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Methods and systems for acidizing subterranean formations with treatment fluids containing dual-functioning chelating agents
Methods and systems for acidizing subterranean formations with treatment fluids containing dual-functioning chelating agents
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机译:用含有双重功能螯合剂的处理液酸化地下岩层的方法和系统
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摘要
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 pKa value for one or more of the carboxylic acid groups, complexing a metal ion with the chelating agent.
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机译:当在通常会发生金属离子络合的pH值范围之外使用时,氨基聚羧酸可减缓酸与碳酸盐矿物的反应速率。用于处理地下岩层的方法可以包括:提供一种处理液,该处理液包括水性载液,酸和包含氨基聚羧酸的螯合剂,该处理液的pH低于该螯合剂的羧酸根所在的pH。基本上质子化并且螯合剂对于络合金属离子无效;将处理液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,使得酸至少部分消耗并且处理液的pH升高;并且一旦处理液的pH值上升到一个或多个羧酸基团的pK a Sub>值以上,就会使金属离子与螯合剂络合。
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