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    • 2. 发明申请
    • METHODS AND SYSTEMS FOR ACIDIZING SUBTERRANEAN FORMATIONS WITH TREATMENT FLUIDS CONTAINING DUAL-FUNCTIONING CHELATING AGENTS
    • 用含有双功能螯合剂的处理液酸化亚硝酸盐的方法和系统
    • WO2014209649A1
    • 2014-12-31
    • PCT/US2014/042479
    • 2014-06-16
    • HALLIBURTON ENERGY SERVICES, INC.
    • REYES, Enrique AntonioSMITH, Alyssa LynnBEUTERBAUGH, Aaron M.
    • C09K8/72C09K8/035E21B43/22
    • C09K8/72C09K8/74E21B43/283
    • When used outside the pH range at which metal ion complexation normally occurs, aminopolycarboxylic acids can moderate the reaction rate of acids with carbonate minerals. Methods for treating a subterranean formation can comprise: providing a treatment fluid comprising an aqueous carrier fluid, an acid, and a chelating agent comprising an aminopolycarboxylic acid, the treatment fluid having a pH below that at which the carboxylic acid groups of the chelating agent are substantially protonated and the chelating agent is ineffective for complexing a metal ion; introducing the treatment fluid into a subterranean formation comprising a carbonate mineral; reacting the acid with the carbonate mineral, such that the acid at least partially spends and the pH of the treatment fluid rises; and once the pH of the treatment fluid rises above a pK a value for one or more of the carboxylic acid groups, complexing a metal ion with the chelating agent.
    • 当在通常发生金属离子络合的pH范围之外使用时,氨基多羧酸可以调节酸与碳酸盐矿物的反应速率。 用于处理地下地层的方法可以包括:提供包含含水载体流体,酸和包含氨基多羧酸的螯合剂的处理流体,所述处理流体的pH低于螯合剂的羧酸基团的pH 基本上质子化,并且螯合剂对金属离子络合是无效的; 将处理流体引入包含碳酸盐矿物的地下地层中; 使酸与碳酸盐矿物反应,使得酸至少部分地消耗并且处理液的pH升高; 并且一旦处理液的pH升高到一个或多个羧酸基团的pKa值以上,则与螯合剂络合金属离子。