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公开(公告)号：US20240271031A1
公开(公告)日：2024-08-15
申请号：US18437942
申请日：2024-02-09
Applicant: CHEVRON U.S.A. INC.
Inventor： Do Hoon Kim , Dennis Arun Alexis , Varadarajan Dwarakanath , David Espinosa , Taimur Malik , Logan Jackson , Tom Lynch , Ronald Robinson , Frances Fournier , Hong Yang , Sukhjit Aujla
Abstract: Provided herein are liquid polymer (LP) compositions comprising a synthetic (co)polymer (e.g., an acrylamide (co)polymer), as well as methods for preparing inverted polymer solutions by inverting these LP compositions in an aqueous fluid. The resulting inverted polymer solutions can have a concentration of a synthetic (co)polymer (e.g., an acrylamide (co)polymer) of from 50 to 15,000 ppm, and a filter ratio of 1.5 or less at 15 psi using a 1.2 μm filter. Also provided are methods of using these inverted polymer solutions in oil and gas operations, including enhanced oil recovery.
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公开(公告)号：US20240174914A1
公开(公告)日：2024-05-30
申请号：US18336457
申请日：2023-06-16
Applicant: CHEVRON U.S.A. INC.
Inventor： Do Hoon Kim , Dennis Arun Alexis , Varadarajan Dwarakanath , David Espinosa , Taimur Malik , Logan Jackson , Tom Lynch , Ronald Robinson , Frances Fournier , Hong Yang , Sukhjit Aujla
Abstract: Provided herein are liquid polymer (LP) compositions comprising a synthetic (co)polymer (e.g., an acrylamide (co)polymer), as well as methods for preparing inverted polymer solutions by inverting these LP compositions in an aqueous fluid. The resulting inverted polymer solutions can have a concentration of a synthetic (co)polymer (e.g., an acrylamide (co)polymer) of from 50 to 15,000 ppm, and a filter ratio of 1.5 or less at 15 psi using a 1.2 μm filter. Also provided are methods of using these inverted polymer solutions in oil and gas operations, including enhanced oil recovery.
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Patent Agency Ranking
公开(公告)号：US11591893B2
公开(公告)日：2023-02-28
申请号：US17287734
申请日：2019-10-22
Applicant: CHEVRON U.S.A. INC.
Inventor： Sujeewa S. Palayangoda , Kerry Kennedy Spilker , Sumitra Subrahmanyan , Gayani W. Pinnawala , Sophany Thach , Gregory A. Winslow , Dennis Arun Alexis , Harold Charles Linnemeyer , Timothy P. Theriot , Les Leszek Jackowski , Francesca Cibotti
Abstract: Described herein are methods of treating fluid comprising hydrocarbons, water, and polymer being produced from a hydrocarbon-bearing formation are provided. The method can include adding a concentration of a viscosity reducer to the fluid to degrade the polymer present in the fluid and adding a concentration of a neutralizer to the fluid to neutralize the viscosity reducer in the fluid. The viscosity reducer is buffered at a pH of 7 or less (e.g., at a pH of from 2 to 7, such as at a pH of from 3.5 to 7, or at a pH of from 5 to 7). The addition of the concentration of the viscosity reducer is in a sufficient quantity to allow for complete chemical degradation of the polymer prior to the addition of the concentration of the neutralizer in the fluid such that excess viscosity reducer is present in the fluid. The addition of the concentration of the neutralizer is sufficiently upstream of any surface fluid processing equipment to allow for complete neutralization of the excess viscosity reducer such that excess neutralizer is present in the fluid prior to the fluid reaching any of the surface fluid processing equipment.
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公开(公告)号：US11299409B2
公开(公告)日：2022-04-12
申请号：US15781893
申请日：2016-12-07
Applicant: KEMIRA OYJ , CHEVRON U.S.A. INC.
Inventor： Logan Jackson , Thomas J. Lynch , Ronald Robinson , Frances Fournier , Hong Yang , Sukhjit Aujla , Do Hoon Kim , Dennis Arun Alexis , Varadarajan Dwarakanath , David Espinosa , Taimur Malik
IPC: D21H17/37 , C02F1/56 , C02F11/14 , C08J3/07 , C02F11/147 , C02F103/10
Abstract: Provided herein are liquid polymer (LP) compositions comprising an acrylamide (co)polymer, as well as methods for preparing inverted polymer solutions by inverting these LP compositions in an aqueous fluid. The resulting inverted polymer solutions can have a concentration of acrylamide (co)polymer of from about 50 to about 15,000 ppm, and a filter ratio of 1.5 or less at 15 psi using a 1.2 μm filter. Also provided are methods of using these inverted polymer solutions in dewatering, clarification, flocculation and/or thickening applications, and the like.
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公开(公告)号：US11242739B2
公开(公告)日：2022-02-08
申请号：US16660497
申请日：2019-10-22
Applicant: Chevron U.S.A. Inc.
Inventor： Sumitra Subrahmanyan , Gayani W. Pinnawala , Sophany Thach , Gregory A. Winslow , Dennis Arun Alexis , Harold Charles Linnemeyer , Timothy Peter Theriot , Les Leszek Jackowski , Francesca Cibotti
Abstract: Embodiments of treating fluid comprising hydrocarbons, water, and polymer being produced from a hydrocarbon-bearing formation are provided. One embodiment comprises adding a concentration of a viscosity reducer to the fluid to degrade the polymer present in the fluid and adding a concentration of a neutralizer to the fluid to neutralize the viscosity reducer in the fluid. The addition of the concentration of the viscosity reducer is in a sufficient quantity to allow for complete chemical degradation of the polymer prior to the addition of the concentration of the neutralizer in the fluid such that excess viscosity reducer is present in the fluid. The addition of the concentration of the neutralizer is sufficiently upstream of any surface fluid processing equipment to allow for complete neutralization of the excess viscosity reducer such that excess neutralizer is present in the fluid prior to the fluid reaching any of the surface fluid processing equipment.
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公开(公告)号：US09902894B2
公开(公告)日：2018-02-27
申请号：US14927084
申请日：2015-10-29
Applicant: Chevron U.S.A. Inc.
Inventor： Varadarajan Dwarakanath , Robert M. Dean , Do Hoon Kim , Dennis Arun Alexis , Sophany Thach , Taimur Malik , Anette Poulsen , Sumitra Subrahmanyan
Abstract: A method for making a polymer suspension for use in enhancing the production of oil from a formation is disclosed. In one embodiment, the method comprises mixing a powder polymer having an average molecular weight of 0.5 to 30 Million Daltons into a water soluble solvent having an HLB of greater than or equal to 8 for less than or equal to 24 hours. The water soluble solvent is selected from a group, at a weight ratio from 20:80 to 80:20. The polymer suspension is stable, pumpable, and substantially anhydrous; and it is hydrated for an injection solution in less than or equal to 4 hours, containing a polymer concentration ranging from 100 ppm to 50,000 ppm and having a filter ratio of less than or equal to 1.5 at 15 psi using a 1.2 μm filter, by mixing a sufficient amount of the polymer suspension in an aqueous fluid.
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公开(公告)号：US20160122626A1
公开(公告)日：2016-05-05
申请号：US14927078
申请日：2015-10-29
Applicant: Chevron U.S.A. Inc.
Inventor： Varadarajan Dwarakanath , Robert M. Dean , Do Hoon Kim , Dennis Arun Alexis , Sophany Thach , Taimur Malik , Anette Poulsen
Abstract: A method of enhancing oil recovery in a subterranean reservoir is disclosed. In one embodiment, the method comprises providing a wellbore and a polymer suspension. The polymer suspension comprises a powder polymer having an average molecular weight of 0.5 to 30 Million Daltons suspended in a water soluble solvent having an HLB of greater than or equal to 8 and selected from a group, at a weight ratio of 20:80 to 80:20. The method comprises providing an aqueous fluid, mixing a sufficient amount of the polymer suspension in the aqueous fluid for the polymer to be hydrated resulting an injection solution in less than or equal to 4 hours, and injecting the injection solution into the wellbore. The injection solution contains a polymer concentration ranging from 100 ppm to 50,000 ppm and has a filter ratio of less than 1.5 at 15 psi using a 1.2 μm filter.
Abstract translation: 公开了一种提高地下储层中油回收率的方法。 在一个实施方案中，该方法包括提供井眼和聚合物悬浮液。 聚合物悬浮液包含悬浮在HLB大于或等于8的水溶性溶剂中的平均分子量为0.5至30百万道尔顿的粉末聚合物，并且选自重量比为20:80至80 ：20。 该方法包括提供水性流体，将足够量的聚合物悬浮液混合在水性流体中以供待水合的聚合物在少于或等于4小时内产生注射溶液，并将注入溶液注入井眼。 注射溶液的聚合物浓度范围为100ppm至50,000ppm，并且在15psi下使用1.2μm的过滤器具有小于1.5的过滤比。
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