is coupled to a bottom pressure wash cup.

METHODS AND COMPOSITIONS FOR REMOVING ASPHALTENIC AND PARAFFINIC CONTAINING DEPOSITS

COMPOSITIONS AND METHODS FOR TREATMENT OF WELL BORE TAR

Of the many compositions and methods provided herein, one method includes a method comprising: contacting tar resident in a well bore with a treatment fluid comprising a styrene-acrylate polymer; and allowing the styrene-acrylate polymer to interact with the tar to at least partially reduce the tendency of the tar to adhere to a surface. Another method provided herein includes a method for treating tar sand comprising: contacting the tar sand with a treatment fluid comprising an aqueous fluid and a styrene-acrylate polymer, the tar sand comprising tar and sand; and allowing the styrene-acrylate polymers to interact with the tar to at least partially separate the tar from the sand.

EFFECTIVE HYDROCARBON BLEND FOR REMOVING ASPHALTENES

... "EFFECTIVE HYDROCARBON BLEND FOR REMOVING ASPHALTENES" Particular hydrocarbon composition constituted by saturated species, alkylbenzenes and polyaromatics, useful for dissolving asphaltenic residues present in oil wells.

CLEANING COMPOSITIONS FOR OIL AND GAS WELLS, LINES, CASINGS, FORMATIONS AND EQUIPMENT AND METHODS OF USE

The use of high flash point, low vapor pressure compositions for injection into, and coating of, gas and oil wells and surrounding underground hydrocarbon bearing formations and processing equipment for the purpose of removing scale, paraffins, tars, and other viscous constituents. Treatment results in increased flow of gas and/or oil and decreased adhesion of soils and scale in all aspects of oil and gas recovery, including hydrocarbon bearing formations, casings, lines, and pumping equipment. The composition contains about 40 to 99 wt.% of a fatty acid alkyl ester blend and about 1 to 25 wt.% of at least one lower alkyl glycol ether.

OIL WELL TREATMENT COMPOSITION

Method and device to reduce asphaltene and paraffin accumulations in wells

An oil well capsule to reduce the paraffin and asphaltene which accumulate on the walls of the pipes which are used to bring the oil up from underground deposits, and a method of using said oil well capsule. An oil well capsule having a shell encapsulating a chemically active mass wherein said chemically active mass consists essentially of alkaline or alkaline earth metal.

Compositions and methods for treatment of well bore tar

Of the many compositions and methods provided herein, one method includes a method comprising: contacting tar resident in a well bore with a treatment fluid comprising a styrene-acrylate polymer; and allowing the styrene-acrylate polymer to interact with the tar to at least partially reduce the tendency of the tar to adhere to a surface. Another method provided herein includes a method for treating tar sand comprising: contacting the tar sand with a treatment fluid comprising an aqueous fluid and a styrene-acrylate polymer, the tar sand comprising tar and sand; and allowing the styrene-acrylate polymers to interact with the tar to at least partially separate the tar from the sand.

PROCESS FOR STIMULATING PETROLEUM PRODUCTION WELLS

REMOVING ASPHALTENIC AND PARAFFINIC DEPOSITS WITH AQUEOUS SURFACTANT AND AMINE

Compositions and methods for treatment of well bore tar

Of the many compositions and methods provided herein, one method includes a method comprising: contacting tar resident in a well bore with a tar stabilizing polymer comprising at least one polymer selected from the group consisting of a styrene polymer, an acrylate polymer, a styrene-acrylate polymer, and any combination thereof; and allowing the tar stabilizing polymer to interact with the tar to at least partially reduce the tendency of the tar to adhere to a surface.

OIL WELL TREATMENT COMPOSITION

Oil Well Treatment Composition Solvent compositions for dissolution of both asphaltene and paraffin petroleum based deposits are described. Solvent compositions comprising kerosene and alkyl phenols, preferably cresol, have been found most efficient in oil well cleaning applications. This efficiency can be enhanced by the addition of an alkylamine. Compositions containing other aliphatic hydrocarbon solvents and more than 3% by volume alkyl phenols also exhibit good solvent properties for petroleum deposits. Oil production can be enhanced following well treatment in accordance with the disclosed invention.

EFFECTIVE HYDROCARBON BLEND FOR REMOVING ASPHALTENES

Particular hydrocarbon composition constituted by saturated species, alkylbenzenes and polyaromatics, useful for dissolving asphaltenic residues present in oil wells.

COMPOSITION EFFECTIVE IN REMOVING ASPHALTENES

Process for the dissolution of asphaltene sediments in oil wells which consists in introducing a solubilizing composition for the above asphaltenes into the oil wells, characterized in that the solubilizing composition comprises: (a) a basically hydrocarbon fraction consisting of at least 70%, preferably at least 80% by weight, of aromatic and alkyl aromatic hydrocarbons, the alkyl group being from C1 to C4; (b) a fraction basically consisting of quinoline and isoquinoline as such or alkyl substituted, preferably as such, the alkyl group being from C1 to C4; the weight ratio between fraction (a) and (b) being from 97.5/2.5 to 75/25, preferably from 97/3 to 90/10.

COPOLYMERS OF (METH) ACRYLIC ACID ESTERS AS FLOW IMPROVERS IN OILS

Method of reducing the pour-point and improving the flowability of petroleum oil or a fraction thereof by adding thereto a flowability-improving quantity of at least one copolymer of (a) an acrylic acid ester, a methacrylic acid ester, or a mixture of an acrylic acid ester and a methacrylic acid ester, and (b) not more than 20 % by weight, based on the weight of the copolymer, of acrylic acid, methacrylic acid, or a mixture of acrylic acid and methacrylic acid, and wherein said esters in component (a) are esters of a C16 or higher alcohol or an alcohol mixture wherein at least 75% by weight thereof is one or more alcohols containing at least 16 carbon atoms; and the compositions resulting therefrom.

Method for simultaneous removal of asphaltene, and/or paraffin and scale from producing oil wells

A method for cleaning oil wells to increase the flow of oil thereof by use of a unique aqueous cleaning emulsion comprising of water, hydrocarbon solvent, and detergent. This one step method provides for the simultaneously cleaning/removal of asphaltene and/or paraffin and scale. This method can be used alone or with the assistance of a wash tool which is a combination pressure and surge wash tool having a nipple assembly. A by-pass port is coupled to the nipple assembly and a diverter cup is coupled to the by-pass port. A plurality of pressure wash cups are positioned on the tool. A pressure wash port is located between the plurality of pressure wash cups and a pump shoe assembly is coupled to a bottom pressure wash cup.

Acidizing asphaltenic oil reservoirs with acids containing salicylic acid

A reservoir which contains an asphaltenic oil can be acidized with an aqueous acid without causing a deposition of permeability impairing iron-asphaltene compounds by dissolving or dispersing an effective amount of salicylic acid within at least the first injected portion of the aqueous acid.

Process for removing asphaltenes in oil wells

Inhibiting corrosion in pipelines

Corrosion in pipelines is inhibited by rinsing used pipeline with a corrosion inhibiting rinsing agent to leave a corrosion inhibiting oily film. The rinsing agent may be biodegradable and comprise a mixture of one or more vegetable base oils, one or more emulsifiers and one or more corrosion inhibitors. Alkaline reserve and lime scale dispersant may also be present.

METHOD AND COMPOSITION FOR ENHANCING HYDROCARBON PRODUCTION FROM WELLS

A concentrate for use with an oil or water carrier for injection into a well to enhance production and a method of well treatment are disclosed. The five part concentrate contains xylene, an aliphatic hydrocarbon solvent such as kerosene, a non-ionic emulsifier, a non-ionic surfactant and an amphoteric detergent. The xylene and kerosene create a solvent hole in the materials restricting flow. The surfactant expands the holes while the detergent and emulsifier assist in dispersing the removed material to thereby stimulate production from the well. The injection of the concentrate and carrier mixture can take place during shut-in of the well or during continued production.

EFFECTIVE HYDROCARBON BLEND FOR REMOVING ASPHALTENES.

Method and solvent composition for stimulating the production of oil from a producing well

A method and solvent composition for removing viscous crude oil, waxes, asphaltenes and resin precipitates of petroleum origin from oil wells, flow lines and pore spaces of oil-bearing formations. The solvent composition is a mixture of about 45 to about 85 volume percent of a nornally liquid aliphatic hydrocarbon boiling in the range of about 120 DEG F. to about 550 DEG F., between about 5 to 45 volume percent of a normally liquid aromatic hydrocarbon, between about 0.5 to about 6 volume percent of an ether of an aliphatic polyhydric alcohol, and between about 1 to about 15 volume percent of a lower alkyl monohydric alcohol.

PROCESS FOR STIMULATING PETROLEUM PRODUCTION WELLS

COMPOSITION EFFECTIVE IN REMOVING ASPHALTENES

Process for the dissolution of asphaltene sediments in oil wells which consists in introducing a solubilizing composition for the above asphaltenes into the oil wells, characterized in that the solubilizing composition comprises: (a) a basically hydrocarbon fraction consisting of at least 70%, preferably at least 80% by weight, of aromatic and alkyl aromatic hydrocarbons, the alkyl group being from C1 to C4; (b) a fraction basically consisting of quinoline and isoquinoline as such or alkyl substituted, preferably as such, the alkyl group being from C1 to C4; the weight ratio between fraction (a) and (b) being from 97.5/2.5 to 75/25, preferably from 97/3 to 90/10.

VERWENDUNG VON ORGANISCHEN, FLUORCHEMISCHEN VERBINDUNGEN MIT OEL- UND WASSERABSTOSSENDEN GRUPPEN ALS VISKOSITAETSERNIEDRIGENDE MITTEL IN ASPHALTENISCHEN ROHOELEN.

REMOVAL OF ASPHALTENE DEPOSITIONS WITH AMINE- ACTIVATED DISULFIDE OIL

STIMULATION OF OIL AND GAS WELLS WITH PHOSPHATE ESTER SURFACTANTS

STIMULATION OF OIL AND GAS WELLS WITH PHOSPHATE ESTER SURFACTANTS Crude oil and gas production wells, which no longer produce oil or gas utilizing conventional primary and secondary means of recovery, can be returned to production by treatment comprising addition of a non-aqueous solution of certain phosphate ester surfactants followed by successive treatment with water or a hydrocarbon. Increased production also can be obtained in low-produ-cing oil and gas wells by similar treatment with certain phosphate ester surfactants. Subsequent to treatment of a producer well, the phosphate ester surfactant is forced into the formation utilizing water or a hydrocarbon and said surfactant is allowed to remain in the producing well, for an effective period of at least 12 hours. Thereafter, pumping and/or conventional fluid drive means are then utilized to recover oil or gas from the subterranean oil or gas formation. The amount of non-aqueous surfactant solution utilized is sufficient to permeate ...

REMOVAL OF ASPHALTENE DEPOSITIONS WITH AMINE- ACTIVATED DISULFIDE OIL

A method for treating and removing unwanted asphaltene deposits from oil and gas wells, surface equipment, flow lines, and pore spaces of oil-bearing formations comprises treatment with an amine-activated aliphatic disulfide oil as an asphaltene solvent. In a preferred aspect, the aliphatic disulfide oil is a dialkyl disulfide oil and is activated by the addition of 10 weight percent of diethylamine. In a specific use, the activated disulfide oil is used to remove asphaltene deposits from an oil-bearing formation and a producing well penetrating the formation. 82057ART0178 ...

ACIDIZING ASPHALTENIC OIL RESERVOIRS WITH ACIDS CONTAINING SALICYLIC ACID

A reservoir which contains an asphaltenio oil can be acidized with an aqueous acid without causing a deposition of permeability impairing iron-asphaltene compounds by dissolving or dispersing an effective amount of salicylio acid at least the first injected portion of the aqueous acid.

Silicate-containing additives for well bore treatments and associated methods

The present invention relates to methods and compositions for use in subterranean operations. More particularly, the present invention relates to additives comprising one or more silicates used to treat tar resident in a well bore, and methods of use. In one embodiment, the present invention provides a method of treating tar resident in a well bore comprising providing a tar-treating additive comprising one or more silicates introducing the tar-treating additive into the well bore; and allowing the tar-treating additive to react with the tar resident in the well bore so as to at least partially reduce the adhesiveness of the tar.

Method and composition for enhancing hydrocarbon production from wells

A concentrate for use with an oil or water carrier for injection into a well to enhance production and a method of well treatment are disclosed. The five part concentrate contains xylene, an aliphatic hydrocarbon solvent such as kerosene, a non-ionic emulsifier, a non-ionic surfactant and an amphoteric detergent. The xylene and kerosene create a solvent hole in the materials restricting flow. The surfactant expands the holes while the detergent and emulsifier assist in dispersing the removed material to thereby stimulate production from the well. The injection of the concentrate and carrier mixture can take place during shut-in of the well or during continued production.

Corrosion inhibitors

A method of preventing corrosion in pipelines comprising draining pipeline of all residual compounds, blowing through with nitrogen and rinsing with a corrosion inhibiting rinsing agent.

REMOVING ASPHALTENIC AND PARAFFINIC DEPOSITS WITH AQUEOUS SURFACTANT AND AMINE

Stimulation of oil and gas wells with phosphate ester surfactants

Crude oil and gas production wells, which no longer produce oil or gas utilizing conventional primary and secondary means of recovery, can be returned to production by treatment comprising addition of a non-aqueous solution of certain phosphate ester surfactants followed by successive treatment with water or a hydrocarbon. Increased production also can be obtained in low-producing oil and gas wells by similar treatment with certain phosphate ester surfactants. Subsequent to treatment of a producer well, the phosphate ester surfactant is forced into the formation utilizing water or a hydrocarbon and said surfactant is allowed to remain in the producing weld, for an effective period of at least 12 hours. Thereafter, pumping and/or conventional fluid drive means are then utilized to recover oil or gas from the subterranean oil or gas formation.

Use of selected acrylic and/or methacrylic acid ester copolymers as flow enhancers in paraffin-rich mineral oils and mineral-oil fractions (II)

The use of copolymers of acrylic and/or methacrylic acid esters of higher alcohols or alcohol cuts having at least 16 C atoms in the alcohol radical and not more than 20% by weight, preferably about 0.5 to 15% by weight, of free acrylic acid and/or methacrylic acid - the per cent by weight relating to the copolymer weight - as additives for crude oils and petroleum fractions containing paraffins and/or asphaltenes for depressing the pour point or solidification point thereof and for improving the flow properties, especially in the temperature range just above the solidification point, is described. The flow enhancers are preferably used in paraffin-rich oils or oil fractions having normal pour points above 20°C, especially above 25°C, a depression of the pour points to values below 15°C and especially below 10°C becoming possible.

Corrosion inhibitors

METHOD FOR REMOVAL OF ASPHALTENE, PARAFFIN AND/OR SCALE FROM PRODUCING WELLS

A method for cleaning oil wells to increase the flow of oil thereof by use of a unique aqueous cleaning emulsion comprising of water, hydrocarbon solvent, detergent and mineral acid. This one step method provides for the simultaneously cleaning/removal of asphaltine and/or paraffin and scale. This method can be used alone or with the assistance of a wash tool which is a combination pressure and surge wash tool having a nipple assembly. A by-pass port is coupled to the nipple assembly and a diverter cup is coupled to the by-pass port. A plurality of pressure wash cups are positioned on the tool. A pressure wash port is located between the plurality of pressure wash cups and a pump shoe assembly is coupled to a bottom pressure wash cup.

Use of organic fluorochemical compounds with oleophobic and hydrophobic groups in asphaltenic crude oils as viscosity reducing agents

A method of reducing a viscosity of asphaltenic crude oils by incorporating into said crude oil an effective viscosity reducing amount of an oil soluble organic compound having at least one oleophobic and hydrophobic fluoroaliphatic group, and optionally a low viscosity diluent, and compositions thereof.

Method and device to reduce asphaltene and paraffin accumulations in wells

An oil well capsule to reduce the paraffin and asphaltene which accumulate on the walls of the pipes which are used to bring the oil up from underground deposits, and a method of using the oil well capsule. An oil well capsule having a shell encapsulating a chemically active mass wherein the chemically active mass consists essentially of alkaline or alkaline earth metal.

Compositions and Methods for Treatment of Well Bore Tar

Of the many compositions and methods provided herein, one method includes a method comprising: contacting tar resident in a well bore with a treatment fluid comprising a styrene-acrylate polymer; and allowing the styrene-acrylate polymer to interact with the tar to at least partially reduce the tendency of the tar to adhere to a surface. Another method provided herein includes a method for treating tar sand comprising: contacting the tar sand with a treatment fluid comprising an aqueous fluid and a styrene-acrylate polymer, the tar sand comprising tar and sand; and allowing the styrene-acrylate polymers to interact with the tar to at least partially separate the tar from the sand.

Corrosion inhibitors

A method of preventing corrosion in pipelines comprising draining pipeline of all residual compounds, blowing through with nitrogen and rinsing with a corrosion inhibiting rinsing agent.

HYDROCARBON BLEND FOR DISSOLVING ASPHALTENE RESIDUE

PURPOSE: To improve the dissolving power and dissolving rate when an asphaltene residue present in an oil well is to be dissolved by preparing a hydrocarbon blend having a compsn. selected from a specified region in a ternary chart of satd. compds., alkylbenzenes and polyaromatic compds. CONSTITUTION: As for this hydrocarbon blend used to dissolve an asphaltene residue present in an oil well, a compd. selected from a specified triangular region in the ternary chart with the vertex A representing 100% of polyaromatic compds. with z<-6, vertex B representing 100% of polyaromatic compds., and the vertex C representing 100% of a alkylbenzene with z=-6. The specified region is defined by lines connecting the vertex A, the point representing 77% of aromatic compds. with z<-6 and 23% of satd. compds. on the side AB, and the point representing 55% of polyaromatic compds. on the side AC. The compsn. having >=150 deg.C initial boiling point is used. Or, the compsn. is selected from the region defined ...

COMPOSITIONS AND METHODS FOR TREATMENT OF WELL BORE TAR

Of the many compositions and methods provided herein, one method 5 includes a method comprising: contacting tar resident in a well bore with a tar stabilizing polymer comprising at least one polymer selected from the group consisting of a styrene polymer, an acrylate polymer, a styrene-acrylate polymer, and any combination thereof; and allowing the tar stabilizing polymer to interact with the tar to at least partially reduce the tendency of the tar to adhere to a surface. 26/10/15,dh-23193 - abstract - cdm.docx,2

CORROSION INHIBITOR

PURPOSE: A corrosion inhibitor is provided in which a biodegradable rinsing agent inhibiting corrosion is required since a product is used in the adjoining sea, and which prevents arbitrary severe damage on underwater organisms in case of outflow of the rinsing agent. CONSTITUTION: In a method for preventing corrosion of a pipeline comprising the steps of discharging all residual compounds from the pipeline; blowing nitrogen into the pipeline; and rinsing the pipeline with a rinsing agent, the corrosion preventing method is characterized in that the rinsing agent inhibits corrosion of the pipeline, wherein the rinsing agent is used in pipelines for exploration and development of oil well, the pipeline is a coiled steel tubing, wherein the pipeline is rinsed with a rinsing agent right after it is used. The rinsing agent comprises one or more oils and pacifier materials, wherein the one or more oils are an emulsifiable rinsing agent, the rinsing agent is biodegradable, the rinsing agent comprises ...

Well completion fluid

Well treating fluid

COPOLYMERS OF ACRYLIC ACID AND/OR METHACRYLIC ACID ESTERS AS FLOW IMPROVERS

Process for increasing the productivity of wells

Method for simultaneous removal of asphaltene, and /or paraffin and scale from producing oil wells

A method for cleaning oil wells to increase the flow of oil thereof by use of a unique aqueous cleaning emulsion comprising of water, hydrocarbon solvent, detergent and acid. This one step method provides for the simultaneously cleaning/removal of asphaltene and/or paraffin and scale. This method can be used alone or with the assistance of a wash tool which is a combination pressure and surge wash tool having a nipple assembly. A by-pass port is coupled to the nipple assembly and a diverter cup is coupled to the by-pass port. A plurality of pressure wash cups are positioned on the tool. A pressure wash port is located between the plurality of pressure wash cups and a pump shoe assembly is coupled to a bottom pressure wash cup.

ERHOEHTE OELGEWINNUNG DURCH CYCLISCHES EINSPRITZEN VON FLUORCHEMIKALIEN

Compositions for treating a well penetrating a subterranean formation and uses thereof

Fluid producing wells may be treated with a water-in-oil emulsion for the removal or inhibition of unwanted solid particulates, including pipe dope, asphaltenes and paraffins. Such emulsions are of particular applicability in the displacement of oil base drilling muds and/or residues from such muds from producing wells. The water-in-oil emulsions may optionally contain a dispersing agent as well as a surfactant.

Hydrocarbon recovery process

Hydrocarbons are recovered from subterranean formations by waterflooding. The method comprises passing an aqueous displacement fluid via an injection well through a porous and permeable sandstone formation to release oil and recovering said released oil from a production well spaced from said injection well, wherein (a) the sandstone formation comprises at least one mineral having a negative zeta potential under the formation conditions; (b) oil and connate water are present in the pores of the formation; and (c) the fraction of the divalent cation content of the said aqueous displacement fluid to the divalent cation content of said connate water is less than 1.

Method and apparatus to treat well stimulation fluids in-situ

A method and apparatus for the management of injection and production of well fluids in a subterranean well is described to optimize the use of stimulation fluids to enhance their compatibility with subterranean reservoirs and the surface environment and thereby reducing the damage said fluids induce in subterranean reservoirs and upon flow back to the surface reduce their damage to the environment is described. More specifically, this method is directed to the subterranean treatment of injection fluids.

Drag reduction of asphaltenic crude oils

A method of introducing a drag reducing polymer into a pipeline such that the friction loss associated with the turbulent flow though the pipeline is reduced by suppressing the growth of turbulent eddies. The drag reducing polymer is introduced into a liquid hydrocarbon having an asphaltene content of at least 3 weight percent and an API gravity of less than about 26° to thereby produce a treated liquid hydrocarbon. The treated liquid hydrocarbon does not have a viscosity less than the viscosity of the liquid hydrocarbon prior to treatment with the drag reducing polymer. Additionally, the drag reducing polymer is added to the liquid hydrocarbon in the range from about 0.1 to about 500 ppmw.

Drag reduction of asphaltenic crude oils

A method of preparing a drag reducing polymer wherein the drag reducing polymer is able to be injected into a pipeline, such that the friction loss associated with the turbulent flow through the pipeline is reduced by suppressing the growth of turbulent eddies. The drag reducing polymer is injected into a pipeline of liquid hydrocarbon hydrocarbon having an asphaltene content of at least 3 weight percent and an API gravity of less than about 26° to thereby produce a treated liquid hydrocarbon wherein the viscosity of the treated liquid hydrocarbon is not less than the viscosity of the liquid hydrocarbon prior to treatment with the drag reducing polymer. The drag reducing polymer has a solubility parameter within 4 MPa 1/2 of the solubility parameter of the liquid hydrocarbon. The drag reducing polymer is also added to the liquid hydrocarbon in the range from about 0.1 to about 500 ppmw.

In situ channelization method and system for increasing fracture conductivity

A method and system for increasing fracture conductivity. A treatment slurry stage has a continuous first solid particulate concentration and a discontinuous anchorant concentration between anchorant-rich substages and anchorant-lean substages within the treatment slurry stage.

Surfactant composition, and manufacturing method and application of same

This invention relates to a surfactant composition, production and use thereof in tertiary oil recovery. The present surfactant composition comprises a cationic surfactant and an anionic-nonionic surfactant, and exhibits significantly improved interfacial activity and stability as compared with the prior art. With the present surfactant composition, a flooding fluid composition for tertiary oil recovery with improved oil displacement efficiency and oil washing capability as compared with the prior art could be produced.

Surfactant formulation for release of underground fossil fluids

The present disclosure provides a surfactant formulation for use in treating and recovering fossil fluid from a subterranean formation. The surfactant formulation includes a primary surfactant, a formulation stability agent and injection water. The surfactant formulation may be injected into one or more injection wells located within the subterranean formation and fossil fluids can then be subsequently recovered from one or more producing wells

Use of hydroxyacid to reduce the localized corrosion potential of low dose hydrate inhibitors

Corrosion of metal conduits by hydrate inhibitor formulations, particularly localized corrosion, is mitigated when the hydrate inhibitor formulation contains an effective amount of at least one hydroxyacid or equivalent selected from the group consisting of hydroxyacids having 2 to 20 carbon atoms and at least one hydroxyl group. The hydrate inhibitor formulation has an absence of methanol, but may include other alcohol solvents, diol or triol solvents, aromatic solvents and ketone solvents.

Low temperature polymerization process

ABSTRACT OF THE INVENTION The hydrocarbon fluid friction reducing properties of copolymers of two or more alpha-monoolefins having 4 to 20 carbon atoms is improved by copolymerizing the monomers in the liquid state by means of a Ziegler catalyst at a temperature of about 0° C or lower.

Process for increasing molecular weight of vinylpyrrolidone polymer

The process for increasing the molecular weight of poly-N-vinylpyrrolidone over that normally obtained by suspension polymerization of N-vinylpyrrolidone in a saturated hydrocarbon suspension medium, by adding to the suspension medium a controlled amount of water, specifically an amount between about 1% and 35% by weight based on the total weight of N-vinylpyrrolidone monomer. The significantly higher molecular weight of the resulting polymeric product can be still further increased by additionally incorporating in the suspension medium between about 0.001 mol % and about 1 mol % of a difunctional vinyl cross-linking agent per mol of N-vinylpyrrolidone monomer. The polymeric products of the present invention are preferably water soluble granules having a porous structure; although the present invention also concerns the poly-N-vinylpyrrolidone having a number average molecular weight of between 400,000 and 2,000,000, preferably between 450,000 and 1,500,000 in any physical form.

Low temperature polymerization process

The hydrocarbon fluid friction reducing properties of copolymers of two or more alpha-monoolefins having 4 to 20 carbon atoms is improved by copolymerizing the monomers in the liquid state by means of a Ziegler catalyst at a temperature of about 0° C. or lower.

Generating Acid Downhole in Acid Fracturing

An acid fracturing method is provided in which the acid is generated in the fracture by hydrolysis of a solid acid-precursor selected from one or more than one of lactide, glycolide, polylactic acid, polyglycolic acid, a copolymer of polylactic acid and polyglycolic acid, a copolymer of glycolic acid with other hydroxy-, carboxylic acid-, or hydroxycarboxylic acid-containing moieties, and a copolymer of lactic acid with other hydroxy-, carboxylic acid or hydroxycarboxylic acid-containing moieties. The solid acid-precursor may be mixed with a solid acid-reactive material to accelerate the hydrolysis and/or coated to slow the hydrolysis. Water-soluble liquid compounds are also given that accelerate the hydrolysis. The method ensures that the acid contacts fracture faces far from the wellbore.

Polymer article and its use for controlled introduction of reagent into a fluid

A solid polymeric body comprising a polymer matrix containing a water-soluble reagent leachable into a fluid containing condensed water, said matrix being reagent permeative and insoluble in said fluid containing condensed water and the said body preferably having a softening point substantially above that of the temperature of the fluid environment in which it is to be employed is useful for the introduction of an additive reagent into said fluid particularly when said fluid is located in a subterranean formation.

Corrosion inhibitor composition

Well treatment

Polyamine condensates of styrene-maleic anhydride copolymers as corrosion inhibitors

Corrosion inhibiting compositions for metals subjected to highly acidic environments may be produced by reacting in a condensation reaction a styrene-maleic anhydride copolymer with a polyamine (or combination of polyamines) to produce a polyimidoamine inhibitor. A preferred inhibitor product may be produced by replacing up to 80% of the styrene-maleic anhydride copolymer with a member selected from the group consisting of: rosin, C 23 -C 24 modified rosins, C 8 -C 20 fatty acids, C 9 -C 22 modified fatty acids, and combinations thereof. These inhibitors exhibit excellent film forming and film persistency characteristics.

在地下含油地层中改进波及效率的泡沫体

提供了一种泡沫体，该泡沫体可用于在地下含油 地层中改进波及效率并可在地层中具体用于波及改 进处理和流度控制。泡沫体为一种其中分散了气体 的凝胶介质。凝胶介质由可交联聚合物、交聚剂、表 面活性剂以及液体溶剂组成。

Generation of acid by acid fracturing down the well

Polymeric well treating method

Several new treatment processes and compositions for practicing these processes are provided which substantially alter the fluid flow and surface characteristics of porous permeable particulate formations, especially subterranean formations intersected by an oil well. The compositions of this invention also provide methods of increasing viscosity or gelling aqueous fluids, especially acids, which can be used to treat such earthen formations. Treatment of the earthen formations with the compositions of this invention can substantially modify the permeability and surface characteristics of the formation to prevent or reduce the flow of aqueous fluids, especially water and formation brines through that portion of the formation, thereby reducing the water-oil ratio of fluid flowing through or produced from that formation and in some cases enhancing the hydrocarbon production. The treatment of this invention uses branched organic polymers of a wide molecular weight range. The branches are preferably hydrophilic and the polymer contains bonding groups (e.g. ionic bonding groups) which serve to attract or repel a substrate, a particular formation, suspended solids, other polymers or segments, carrier fluid or a fluid to be treated.

Method, process, apparatus and chemicals to produce and inject paraffin treating compounds

The present invention is a device and a method that combines a carbon disulfide-releasing chemical with a low pH organic or inorganic acid to produce a carbon disulfide-containing fluid at or near the point of injection that minimizes or eliminates the possible exposure of carbon disulfide to workers and the environment. In one particular embodiment a positive displacement injection pump injects the carbon disulfide-containing fluid into a crude oil system for treating crude oil transmission lines and in downhole tubulars to remove paraffin deposits. The device uses a unique in-line motion mixer to mix two fluids. The device is electronically controlled locally and remotely with the system operating data displayed locally and transmitted remotely. The paraffin treating carbon disulfide-containing fluid and supplemental chemicals dissolve, disperse and remove paraffin deposits.

Catalytic polymerisation of olefins

Method using encapsulated flow improvers to reduce turbulence

Polymeric flow improvers, whether alone or partially dissolved in a solvent, are encapsulated to provide a free flowing particulate powder which can be easily transported and subsequently placed into hydrocarbons wherein the outer shelf of the encapsules are subjected to melting, shear, dissolution, or the contents may be leached out to place the flow improver into intimate contact with the flowing hydrocarbons in a dispersed form such that drag reduction is immediate and effective. Optionally, the size of the particulate matter and the thickness of the encapsulating material are varied such that constant or delayed release of flow improver occurs as the hydrocarbon fluid is transported through conduits.

Methods of reducing fluid loss in a wellbore servicing fluid

Methods of reducing the fluid loss from a wellbore servicing fluid include combining a terpolymer with the wellbore servicing fluid to reduce the fluid loss from the fluid, followed by displacing the fluid into a wellbore. In an embodiment, the following monomers are used to make the terpolymer: from about 75 wt. % to about 95 wt. % of 2-acrylamido-2-methylpropanesulfonic acid or an alkali salt thereof; from about 3 wt. % to about 15 wt. % of acrylamide; and from about 3 wt. % to about 15 wt. % of N-vinyl-2-pyrrolidone, all weight percentages being based on a total weight of the monomers. The wellbore servicing fluid may comprise water or an aqueous salt solution such as a formate solution. The wellbore servicing fluid may also comprise clay such as montmorillonite and attapulgite clay.

Cross-linking of polymeric nu-vinyl lactams, polymeric vinyl esters and polymeric acrylate esters with alpha-omega aliphatic diolefins

Process for rapidly dissolving water-soluble polymers

Water-soluble vinyl addition polymers and gums may be rapidly dissolved in water by first dispersing these polymers into a water-in-oil emulsion and then inverting these emulsions in water. The inversion of the emulsion releases the polymer into water as a solution.

Inverted mixed latex for water flooding

An improved water flooding process for recovering oil from a subterranean oil-bearing formation which comprises introducing a stable liquid dispersion of a water-soluble anionic vinyl addition polymer and a water-soluble cationic polymer into an input well penetrating the formation. The dispersion comprises: A. A polymeric latex composed of a water-in-oil emulsion which contains dispersed therein a finely divided water-soluble anionic vinyl addition polymer, said polymeric latex having uniformly distributed therethroughout; and B. A water-soluble cationic polymer; WITH THE WEIGHT RATIO OF A:B being within the range of 1:10 to 10:1 and the total amount of A+B present within said dispersion being within the range of from 0.001 percent to 75 percent by weight.

Process and apparatus for dissolving water soluble polymers and gums in water involving inversion of water-in-oil emulsions

Water soluble vinyl addition polymers and gums are rapidly dissolved in water by first dispersing these polymers or gums into a water-in-oil emulsion, then mixing the water-in-oil emulsion with water, preferably in the presence of a surfactant, and inverting the emulsion by passing a confined stream of the resultant mixture in a tortuous path to produce turbulence so that the water soluble addition polymer or gum is released into the water as a solution.

Methods and compositions for acid treating subterranean formations

Methods and compositions for acid treating subterranean formations penetrated by well bores are provided. The compositions are each comprised of an aqueous acid solution, one or more acrylamide polymers dissolved in the acid solution, a liquid hydrocarbon dispersed in the acid solution, and one or more nonionic surface active agents having at least one reactive hydroxyl group per molecule. The acrylamide polymer or polymers increase the viscosity of the acid solution and the surface active agent or agents interact with the polymer or polymers whereby stabilized high viscosity results. The subterranean formation acid treating methods of the invention are carried out by introducing the high viscosity acid compositions therein, allowing the compositions to react until spent and recovering the compositions.

Methods of reducing fluid loss in a wellbore servicing fluid

Methods of reducing the fluid loss from a wellbore servicing fluid include combining a terpolymer with the wellbore servicing fluid to reduce the fluid loss from the fluid, followed by displacing the fluid into a wellbore. In an embodiment, the following monomers are used to make the terpolymer: from about 75 wt. % to about 95 wt. % of 2-acrylamido-2-methylpropanesulfonic acid or an alkali salt thereof; from about 3 wt. % to about 15 wt. % of acrylamide; and from about 3 wt. % to about 15 wt. % of N-vinyl-2-pyrrolidone, all weight percentages being based on a total weight of the monomers. The wellbore servicing fluid may comprise water or an aqueous salt solution such as a formate solution. The wellbore servicing fluid may also comprise clay such as montmorillonite and attapulgite clay.

Water-dispersible hydrophobic thickening agent

A water-soluble thicking agent comprises (1) a soluble polymer having pendant hydrophobic groups, obtained by copolymerization of a soluble vinyl compound (e.g. amides, carboxylic acids, quat. salts, sulphoalkyl alkenoates, aminoalkyl, and vinylaryl sulphonates) with a water-insoluble vinyl compound having a hydrophobic group with at least 8C'S; (2) a water-dispersible nonionic surfactant with hydrophobic groups; and (3) water-soluble inorganic salts, preferably NaCl and/or KCl (0.1-15 wt. %) Ca and/or Mg salts (0.01-10 wt.%). These compositions are used in the oil recovery process for the control of fluid mobility, as fracturing fluids and drilling muds, and or hydraulics and lubricants.

Mobility control agent

Polymer mobility control agents useful in supplemental oil recovery processes, which give improved reciprocal relative mobilities, are prepared by initiating the polymerization of a monomer containing a vinyl group with a catalyst comprising a persulfate and ferrous ammonium sulfate. The vinyl monomer is an acrylyl, a vinyl cyanide, a styryl and water soluble salts thereof.

Mobility control agent

Polymer mobility control agents useful in supplemental oil recovery processes, which give improved reciprocal relative mobilities, are prepared by initiating the polymerization of a monomer containing a vinyl group with a catalyst comprising a persulfate and ferrous ammonium sulfate. The vinyl monomer is an acrylyl, a vinyl cyanide, a styryl and water soluble salts thereof.

Oil recovery process

An on-site, in-line process and system for recovering oil from oil-bearing subterranean formations which involves the production, modification, dilution and injection of a polymer solution, preferably consisting essentially of an aqueous solution of a partially hydrolyzed polyacrylamide, having injectivity and mobility properties capable of meeting the specific permeability requirements of substantially any subterranean formation to be achieved. The polymer solutions prepared by the process and system can be used as drive fluids for displacing oil (secondary polymer flood) in an oil-bearing formation, as mobility buffers to follow micellar dispersion floods in the conjoint presence of chemical reagents in other chemical floods (e.g., surfactant, caustic, etc.), or they can follow a water flood. The solutions can also be used to promote pipelining of high viscosity crude oil. Irrespective of the use to which the solutions are put, the process and system enable the polymer solutions to be customized, or tailor-made, so to speak, to meet the performance demands of the environment in which they are to be used, whether it be an oil-bearing formation or a pipeline.

Preparation of aqueous polyacrylamide solutions for enhanced oil recovery

A process is disclosed for converting polyacrylamide gel into dilute aqueous solutions suitable for use in secondary oil recovery. Polyacrylamide gel is initially converted into a slurry of small gel particles in water from which forms a homogeneous solution concentrate which is then readily diluted to give the final drive fluid without any significant polymer degradation. The process may additionally be adapted to the drilling site or to other on site operations requiring polyacrylamide solutions such as water treating, mining or paper making.

Copolymers of N,N-dimethylacrylamide and acrylamide

Novel copolymers of N,N-dimethylacrylamide and acrylamide are disclosed where the ratio of NNDMA to AM ranges from 10:90 to 95:5. The hydrolyzed copolymer is also disclosed where hydrolysis ranges from 5% to 65% and the ratio of NNDMA to AM is 5:95 to 95:5. These hydrolyzed copolymers are useful in enhanced oil recovery operations.

Enhanced oil recovery methods and systems

Abstract of the Disclosure Methods of preparing viscous aqueous polymer solutions having improved viscosity and stability properties for use in the treatment of subterranean hydrocarbon-containing for-mations and in enhanced oil recovery processes are provided. Methods and systems for enhancing the recovery of oil from subterranean oil-containing formations are also provided. The viscous aqueous polymer solutions of the invention are prepared at the site of their use by polymerizing one or more water soluble polymerizable vinyl monomers in aqueous solutions which may contain high concentrations of one or more salts. The resultant viscous aqueous polymer solutions have improved properties including controlled polymer average molecular weight, controlled viscosity and stability in formation brines, increased tolerance to the presence of divalent metal cations and increased compatibility with oil well treating fluid additives.

Polymer solution production for oil recovery

Fluid additive and method for treatment of subterranean formations

A treatment fluid additive and method for treatment of subterranean formations to minimize formation permeability damage as a result of formation contact by the treatment fluid, wherein the fluid treatment additive is a formation control additive of the general formula: ##STR1## wherein R is independently a C 1 to C 4 alkyl, halogen and/or hydroxyl substituted alkyl and at least one R is a C 1 to C 4 halogen or hyroxyl substituted alkyl, and X - is selected from the group consisting of chloride, fluoride, bromide, iodide, nitrate, nitrite hydroxide, and sulfate.

[UNK]

Well cleaning with mixed liquefied propane and butane solvent

Method of hydraulic fracturing of a reservoir

FIELD: oil industry. SUBSTANCE: invention relates to oil and gas industry, in particular to methods of hydraulic fracturing of a formation in a production well in the presence of associated and / or plantar water. In the method of hydraulic fracturing of a formation, including the descent of a string of pipes with a packer into a well, the planting of a packer, hydraulic fracturing by pumping hydraulic fracturing fluid through a column of pipes with a packer through the interval of perforation into the productive formation with the formation and subsequent fastening of the crack by pumping hydraulic fracturing fluid with proppant, bleeding the pressure from the well, prior to the hydraulic fracturing in the bottomhole zone of the formation, water is pumped with a density of 1,000-1,050 kg/m 3 with a flow rate of 1.0 m 3 /min, then injection of hydraulic fracturing fluid, which is a cross-linked gel, formation of a fracture is initiated along the pipe string in the formation interval, fracture cracks are developed and fastened in two stages, where at the first stage a 30/60 mesh proppant is pumped into the created crack, coated with a water-swelling rubber-polymer composition, with a concentration of 600 kg/m 3 in the amount of 50-60% of the total proppant mass with the addition of fiberglass filler in an amount of 1.0% by weight of the proppant, at the second stage, a 20/40 mesh 20/40 mesh proppant is injected cyclically at a rate of 20-25% of the total proppant mass and 40/70 mesh fines, coated with a water-swelling rubber-polymer composition in an amount of 20-25% of the total proppant mass, cyclic injection is carried out in equal portions: 1m 3 of crosslinked gel, proppant fraction 20/40 mesh in 1 m 3 of crosslinked gel, 1m 3 of cross-linked gel, proppant fraction 40/70 mesh in 1 m 3 of cross-linked gel with increasing proppant concentration in each cycle, starting at a concentration of 200 to 900 kg/m 3 , within each cycle between different proppant fractions, ...

Method for recovery and transportation of high-viscous petroleum products

FIELD: oil production industry. SUBSTANCE: according to method, produced are water suspensions of high-viscous petroleum products. This is done by bringing them in contact with water solution of disperser. Recovery and transportation of petroleum products are carried out when they are in the form of water dispersions. In realization of this method, obtained is water dispersion of high-viscous petroleum products with content of water of at least 15 mass%. Used as water solution of disperser is water solution of sulfonated disperser selected from organic sulfonates of alkaline metal or ammonium salts of organic sulfonic acids. Content of sulphur is at least 10 mas. % relative to sodium salts of sulfonates. Solubility in water at temperature of 20 C is at least 15 mas.%. Reduction of water surface tension at content of 1 mas.% is not over 10 mas.%. This method increases efficiency of recovery and transportation of high-viscous petroleum products. EFFECT: higher efficiency. 8 cl, 8 dwg бУУЗзЗЕГсС ПЧ Го РОССИЙСКОЕ АГЕНТСТВО ПО ПАТЕНТАМ И ТОВАРНЫМ ЗНАКАМ (19) ВИ "” 21418 449 ' 13) СЛ 517 МК” | 24 В 43/22 12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ РОССИЙСКОЙ ФЕДЕРАЦИИ (21), (22) Заявка: 94016355/03, 03.07.1993 (30) Приоритет: 06.07.1992 |Т М!92АО01643 15.07.1992 11 М! 92А001712 (46) Дата публикации: 27.08.1998 (56) Ссылки: Ц, патент, 4966235, кл. Е 21 В 43/22, 1990. (71) Заявитель: Эниричерке С.п.А (1Т), Аджип С.п.А. (1Т) (72) Изобретатель: Альберто Ди Лулло Альберто (ТТ), Армандо Маркотуллио (1Т), Энрико Боргарелло (тт) (73) Патентообладатель: Эниричерке С.п.А (1Т), Аджип С.п.А. (Т) С (54) СПОСОБ ДОБЫЧИ И ТРАНСПОРТИРОВАНИЯ ВЫСОКОВЯЗКИХ НЕФТЕПРОДУКТОВ (57) Реферат: Способ добычи и транспортирования высоковязких нефтепродуктов включает получение водных дисперсий высоковязких нефтепродуктов путем приведения их в контакт с водным раствором диспергатора, извлечение и перемещение указанных нефтепродуктов в виде водных дисперсий. При осуществлении этого способа получают водную дисперсию ...

Oil-in-water emulsion for secondary and tertiary production of petroleum

Изобретение относитс  к эмульсии типа масло в воде, содержащей ксантановую смолу. Эмульси  может быть использована дл  вторичной и третичной добычи нефти. Целью изобретени   вл етс  получение стабильной эмульсии при высоких концентраци х ксантановой смолы. Это достигаетс  тем, что эмульси  содержит, мас.%: ксанта- нова  смола 9,1-38,2; масло 1,1-48; поверхностно-активное вещество 1,6-25,9; вода остальное до 100%. В качестве масла она содержит смесь ароматических Cio-Cia-yr- леводородов с ТКип. 225-290&amp;deg;С или смесь алифатических Сц-С15-углеводородов с Ткип. 205-265&amp;deg;С, в качестве поверхностно- активного вещества - тристирилфеноксиэ- тилен, додецилбензолсу ьфонат кальци , оксиэтилированный Са-алкиларилфенол- фосфат со степенью оксиэтилировани  25, этоксилированный лауриловый спирт со степенью оксиэтилировани  2, полиэток- силированный нонилфенол со степенью оксиэтилировани  14, Сэ-алкиларилполи- эфирфосфат со степенью оксиэтилировани  6 или полиэтоксилированный линейный спирт Ct2-Ci4 со степенью оксиэтилировани  3. 5 табл. сл С This invention relates to an oil-in-water emulsion containing xanthan gum. The emulsion can be used for secondary and tertiary oil production. The aim of the invention is to obtain a stable emulsion at high concentrations of xanthan gum. This is achieved by the fact that the emulsion contains, in wt.%: Xanthan gum, 9.1-38.2; oil 1.1-48; surfactant 1,6-25,9; water the rest is up to 100%. As an oil, it contains a mixture of aromatic Cio-Cia-yr-hydrogens with TCip. 225-290 ° C or a mixture of aliphatic Cc-C15 hydrocarbons with batch. 205-265 &amp;deg; C, as the surfactant - tristirilfenoksie- Thielen, dodetsilbenzolsu fonat calcium alkilarilfenol- ethoxylated Ca-phosphate having a degree of ethoxylation of 25, an ethoxylated lauryl alcohol with ethoxylation degree of 2, polietok- silirovanny nonylphenol with a degree of ethoxylation 14 , Ce-alkylaryl polyetherphosphate with a degree of ethoxylation of 6 or polyethoxylated ...

Low temperature polymerization process

Low temperature polymerization process

Lagetemperatuurpolymerisatieproces.

Fremgangsmaate for fremstilling av alfa-olefinkopolymerer

De hydrokarbonvæskefriksjonsreduserende egenskaper for sampolymerer av to eller flere alfa-monoolefiner med fra 4 til 20 karbonatomer, er bedret ved at man sampolymeriserer monomerene i væsketil-stand ved hjelp av en Ziegler-katalysator ved en temperatur på ca. 0°C eller lavere, og hydrokarboner som inneholder nevnte væskefriksjonsreduserende forbindelser.

Low temperature polymerization process

Method for treating underground oil-bearing formation with area of higher permeability and area of lower permeability

FIELD: oil production. SUBSTANCE: method includes pumping liquid in the area of higher permeability to reduce this permeability. The liquid represents a foam with polymer, joining agent able to join the above polymer, surface-active substance, liquid dissolver and frothing gas. EFFECT: high efficiency. 13 cl т 93$ с90с ПЧ Го РОССИЙСКОЕ АГЕНТСТВО ПО ПАТЕНТАМ И ТОВАРНЫМ ЗНАКАМ (19) (51) МПК ВИ” 2 062 864 ' 13) Сл Е 21 В 33/138 12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ РОССИЙСКОЙ ФЕДЕРАЦИИ (21), (22) Заявка: 93004965/03, 26.04.1991 (30) Приоритет: 10.08.1990 1$ 566027 (46) Дата публикации: 27.06.1996 (56) Ссылки: Патент США М 4683949, кл. Е 21 В 33/133, опубл.1987. (86) Заявка РСТ: 1$ 9102875 (26.04.91) (71) Заявитель: Маратон Ойл Компани (ЦЗ) (72) Изобретатель: Роберт Д. Сиданск[Ц$] (73) Патентообладатель: Маратон Ойл Компани (ЦЗ) (54) СПОСОБ ОБРАБОТКИ ПОДЗЕМНОЙ НЕФТЕНОСНОЙ ФОРМАЦИИ, ИМЕЮЩЕЙ ОБЛАСТЬ БОЛЕЕ ВЫСОКОИ ПРОНИЦАЕМОСТИ И ОБЛАСТЬ БОЛЕЕ НИЗКОЙ ПРОНИЦАЕМОСТИ (57) Реферат: Способ включает закачку в области более высокой проницаемости для снижения последней жидкости, представляющей собой пену, содержащую полимер, сшивающий агент, способный к сшиванию указанного полимера, поверхностно-активное вещество, жидкий растворитель и вспенивающий газ. 12 з.п. Ф-Лы. 2062864 С1 КО т 93$ с90с ПЧ Го (19) 13) ВИ “” 2 062 864 ' (51) п. С1.6 Е 21 В 33/138 СЛ КУЗЗАМ АСЕМСУ ГОК РАТЕМТ$ АМО ТКАОЕМАКК$ 12) АВЗТКАСТ ОЕ 1МУЕМТОМ (21), (22) Аррисайоп: 93004965/03, 26.04.1991 (71) АррисапЕ Магаюп ОЛ Котрапи! (ЦЗ) (30) Риогйу: 10.08.1990 Ц$ 566027 (72) пуетог. — КоБемй О. З4апК$] (46) Рае о! рибИсаНоп: 27.06.1996 о (73) Ргорпеюг: (86) РСТ аррИсаНоп: Магаюп ОЛ Котрапг (ЦЗ) $ 91028715 (26.04.91) (54) МЕТНОО РОК ТВЕАТМС УМОЕКСКОЧМО ОШ-ВЕАРНМС ГОКМАТЮМ М/ТН АКВЕА ОЕ НСНЕКВ РЕКМЕАВШЕПУ АМО АКЕА ОГ ГОМЕК РЕКМЕАВШЕПУ (57) АБзасЕ: мп роутег, |отта адеп а фе 0 |от Ше НЕБО: ой ргодисНоп. ЗУВЗТАМСЕ: тейоа ароуе роутег, зиПасе-асйуе зибЗапсе, псуиаез ритрта Паша шт Ше агеа © аи 91$зомМег апа Кота дах. ЕРЕЕСТ: ...

自破坏型滤饼

本发明提供了用于井筒和地下地层中自破坏型防滤失剂和滤饼的组合物和方法。所述防滤失剂和滤饼由粒状固体酸-前体如聚乳酸或聚乙醇酸，以及粒状固体酸-反应性物质如氧化镁或碳酸钙的混合物形成。在水存在下，固体酸-前体水解并溶解，产生酸，然后溶解固体酸-反应性物质。所述组合物用于油田处理如钻井、完井和增产中，在不再需要它时使其消失，而无需使用机械方式或注入另外的流体。

Treatment method of bottom-hole formation zone

FIELD: oil and gas industry. SUBSTANCE: method for treatment of bottomhole formation zone, characterized in that bottomhole formation zone is treated successively with emulsion solution-ES, oil fringe and acid composition consisting of 15% hydrochloric acid, diethylene glycol, acetic acid, water-repellent agent based on amides, corrosion inhibitor and industrial water, at that, wetability of bottomhole formation zone rock of production formation is preliminary determined and in case of rock hydrophilicity of productive interval, direct type ES of the following composition is used, wt %: hydrocarbon phase in the form of diesel fuel or prepared oil from oil-collecting station 20 -25, emulsifier of Sinol-EM type or sinol EMP 3-5, colloidal solution of silicon dioxide nanoparticles containing (wt %): colloidal silicon dioxide in acrylic acid 40, propylene glycol monomethyl ether 59.5 and water - the rest, 0.5-3, aqueous phase in the form of solution of calcium chloride or sodium chloride solution-the rest, in case of hydrophobic properties of these rocks an ES of reverse type is used in the following composition (wt %): said hydrocarbon phase 40-45, said emulsifier 3-5, said colloidal solution of nanoparticles of silicon dioxide 1-3, aqueous phase in the form of solution of calcium chloride or sodium chloride solution-the rest. EFFECT: increased emulsion solutions stability for complex technology of oil production intensification, obtained additional oil production, increased efficiency of wells with high production rate. 13 ex, 7 dwg

Synthetic oil-water emulsion drill-in fluid cleanup methods

The present invention provides methods of cleaning up a producing interval of a well bore drilled using a synthetic oil-water emulsion drill-in fluid. The methods basically comprise contacting filter cake and drill-in fluid on the walls of the well bore with three treatment fluids in three stages, the first and second treatment fluids being comprised of water, a filter cake dissolving acid, a mutual solvent and an emulsion penetrating agent. The third treatment fluid is comprised of water, a filter cake dissolving acid and a water wetting surfactant.

Method of oil recovery by tertiary methods

FIELD: oil and gas industry.SUBSTANCE: method of oil recovery in which an injected aqueous agent containing at least water-soluble polyacrylamide PAA (co)polymer dissolved in water-based liquid, pumped through at least one injection well into oil-bearing deposit, and crude oil is extracted from deposit through at least one production well. The method includes at least the following stages: providing liquid dispersion polymer composition, at least, containing, wt %: 20-59.9 of organic hydrophobic liquid with boiling point above 100°C, 40-79.9 of particles of at least one water-soluble of PAA (co)polymer with average particle size from 0.4 mcm to 5 mcm dispersed in organic liquid, where soluble in water PAA (co) polymer contains 30-100 wt % of acrylamide units relative to total amount of all monomer units in (co)polymer and has average molecular weight Mfrom 5,000,000 g/mol to 30,000,000 g/mol, and 0.1-10 of at least two surface-active substances (SAS), where SAS (C) contains 0.05-5 wt % of at least one surfactant (C1) capable of stabilising water-in-oil emulsions and 0.05-5 wt % of at least one surfactant (C2) capable to stabilizing the dispersion, the water content in liquid dispersion of polymer composition is less than 10 wt % and the quantity of each component of liquid dispersion polymer composition are presented on the basis of total number of its all components, adding at least one activating surfactant (D) in the liquid dispersion polymer composition. Wherein the surfactant (D) is different from the surfactant (C) and has HLB index greater than 9, mixing the liquid dispersion polymer composition containing at least one activating surfactant (D), with water-based liquid, thereby producing the aqueous injected agent containing at least one PAA (co)polymer dissolved therein, where the concentration PAA (co)polymer in the injected agent amounts to 0.05-0.5 wt % based on the total amount of all components of the injected agent, and pumping water injected agent ...

Stable suspensions of water-soluble polymers and their manufacture

Stable suspension of a water-soluble polymer comprising solid particles of this water-soluble polymer in a liquid hydrocarbon medium which also comprises a thickening agent selected from the alkali or alkaline-earth metal salts of fatty acids having from 6-33 carbon atoms. The resultant suspensions are stable and dissolve easily when dispersed in water; they can be used in enhanced oil recovery.

Process for the preparation of a solid polymer from vinyl pyrrolidone and its use

Patent JPS5919127B2

Patent FR2312516B1

Production of high molecular weight vinyl lactam polymers and copolymers

Water-soluble polymers comprising an N-vinyl lactam are found to be useful in processes wherein the polymer is introduced into a subterranean wellbore. Polymers useful in the recovery of natural resources are prepared by polymerizing an N-vinyl lactam by free radical initiation, with polymerization conducted in an aqueous solution polymerization medium preferably containing a mixture of dissolved electrolytes, or in a polymerization medium consisting essentially of a tertiary alkanol. Copolymers of such N-vinyl lactams with unsaturated amides, and terpolymers prepared by polymerizing an N-vinyl lactam and an unsaturated amide with a selected termonomer compound are also useful when prepared by these methods.

Polymers useful in the recovery and processing of natural resources

Water-soluble polymers comprising an N-vinyl lactam are found to be useful in processes wherein the polymer is introduced into a subterranean wellbore. Polymers useful in the recovery of natural resources are prepared by polymerizing an N-vinyl lactam by free radical initiation with polymerization conducted in an aqueous solution polymerization medium preferably containing a mixture of dissolved electrolytes, or in a polymerization medium consisting essentially of a tertiary alkanol. Copolymers of such N-Vinyl lactams with unsaturated amides, and terpolymers prepared by polymerizing an N-vinyl lactam and an unsaturated amide with a selected termonomer compound are also useful when prepared by these methods. The invention also broadly encompasses utilizing a water soluble polymer comprising at least one of a hydrophilic vinyl-containing sulfonate and a hydrophilic N-vinyl lactam under hostile conditions.

Polymers useful in the recovery and processing of natural resources

Water-soluble polymers comprising an N-vinyl amide such as an N-vinyl lactam are found to be useful in processes wherein the polymer is introduced into a subterranean wellbore. Polymers useful in the recovery of natural resources are prepared by polymerizing an N-vinyl lactam by free radical initiation with polymerization conducted in an aqueous solution polymerization medium preferably containing a mixture of dissolved electrolytes, or in a polymerization medium consisting essentially of a tertiary alkanol. Copolymers of such N-vinyl lactams with unsaturated amides, and terpolymers prepared by polymerizing an N-vinyl lactam and an unsaturated amide with a selected termonomer compound are also useful when prepared by these methods. The invention also broadly encompasses utilizing a water-soluble polymer comprising at least one of a hydrophilic vinyl-containing sulfonate, phosphonate or ester and/or a hydrophilic N-vinyl lactam for applications under hostile conditions.

Method of increasing moleculaa weight of vinyl pyrrolidone polymer

PROCESS FOR OBTAINING A POLYVINYL-PYRROLIDONE WITH INCREASED MOLECULAR MASS, AND ITS APPLICATION

HIGH MOLECULAR POLYVINYLPYRROLIDONE AND METHOD FOR THEIR PRODUCTION

Hydrophobic associative composition containing a polymer of a water-soluble monomer and an amphiphilic monomer

ABSTRACT A hydrophobe associative composition of an ethylenically unsaturated, water-soluble monomer such as acrylamide and an ethylenically unsaturated amphi-philic monomer such as dodecyl poly(oxyethylene)10 meth-acrylate which is particularly effective for increasing the viscosity of brines or other aqueous media contain-ing salts or other electrolytes. Such copolymers are therefore useful in mobility control fluids and fractur-ing fluids for enhanced oil recovery and as drag reduc-tion agents.

Мицелл рна смесь дл добычи нефти

Изобретение относитс  к нефтедобывающей пром. Цель - повышение нефтевытесн ющей способности состава за счет снижени  межфазного нат жени  между мицелл рной смесью и нефтью и устойчивостью к жесткой воде. Смесь содержит следующие компоненты при их соотношении, мас.% : углеводород 10-70 поверхностно-активное вещество (ПАВ) 6-14 спирт 0,8-6 вода 10-80. В качестве ПАВ используют смесь альфа-олефинового сульфоната. Он содержит 12-24 атомов углерода и этоксилата, выбранного из группы, состо щей из (I) полиоэксиэтиленалкилового эфира формулы R 1 O - CH 2 CH 2M - H, где R 1 - линейна  или разветвленна  алкильна  или алкенильна  группа, содержаща  от 10 до 18 атомов углерода, M - число 1-10, или из группы (II) полиоксиэтиленалкилфенильного эфира, при массовом соотношении альфа-олефинового сульфоната и этоксилата 5,5-1,5 до 3:6. Данна  смесь используетс  дл  добычи нефти и представл ет собой прозрачные микроэмульсии. Смесь обладает стойкостью к жесткой воде и устойчивостью к сол м щелочных металлов. 7 табл.

Method of producing oil from underground deposit of medium-to-high salinity

Изобретение относитс  к добыче нефти. Цель - повышение экономичности процесса. В залежь нагнетают жидкость в виде эмульсии, содержащей в качестве эмульгатора карбоксиметилированный оксиэтилат общей ф-лы (см.описание) в кол-ве 0,5-15% в пересчете на водную фазу эмульсии. В качестве водной фазы эмульсии используют пластовую воду. Нагнетание осуществл ют при т-ре инверсии фаз системы нефть-пластова  вода-оксиэтилаты, равной или на 10°С выше т-ры залежи. Т-ру инверсии фаз определ ют при помощи измерени  электропроводности. Дл  приготовлени  эмульсии могут быть использованы также иные, чем нефть, масла, смеси нефтей, частично рафинированные фракции нефти, газойл , керосин или бензины, а также их смеси с нефтью. Пригодной органической фазой эмульсии  вл ютс  также смеси из чистых углеводородов. Объем нагнетаемой эмульсии, соотношение ее фаз, содержание ПАВ и возможные добавки, а также вид и величина контролирующего мобильность полимерного раствора можно оптимировать путем заводнени  на модели. 1 табл. The invention relates to the extraction of oil. The goal is to increase the efficiency of the process. A fluid is injected into the reservoir in the form of an emulsion containing, as an emulsifier, carboxymethylated oxyethylate of a general form (see description) in a quantity of 0.5-15% in terms of the aqueous phase of the emulsion. Formation water is used as the aqueous phase of the emulsion. The injection is carried out at t-re phase inversion of the system of oil-reservoir water-hydroxyethylates equal to or 10 ° C higher than the t-ry of the deposit. The phase inversion t-ru is determined by measuring the conductivity. Other than oil, oils, mixtures of oils, partially refined fractions of oil, gas oil, kerosene or gasolines, and mixtures thereof with oil can also be used to prepare the emulsion. Suitable organic phase emulsions are also mixtures of pure hydrocarbons. The volume of the injected emulsion, the ratio of its phases, the content of surfactants and possible ...

Process for the preparation of high molecular weight poly(vinylamines)

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Composition and method of increased oil yield

FIELD: oil and gas production. SUBSTANCE: present invention refers to chemical composition and to its application for increasing production and reserves of oil by secondary or tertiary methods. The chemical composition used in boring operations for oil production consists of ammonia, alcohol and water solution-carrier present in volume sufficient to completely dissolve composition of ammonia and alcohol. The method of realisation of the above said composition includes introducing this composition into a reservoir at amount efficiently increasing hydrocarbon production and withdrawing. EFFECT: increased oil production. 19 cl, 3 ex, 2 dwg РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) 2 363 718 (13) C2 (51) МПК C09K 8/58 (2006.01) E21B 43/22 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ, ПАТЕНТАМ И ТОВАРНЫМ ЗНАКАМ (12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ (21), (22) Заявка: 2006139939/03, 12.04.2005 (24) Дата начала отсчета срока действия патента: 12.04.2005 (73) Патентообладатель(и): КОРИБА ТЕКНОЛОДЖИЗ, Эл.Эл.Си. (US) R U (30) Конвенционный приоритет: 13.04.2004 US 60/561,669 (72) Автор(ы): КОББ Харви Г. (US) (43) Дата публикации заявки: 20.05.2008 2 3 6 3 7 1 8 (45) Опубликовано: 10.08.2009 Бюл. № 22 (56) Список документов, цитированных в отчете о поиске: RU 2082877 С1, 27.06.1997. SU 1124118 А, 28.08.1980. SU 1501598 А1, 23.05.1991. SU 1403701 А1, 27.03.1995. FR 2735524 А1, 20.12.1996. US 4813482 А, 21.03.1989. US 4553593 А, 19.11.1985. 2 3 6 3 7 1 8 R U (86) Заявка PCT: US 2005/012229 (12.04.2005) C 2 C 2 (85) Дата перевода заявки PCT на национальную фазу: 13.11.2006 (87) Публикация PCT: WO 2005/100745 (27.10.2005) Адрес для переписки: 129090, Москва, ул. Б.Спасская, 25, стр.3, ООО "Юридическая фирма Городисский и Партнеры", пат.пов. Е.Е.Назиной, рег. № 517 (54) КОМПОЗИЦИЯ И СПОСОБ ПОВЫШЕННОЙ ДОБЫЧИ НЕФТИ (57) Реферат: Настоящее изобретение относится к химической композиции и ее использованию для увеличения добычи и запасов нефти вторичным и/или третичным способами. ...

Compositions and Methods for Treatment of Well Bore Tar

Of the many compositions and methods provided herein, one method includes a method comprising: contacting tar resident in a well bore with a treatment fluid comprising a styrene-acrylate polymer; and allowing the styrene-acrylate polymer to interact with the tar to at least partially reduce the tendency of the tar to adhere to a surface. Another method provided herein includes a method for treating tar sand comprising: contacting the tar sand with a treatment fluid comprising an aqueous fluid and a styrene-acrylate polymer, the tar sand comprising tar and sand; and allowing the styrene-acrylate polymers to interact with the tar to at least partially separate the tar from the sand.

Silicate-Containing Additives for Well Bore Treatments and Associated Methods

Methods and compositions for use in subterranean operations, and more particularly, additives comprising one or more silicates used to treat tar resident in a well bore, and methods of use, are provided. In one embodiment, the method comprises a method of treating tar resident in a well bore comprising providing a tar-treating additive comprising one or more silicates introducing the tar-treating additive into the well bore; and allowing the tar-treating additive to react with the tar resident in the well bore so as to at least partially reduce the adhesiveness of the tar.

Compositions and methods for treatment of well bore tar

Of the many compositions and methods provided herein, one method includes a method comprising: contacting tar resident in a well bore with a treatment fluid comprising a styrene-acrylate polymer; and allowing the styrene-acrylate polymer to interact with the tar to at least partially reduce the tendency of the tar to adhere to a surface. Another method provided herein includes a method for treating tar sand comprising: contacting the tar sand with a treatment fluid comprising an aqueous fluid and a styrene-acrylate polymer, the tar sand comprising tar and sand; and allowing the styrene-acrylate polymers to interact with the tar to at least partially separate the tar from the sand.

Solids-free, essentially all-oil wellbore fluid

A solids-free, essentially all-oil wellbore fluid comprises (a) an organic fluid having (i) a melting point less than about 20° C. (about 68° F.), (ii) a flash point greater than about 54.4° C. (about 130° F.), and (iii) a dipole moment greater than 0 debye (D), and (b) a salt dissolved in the organic fluid. The wellbore fluid is employed in well drilling, completion, and work-over operations.

Development method of non-homogeneous oil formation with use of polymer-dispersed composition

FIELD: oil and gas industry. SUBSTANCE: in a development method of non-homogeneous oil formation comprising injecting an aqueous polymer dispersion containing polyacrylamide-PAA, a cross-linking agent and a micro-reinforcing additive into the well, and squeezing it to the formation with water, a polymer composition containing, wt %: partially hydrolysed PAA 12.00-17.00, microsilica or microcalcite is the rest, chromium (III) acetate or a cross-linking composition is used as a cross-linking agent, wt %: chrome (III) acetate 2.00-10.00 and 20.0-23.0% hydrochloric acid is the rest, the noted composition being obtained by introducing into the water of fresh or mineralized water with a density of up to 1.012 g/cm 3 of the noted polymer composition containing microsilica, while stirring it to complete hydration of the PAA and then introducing a chromium (III) acetate crosslinking agent or the noted cross-linking composition upon pumping into the well, with the following component ratio, wt %: the noted polymeric composition containing microsilica 1.0-7.0, chromium (III) acetate 0.01-0.1 or the noted cross-linking composition 0.5-1.5, the noted water is the rest, or introducing into the water of fresh or mineralized water with a density of up to 1.012 g/cm 3 of the noted polymeric composition containing a microcalcite, while stirring it to complete hydration of the PAA and then introducing a chromium (III) acetate crosslinking agent upon pumping into the well, at the following component ratio, wt %: the noted polymer composition containing a microcalcite of 1.0-7.0, chromium (III) acetate 0.01-0.1, the noted water is the rest. EFFECT: increased homogeneity of the composition and provided possibility of adjusting the cross-linking time. 2 tbl, 9 ex РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 2 627 502 C1 (51) МПК E21B 43/22 (2006.01) C09K 8/60 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ (21)(22) Заявка: 2016104805, 12.02. ...

NON-Aqueous Slurries Usable As Thickener

Non-aqueous slurries used as thickeners

Described herein is an improved non-aqueous slurry suitable for use as a thickener or viscosifier in oil or gas drilling, fracturing, flow diversion, completion or workover fluids, which slurry comprises a water-soluble cellulose ether polymer, a water-insoluble liquid hydrocarbon, a non-ionic surfactant having an HLB of from about 7 to about 14, and an organo modified clay.

IN SITU CHANNELING METHOD AND SYSTEM TO INCREASE FRACTURE CONDUCTIVITY

Un método y sistema para aumentar la conductividad de la fractura. Una etapa de suspensión de tratamiento tiene una concentración continua de primera partícula sólida y una concentración discontinua de anclaje entre las subetapas ricas en anclaje y subetapas pobres en anclaje dentro de la etapa de suspensión de tratamiento. A method and system to increase fracture conductivity. A treatment suspension stage has a continuous concentration of the first solid particle and a discontinuous anchor concentration between the anchor-rich sub-stages and anchor-poor sub-stages within the treatment suspension stage.

PROCEDURE FOR THE RECOVERY OF HYDROCARBONS

Los hidrocarburos se recuperan de formaciones subterráneas mediante inundacion con agua. El método comprende pasar un fluido de desplazamiento acuoso por vía de un pozo de inyeccion a través de una formacion de gres porosa y permeable para liberar crudo y recuperar dicho crudo recuperado en un pozo de produccion separado de dicho pozo de inyeccion, en donde (a) la formacion de gres comprende al menos un mineral que tiene un potencial zeta negativo en las condiciones de la formacion; (b) están presentes crudo y agua innata en los poros de la formacion; y (c) la fraccion del contenido en cationes divalentes de dicho fluido de desplazamiento acuoso al contenido en cationes divalentes de dicho agua innata es menor de 1. Hydrocarbons are recovered from underground formations by flooding with water. The method comprises passing an aqueous displacement fluid via an injection well through a porous and permeable stone formation to release oil and recover said recovered oil in a production well separated from said injection well, where (a ) the stone formation comprises at least one mineral that has a negative zeta potential under the conditions of the formation; (b) crude and innate water are present in the pores of the formation; and (c) the fraction of the divalent cation content of said aqueous displacement fluid to the divalent cation content of said innate water is less than 1.

Method of controlling particulate flowback in subterranean wells and introducing treatment chemicals

The present invention provides a method of treating a subterranean formation with a particulate laden fluid whereby particulate flowback is reduced or prevented while also providing a controlled release of a treatment chemical within the formation. The method includes the steps of providing a fluid suspension including a mixture of a particulate, a tackifying compound and a treatment chemical, pumping the suspension into a subterranean formation and depositing the mixture within the formation whereby the tackifying compound retards movement of at least a portion of the particulate within the formation upon flow of fluids from the subterranean formation and said tackifying compound retards release of at least a portion.

Microcapsule well treatment

A material and a device for releasing chemicals in a fluid environment is disclosed, and a method for releasing substances into downhole fluid environments. The invention also relates to materials for sand control and hydraulic fracturing. The substance release device typically comprises a polymeric material for releasing a substance into a downhole fluid environment in a well, and in preferred embodiments the material comprises a spherical, plastic chemical release capsule which is hard, permeable and may encapsulate a range of solids and/or liquids for subsequent release. These solids or liquids can include inhibitors such as scale inhibitors and other oilfield production chemicals for release into the wellbore of an oil or gas producing well or a water injection well.

Microcapsule well treatment

A material and a device for releasing chemicals in a fluid environment is disclosed, and a method for releasing substances into downhole fluid environments. The invention also relates to materials for sand control and hydraulic fracturing. The substance release device typically comprises a polymeric material for releasing a substance into a downhole fluid environment in a well, and in preferred embodiments the material comprises a spherical, plastic chemical release capsule which is hard, permeable and may encapsulate a range of solids and/or liquids for subsequent release. These solids or liquids can include inhibitors such as scale inhibitors and other oilfield production chemicals for release into the wellbore of an oil or gas producing well or a water injection well.

Microcapsule well treatment

A material and a device for releasing chemicals in a fluid environment is disclosed, and a method for releasing substances into downhole fluid environments. The invention also relates to materials for sand control and hydraulic fracturing. The substance release device typically comprises a polymeric material for releasing a substance into a downhole fluid environment in a well, and in preferred embodiments the material comprises a spherical, plastic chemical release capsule which is hard, permeable and may encapsulate a range of solids and/or liquids for subsequent release. These solids or liquids can include inhibitors such as scale inhibitors and other oilfield production chemicals for release into the wellbore of an oil or gas producing well or a water injection well.

In situ channelization method and system for increasing fracture conductivity

A method and system for increasing fracture conductivity. A treatment slurry stage has a continuous first solid particulate concentration and a discontinuous anchorant concentration between anchorant-rich substages and anchorant-lean substages within the treatment slurry stage.

Acidic surfactant composition and method for cleaning wellbore and flowline surfaces using the surfactant composition

A method and composition for removing deposits of heavy hydrocarbonaceous materials and finely divided inorganic particulate matter from wellbore and flowline surfaces using a composition containing an alkyl polyglycoside, an ethoxylated alcohol, an acid and an alkyl alcohol.

Methods and compositions for testing subterranean formations

The improved recovery of hydrocarbons from subterranean formations by hydraulically fracturing a subterranean formation is accomplished. Fracturing fluids using a viscoelastic surfactant fluid containing wormlike micelles are useful to improve recovery of hydrocarbons and limit the loss of fracturing fluid into the formation fracture face. The invention further relates to novel fracturing methods useful for increasing hydrocarbon production, limiting connate water production, resisting fracturing fluid loss into the subterranean formation, and reducing the equipment requirements in mixing and pumping fracturing fluid. The action of micelles of surfactant in aqueous zones of the subterranean formation facilitates the flowback of increased amounts of hydrocarbons once a fractured well is placed back on production.

Foamed acidizing fluids, additives and methods of acidizing subterranean zones

The present invention provides environmentally safe foamed acidizing fluids for acidizing subterranean zones, additives for foaming and stabilizing foamed acidizing fluids and methods of acidizing subterranean zones. The foamed acidizing fluids are basically comprised of an aqueous acid solution, sufficient gas to form a foam and an effective amount of an additive for foaming and stabilizing the aqueous acid solution comprised of hydrolyzed keratin.

Microbial heteropolysaccharide

ABSTRACT An heteropolysaccharide known as Biopolymer PS 87 comprises glucose, galactose, mannose, glucuuronic acid and fucose. Biopolymer PS 87 is pseudoplastic, has a consistency at 20°C of at least 150 poise and a yield stress value at 20°C of at least 30 dynes/cm2. Biopolymer PS 87 is synthesised by a strain of Bacillus polymyxa or a genetically similar micro-organism and has many domestic and industrial uses as a suspending agent or thickener.

Aqueous drilling fluid and mobility control solution for use on recovery

An heteropolysaccharide known as Biopolymer PS 87 comprises glucose, galactose, mannose, glucuronic acid and fucose. Biopolymer PS 87 is pseudoplastic, has a consistency at 20° C. of at least 150 poise and a yield stress value at 20° C. of at least 30 dynes/cm 2 . Biopolymer PS 87 is synthesized by a strain of Bacillus polymyxa or a genetically similar micro-organism and has many domestic and industrial uses as a suspending agent or thickener.

Potassium hydroxide clay stabilization process

An aqueous solution having potassium hydroxide dissolved therein is injected into a subterranean sandstone formation containing water-sensitive fine particles, including clays. Potassium hydroxide stabilizes the fine particles for a substantial period of time thereby substantially preventing formation permeability damage caused by encroachment of aqueous solutions having a distinct ionic makeup into the treated formation.

Water-in-Oil Emulsions With Hydrogel Droplets Background

Methods and compositions are provided that include a water-in-oil composition comprising an oil-based continuous phase and a discontinuous phase that comprises at least a plurality of hydrogel droplets and a method comprising providing a water-in-oil emulsion comprising an oil-based continuous phase and a discontinuous phase that comprises at least a plurality of hydrogel droplets; and placing the water-in-oil emulsion in a well bore penetrating a subterranean formation. Additional methods are also provided.

Water-in-oil emulsions with hydrogel droplets background

Methods and compositions are provided that include a water-in-oil composition comprising an oil-based continuous phase and a discontinuous phase that comprises at least a plurality of hydrogel droplets and a method comprising providing a water-in-oil emulsion comprising an oil-based continuous phase and a discontinuous phase that comprises at least a plurality of hydrogel droplets; and placing the water-in-oil emulsion in a well bore penetrating a subterranean formation. Additional methods are also provided.

Coated products and use thereof in oil fields

An oil field production chemical, especially a scale inhibitor, is in the form of particles thereof carrying a coating e.g. of a dispersing agent. The coating may be polymeric such as an oligomeric polyacid polyester, a polymeric alkoxylated alcohol or a fatty acid polyamine condensate or it may also be a surfactant and may be used in the form of a suspension in an inert oil, such as diesel oil or kerosene which may be injected into a subterranean formation to inhibit the formation of deposits, e.g. scale in oil wells over a longer period than compounds free of the coating.

Oil recovery method using an emulsion

The disclosed invention provides a method for recovering hydrocarbons from a subterranean formation by injecting an emulsion, comprising oil and water, into the formation. More specifically, the emulsion is stabilized using undissolved solid particles, which are preferably at least partially oleophilic. The solids-stabilized emulsion may be used either as a drive fluid for displacing hydrocarbons from the formation or to produce a barrier for diverting flow of fluids in the formation. Such solid particles may be either formation solid particles (i.e., indigenous to the formation) or nonformation solid particles (i.e., obtained from outside the formation). Nonformation solid particles may either be naturally occurring or synthetic. Some preferred solids include clays, quartz, feldspar, gypsum, coal dust, asphaltenes, and polymers. Carbon dioxide or another gas may be added to the emulsion to adjust the emulsion's viscosity to the desired level.

Coated products and use thereof in oil fields

An oil field production chemical, especially a scale inhibitor, is in the form of particles thereof carrying a coating e.g. of a dispersing agent. The coating may be polymeric such as an oligomeric polyacid polyester, a polymeric alkoxylated alcohol or a fatty acid polyamine condensate or it may also be a surfactant and may be used in the form of a suspension in an inert oil, such as diesel oil or kerosene which may be injected into a subterranean formation to inhibit the formation of deposits, e.g. scale in oil wells over a longer period than compounds free of the coating.

Method of plugging porous strata in wells

Downhole chemical delivery system for oil and gas wells

The invention is the method of treating of a well, a formation, or both, with the solids, liquids, or apparatuses, by 1) encasing the solids, liquids, or apparatuses in a water-soluble shell, 2) conveying the encased solids, liquids, or gases to the predetermined location in the well, and then 3) allowing the water-soluble shell to dissolve in the aqueous phase in the wellbore. The shell is preferably made of water-soluble polymers such as collagen, a crosslinking agent such as zolidine, optionally a hydrophobic compound such as a processed oil, and water used in processing. Other modifying or conditioning compounds, for example glycerin and other polymeric additives, may be incorporated to extend the strength or temperature range of the shell. The shell encases a variety of solids, liquids, or combinations thereof, where the solids or liquids are useful in the treatment of the well or of the producing formation. Illustrative encased material includes soap, acid, corrosion inhibitors, chelating agents, scale inhibitors, mutual solvents, paraffin inhibitors, paraffin dissolvers, clay stabilizers, and tracer materials. The encased materials may also be apparatuses, such as a prefabricated screen completion or a prefabricated sand-pack.