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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| SY/T 6543.2-2009 |
Technology specification for underbalanced drilling. Part: Gas phase 欠平衡钻井技术规范 第2部分：气相 |
China Oil & Gas Industry
Standards Technology specification underbalanced |
 English PDF |
| SY/T 6543.1-2008 |
Technology specification for underbalanced drilling. Part 1: Liquid phase 欠平衡钻井技术规范 第1部分：液相 |
China Oil & Gas Industry
Standards Technology specification underbalanced |
English PDF |
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