发明名称 |
METHODS AND SYSTEMS FOR ACIDIZING SUBTERRANEAN FORMATIONS |
摘要 |
A method for acidizing subterranean formations may include providing a treatment fluid comprising an aqueous carrier fluid, an acid, and a chelating agent comprising N-(phosphonomethyl)iminodiacetic acid, the treatment fluid having a pH at or below that at which carboxylic or phosphonic acid groups of the N-(phosphonomethyl)iminodiacetic acid are protonated and the chelating agent is ineffective for complexing a metal ion; introducing the treatment fluid into a wellbore penetrating a subterranean formation comprising a carbonate mineral; reacting the acid with the carbonate mineral in the presence of the chelating agent, such that the acid at least partially spends as the pH of the treatment fluid rises; and complexing a metal ion with the chelating agent once the pH of the treatment fluid rises above a pKa value for one or more of the carboxylic or phosphonic acid groups of the N-(phosphonomethyl)iminodiacetic acid. |
申请公布号 |
US2016264852(A1) |
申请公布日期 |
2016.09.15 |
申请号 |
US201314394826 |
申请日期 |
2013.12.13 |
申请人 |
HALLIBURTON ENERGY SERVICES, INC. |
发明人 |
Beuterbaugh Aaron Michael;Reyes Enrique Antonio;Smith Alyssa |
分类号 |
C09K8/74;E21B43/25 |
主分类号 |
C09K8/74 |
代理机构 |
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代理人 |
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主权项 |
1. A method comprising:
providing a treatment fluid comprising an aqueous carrier fluid, an acid, and a chelating agent comprising N-(phosphonomethyl)iminodiacetic acid, the treatment fluid having a pH at or below that at which carboxylic or phosphonic acid groups of the N-(phosphonomethyl)iminodiacetic acid are protonated and the chelating agent is ineffective for complexing a metal ion; introducing the treatment fluid into a wellbore penetrating a subterranean formation comprising a carbonate mineral; reacting the acid with the carbonate mineral in the presence of the chelating agent, such that the acid at least partially spends as the pH of the treatment fluid rises; and complexing a metal ion with the chelating agent once the pH of the treatment fluid rises above a pKa value for one or more of the carboxylic or phosphonic acid groups of the N-(phosphonomethyl)iminodiacetic acid. |
地址 |
Houston TX US |