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    • 4. 发明申请
    • METHODS AND COMPOSITIONS FOR VISCOSIFYING HEAVY AQUEOUS BRINES
    • 用于粘稠重质水的方法和组合物
    • WO2010141099A2
    • 2010-12-09
    • PCT/US2010/001633
    • 2010-06-04
    • RHODIA OPERATIONSKESAVAN, SubramanianDAHANAYAKE, Manilal, S.WOODWARD, Gary
    • KESAVAN, SubramanianDAHANAYAKE, Manilal, S.WOODWARD, Gary
    • C09K8/68
    • C09K8/08C09K8/40C09K8/665C09K8/68C09K8/90
    • A method for viscosifying brine systems utilized in oilfield applications comprising: a) preparing a heavy brine system comprising obtaining an aqueous brine system comprising a hydrated polysaccharide and at least one multivalent salt, wherein the density of the aqueous brine system is greater than about 10 pounds per gallon (ppg), and adding an effective amount of an alkaline agent, thereby increasing the viscosity of the brine system. Also disclosed are methods for viscosifying brine systems utilized in well servicing applications comprising obtaining an aqueous brine solution comprising at least one multivalent salt, wherein the density of the aqueous brine system is greater than about 10 pounds per gallon (ppg); adding a polysaccharide; adding an effective amount of an acid buffering agent to the brine system to lower the pH of the brine system, whereby the polysaccharide is capable of substantially hydrating into the brine system; and adding an effective amount of an alkaline agent, thereby substantially increasing the viscosity of the brine system.
    • 一种用于在油田应用中使用的盐水系统的增稠方法,包括:a)制备重盐水系统,其包括获得包含水合多糖和至少一种多价盐的含水盐水系统,其中所述含水盐水系统的密度大于约10磅 每加仑(ppg),并加入有效量的碱性试剂,从而提高盐水系统的粘度。 还公开了用于在井服务应用中使用的用于增稠盐水系统的方法,包括获得包含至少一种多价盐的盐水水溶液,其中所述含水盐水系统的密度大于约10磅/加仑(ppg); 加入多糖; 向盐水系统中加入有效量的酸缓冲剂以降低盐水系统的pH,由此多糖能够基本上水合进盐水系统; 并添加有效量的碱性试剂,从而显着提高盐水系统的粘度。