| 发明名称 |
STEERABLE DRILLING SYSTEM |
| 摘要 |
<p num="1">A steerable drilling system comprises a bias unit 14 operable by means of a control valve arrangement 22, the control valve arrangement 22 comprising a rotary valve 24 having a control shaft 28 the angular position of which is controlled by a motor 30.
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| 申请公布号 |
CA2545765(C) |
申请公布日期 |
2013.04.30 |
| 申请号 |
CA20062545765 |
申请日期 |
2006.05.03 |
| 申请人 |
SCHLUMBERGER CANADA LIMITED |
发明人 |
DOWNTON, GEOFF;HALE, NIGEL |
| 分类号 |
E21B7/04;E21B7/06;E21B17/10 |
主分类号 |
E21B7/04 |
| 代理机构 |
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