公开(公告)号：US20230257644A1

公开(公告)日：2023-08-17

申请号：US17920979

申请日：2021-04-26

Applicant: CHEVRON U.S.A. INC.

Inventor： Gayani W. PINNAWALA ,  Sujeewa S. PALAYANGODA ,  Gregory A. WINSLOW ,  Varadarajan DWARAKANATH ,  Kerry Kennedy SPILKER ,  Robert George SHONG

IPC: C09K8/584 ,  C09K8/60 ,  C09K8/68 ,  C09K8/588 ,  C07C57/13 ,  C07C309/22

CPC classification number: C09K8/584 ,  C09K8/604 ,  C09K8/68 ,  C09K8/588 ,  C07C57/13 ,  C07C309/22 ,  E21B43/26

Abstract: The present disclosure is directed to polyanionic surfactants, surfactant mixtures, compositions derived thereof, and uses thereof in hydrocarbon recovery. Methods of making polyanionic surfactants are also described.

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：US20230183578A1

公开(公告)日：2023-06-15

申请号：US17920977

申请日：2021-04-26

Applicant: CHEVRON U.S.A. INC.

Inventor： Gayani W. PINNAWALA ,  Sujeewa S. PALAYANGODA ,  Gregory A. WINSLOW ,  Varadarajan DWARAKANATH ,  Kerry Kennedy SPILKER ,  Robert George SHONG

IPC: C09K23/02 ,  C09K23/12 ,  C09K8/584 ,  C09K8/68

CPC classification number: C09K23/02 ,  C09K23/12 ,  C09K8/584 ,  C09K8/68

Abstract: The present disclosure is directed to polyanionic surfactants, surfactant mixtures, compositions derived thereof, and uses thereof in hydrocarbon recovery. Methods of making polyanionic surfactants are also described.

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.