发明名称 |
Methods and systems for acidizing subterranean formations with treatment fluids containing dual-functioning chelating agents |
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. |
申请公布号 |
NO20151463(A1) |
申请公布日期 |
2015.10.28 |
申请号 |
NO20150001463 |
申请日期 |
2015.10.28 |
申请人 |
HALLIBURTON ENERGY SERVICES, INC. |
发明人 |
REYES ENRIQUE ANTONIO;SMITH ALYSSA LYNN;BEUTERBAUGH AARON M |
分类号 |
C09K8/72;C09K8/74;E21B43/27 |
主分类号 |
C09K8/72 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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