公开(公告)号：US11834606B2

公开(公告)日：2023-12-05

申请号：US17581392

申请日：2022-01-21

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 ,  E21B21/06 ,  C09K8/03 ,  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：US11753582B2

公开(公告)日：2023-09-12

申请号：US16635733

申请日：2018-07-31

Applicant: CHEVRON U.S.A. INC.

Inventor： Dustin L. Walker ,  Gayani W. Pinnawala ,  Nabijan Nizamidin ,  Varadarajan Dwarakanath ,  Guo-Qing Tang ,  Dustin J. Lowry ,  Tetsuo Art Inouye ,  Taimur Malik

IPC: C09K8/60 ,  E21B47/11 ,  C09K8/86 ,  E21B43/27 ,  C09K8/68 ,  C09K8/74 ,  C09K8/80 ,  E21B43/267

CPC classification number: C09K8/604 ,  C09K8/602 ,  C09K8/68 ,  C09K8/74 ,  C09K8/80 ,  C09K8/86 ,  E21B43/267 ,  E21B43/27 ,  E21B47/11 ,  C09K2208/10 ,  C09K2208/12 ,  C09K2208/26 ,  C09K2208/28 ,  C09K2208/32

Abstract: Described herein are compositions and methods that stabilize an injection fluid when exposed to reservoir conditions, reducing formation damage and increasing the amount of hydrocarbon recovered. Specifically, the formulation is a single-phase liquid surfactant package which comprises an anionic surfactant including a hydrophobic tail comprising from 6 to 60 carbon atoms and optionally one or more secondary surfactants.

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

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

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.

公开(公告)号：US11377586B2

公开(公告)日：2022-07-05

申请号：US16528183

申请日：2019-07-31

Applicant: Chevron U.S.A. Inc.

Inventor： Nabijan Nizamidin ,  Gayani W. Pinnawala ,  Guo-Qing Tang ,  Varadarajan Dwarakanath ,  Gregory A. Winslow ,  Jordan Taylor Isbell ,  Taimur Malik

IPC: C09K8/584 ,  C09K8/588 ,  C09K8/60 ,  C09K8/66 ,  C09K8/68 ,  C09K8/80 ,  E21B43/20 ,  E21B43/26 ,  E21B47/11

Abstract: Provided herein are compositions comprising borate-acid buffers, as well as methods of using these compositions in oil and gas operations, including enhanced oil recovery (EOR) operations, fracturing operations, stimulation operations, etc.

公开(公告)号：US20220145157A1

公开(公告)日：2022-05-12

申请号：US17581392

申请日：2022-01-21

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: C09K8/03

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：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

IPC: E21B43/38 ,  C09K8/588

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.