Method for modifying the water permeability of a subterranean formation

    公开(公告)号:US12098325B2

    公开(公告)日:2024-09-24

    申请号:US17422838

    申请日:2020-01-29

    Applicant: SNF GROUP

    CPC classification number: C09K8/588 C08F220/56

    Abstract: The present invention relates to a method for modifying the water permeability of a subterranean formation which comprises oil, said method comprising at least the following steps:



    Preparing an injection fluid from a dispersion of a hydrophilic phase in a lipophilic phase, with water or brine, the dispersion comprising:

    a hydrophilic phase comprising at least one linear (co)polymer E,
    a lipophilic phase,
    at least one interface polymer composed of at least one monomer of formula (I):












    Injecting the injection fluid into the subterranean formation, comprising a linear (co)polymer E concentration, such that when released and in contact with water, the viscosity of the injection fluid is greater than the viscosity of the oil in the formation.

    SYSTEMS AND METHODS FOR LOWERING WATER CONCENTRATION IN POLYACRYLAMIDE-BASED EMULSIONS

    公开(公告)号:US20240109992A1

    公开(公告)日:2024-04-04

    申请号:US17726372

    申请日:2022-04-21

    Abstract: A polyacrylamide-based AMPS (2-acrylamido-2-methylpropane sulfonic acid) copolymer or terpolymer emulsion system may comprise 5-50% solid AMPS salt by weight of a polymer backbone in an emulsion polymerization, wherein use of solid AMPS salt reduces a total amount of water in the emulsion system. The polymer concentration may be above 35% by weight and the water concentration is below 31% by weight. Solid AMPS salt may be dissolved in acrylamide 50% solution, either with or without monomers, to control the total amount of water in an emulsion that may be formed, particularly to lower the water concentration. Use of solid AMPS salt dissolved in acrylamide 50% solution may introduce the AMPS monomer into an emulsion system without requiring addition of extra water. This may improve performance on the polymer backbone as well as the finished emulsion system.

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