发明授权
- 专利标题： Buffered well fluids
- 专利标题（中）： 缓冲液体
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申请号： US09910424申请日： 2001-07-20
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公开(公告)号： US06499546B1公开(公告)日： 2002-12-31
- 发明人: Michael A. Freeman , Taylor Caldwell Green, III
- 申请人： Michael A. Freeman , Taylor Caldwell Green, III
- 主分类号： E21B3708
- IPC分类号： E21B3708
摘要：
The present invention relates to the use of a buffered acid wash to reduce the amount of oil in cuttings associated with the use of an invert emulsion well fluid. The buffered acid wash is sufficiently acidic as to convert all of the surfactant in the invert oil emulsion from one charge species into another, but substantially prevents the fluid from becoming so acidic as to generate carbon dioxide.
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