METHOD FOR ENHANCED OIL RECOVERY, USING MODIFIED NONIONIC SURFACTANT FORMULATIONS

    公开(公告)号:EP2718389B1

    公开(公告)日:2018-10-31

    申请号:EP12730092.9

    申请日:2012-06-08

    IPC分类号: C09K8/584 C09K8/594

    摘要: Embodiments of the present disclosure include modified nonionic surfactant formulations having a nonionic surfactant and a pour point depressant, where the modified nonionic surfactant formulations have a pour point of −3° C. to −54° C. In one or more embodiments, the modified nonionic surfactant formulations can be introduced into a flow of carbon dioxide, where the flow of carbon dioxide and the modified nonionic surfactant formulation are injected into an oil containing reservoir. In one or more embodiments, an emulsion of the carbon dioxide and the nonionic surfactant form in the oil containing reservoir, where the use of the pour point depressant provides minimal interference in forming the emulsion.

    SAPONIFIED FATTY ACIDS AS BREAKERS FOR VISCOELASTIC SURFACTANT-GELLED FLUIDS
    9.
    发明公开
    SAPONIFIED FATTY ACIDS AS BREAKERS FOR VISCOELASTIC SURFACTANT-GELLED FLUIDS 审中-公开
    皂化脂肪作为断路器粘弹性,TENSIDGELIERTE液体的

    公开(公告)号:EP1869139A1

    公开(公告)日:2007-12-26

    申请号:EP06738689.6

    申请日:2006-03-16

    发明人: CREWS, James, B.

    IPC分类号: C09K8/70 C09K8/68

    摘要: Fluids viscosified with viscoelastic surfactants (VESs) may have their viscosities affected (increased or reduced, e.g. gels broken) by the indirect or direct action of a composition that contains at least one fatty acid that has been affected, modified or reacted with an alkali metal base, an alkali earth metal base, ammonium base, and/or organic base compound, optionally with an alkali metal halide salt, an alkali earth metal halide salt, and/or an ammonium halide salt. The composition containing the resulting saponification product is believed to either act as a co-surfactant with the VES itself to increase viscosity and/or possibly by disaggregating or otherwise affecting the micellar structure of the VES-gelled fluid. In a specific, non-limiting instance, a brine fluid gelled with an amine oxide surfactant may have its viscosity broken with a composition containing naturally-occurring fatty acids in canola oil or corn oil affected with CaOH, MgOH, NaOH and the like.