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    Multicarboxylate compositions and method of making the same
    11.
    发明授权
    Multicarboxylate compositions and method of making the same 有权

    公开(公告)号：US09976072B2

    公开(公告)日：2018-05-22

    申请号：US14668147

    申请日：2015-03-25

    Applicant: Chevron U.S.A. Inc.

    Inventor： Robert George Shong ,  Varadarajan Dwarakanath ,  Gregory A. Winslow ,  Sophany Thach

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

    CPC classification number: C09K8/584 ,  C07C59/305 ,  C09K8/588 ,  E21B43/16

    Abstract: The present disclosure generally relates to a multicarboxylate, such as an alkyl alkoxy dicarboxylate a method of making the multicarboxylate, and methods to use the multicarboxylate. A specific embodiment of the disclosure is a compound comprising the chemical formula: R1-R2-R3, wherein R1 comprises a branched or unbranched, saturated or unsaturated, cyclic or non-cyclic, hydrophobic carbon chain having 7-150 carbon atoms; an oxygen atom linking R1 and R2; R2 comprises an alkoxylated chain comprising ethylene oxide, propylene oxide, butylene oxide, or a combination thereof; and R3 comprises a branched or unbranched hydrocarbon chain comprising 2-12 carbon atoms and 2-5 —COOH or —COOM groups wherein M is a monovalent, divalent, or trivalent cation. The composition has a variety of uses but in some embodiments may be used in enhanced oil recovery processes.

    PH control in fluid treatment
    17.
    发明授权
    PH control in fluid treatment 有权

    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.

    TREATING FLUID COMPRISING HYDROCARBONS, WATER, AND POLYMER
    19.
    发明申请
    TREATING FLUID COMPRISING HYDROCARBONS, WATER, AND POLYMER 有权

    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.

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