| 发明名称 |
DRILLING SYSTEM WITH DRILL STRING VALVES |
| 摘要 |
A method to control borehole fluid flow includes detecting a drilling condition and operating at least one valve in the drill string to place an exterior of the drill string in fluid communication with an interior of the drill string in response to detecting the drilling condition.
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| 申请公布号 |
US2009272580(A1) |
申请公布日期 |
2009.11.05 |
| 申请号 |
US20080113539 |
申请日期 |
2008.05.01 |
| 申请人 |
SCHLUMBERGER TECHNOLOGY CORPORATION |
发明人 |
DOLMAN LEE F.;JEFFRYES BENJAMIN P.;JOHNSON ASHLEY B.;CLARK BRIAN;MCCULLAGH JOHN A. |
| 分类号 |
E21B21/08 |
主分类号 |
E21B21/08 |
| 代理机构 |
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代理人 |
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