公开(公告)号：US20210395602A1

公开(公告)日：2021-12-23

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

IPC: C09K8/588 ,  E21B21/06 ,  E21B43/38

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 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.

公开(公告)号：US20220290031A1

公开(公告)日：2022-09-15

申请号：US17635222

申请日：2020-08-14

Applicant: Chevron U.S.A. Inc.

Inventor： Ruth Ellen HAHN ,  Varadarajan DWARAKANATH ,  Kerry SPILKER ,  Gregory A. WINSLOW ,  Sophany THACH ,  Gayani W. PINNAWALA ,  Christopher GRIFFITH ,  Harold Charles LINNEMEYER ,  Robert Neil TROTTER

IPC: C09K8/38 ,  C09K8/60 ,  C09K8/94 ,  C09K8/584

Abstract: Described herein are aqueous based foams for use in drilling operations. The foams can be used in below bubble point drilling operations to control the migration of reservoir gases (e.g., hydrogen sulfide) to the surface.

公开(公告)号：US20190323324A1

公开(公告)日：2019-10-24

申请号：US16387619

申请日：2019-04-18

Applicant: Chevron U.S.A. Inc.

Inventor： Soumyadeep GHOSH ,  Nariman Fathi NAJAFABADI ,  Adwait CHAWATHE ,  Sophany THACH ,  Anil AMBASTHA

IPC: E21B41/00 ,  C09K8/588 ,  G06N5/02 ,  E21B43/16

Abstract: One embodiment includes generating a polymer partitioning model that determines a concentration of the polymer in a brine phase of the microemulsion system and a concentration of the polymer in an aqueous component of a microemulsion phase of the microemulsion system. The embodiment includes determining a viscosity of the brine phase of the microemulsion system using the concentration of the polymer in the brine phase of the microemulsion system, determining a viscosity of the aqueous component of the microemulsion phase of the microemulsion system using the concentration of the polymer in the aqueous component of the microemulsion phase of the microemulsion system, and determining a viscosity of the microemulsion phase of the microemulsion system using the viscosity of the aqueous component of the microemulsion phase of the microemulsion system. The embodiment includes using determined viscosities to determine performance of a chemical enhanced oil recovery process scenario.

公开(公告)号：US20240067865A1

公开(公告)日：2024-02-29

申请号：US18496600

申请日：2023-10-27

Applicant: CHEVRON U.S.A. INC.

Inventor： Sumitra SUBRAHMANYAN ,  Gayani W. PINNAWALA ,  Sophany THACH ,  Gregory A. WINSLOW ,  Dennis A. ALEXIS ,  Harold C. LINNEMEYER ,  Timothy P. THERIOT ,  Les Leszek JACKOWSKI ,  Francesca CIBOTTI

IPC: C09K8/588 ,  C09K8/03 ,  E21B21/06 ,  E21B43/38

CPC classification number: C09K8/588 ,  C09K8/032 ,  E21B21/068 ,  E21B43/385 ,  C09K2208/26 ,  C09K2208/28

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.

公开(公告)号：US20230323193A1

公开(公告)日：2023-10-12

申请号：US18160710

申请日：2023-01-27

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

IPC: C09K8/588 ,  E21B21/06 ,  C09K8/03 ,  E21B43/38

CPC classification number: C09K8/588 ,  E21B21/068 ,  C09K8/032 ,  E21B43/385 ,  C09K2208/26 ,  C09K2208/28

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 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.

公开(公告)号：US20190153299A1

公开(公告)日：2019-05-23

申请号：US16259247

申请日：2019-01-28

Applicant: Chevron U.S.A. Inc.

Inventor： Robert George SHONG ,  Varadarajan DWARAKANATH ,  Gregory A. WINSLOW ,  Sophany THACH

IPC: C09K8/584 ,  C09K8/588 ,  C07C59/305 ,  E21B43/16

Abstract: The present disclosure relates to the use of a multicarboxylate, such as an alkyl alkoxy dicarboxylate, in enhanced oil recovery processes. Embodiments relate to an aqueous stream and the use thereof. The aqueous stream includes a compound having the chemical formula: R1-R2-R3, wherein R1 includes a branched or unbranched, saturated or unsaturated, cyclic or non-cyclic, hydrophobic carbon chain having an oxygen atom linking R1 and R2; R2 includes an alkoxylated chain comprising ethylene oxide, propylene oxide, butylene oxide, or a combination thereof; and R3 includes a branched or unbranched hydrocarbon chain and 2-5 —COOH or —COOM groups wherein M is a monovalent, divalent, or trivalent cation. R3 includes 2-12 carbon atoms.