发明名称 |
Closed-loop control of hydraulic pressure in a downhole steering tool |
摘要 |
Aspects of this invention include a steering tool having a controller configured to provide closed-loop control of hydraulic fluid pressure. In one exemplary embodiment, closed-loop control of a system (reservoir) pressure may be provided. In another embodiment, closed-loop control of a blade pressure may be provided while the blade remains substantially locked at a predetermined position. Other exemplary embodiments may incorporate rule-based-intelligence such that pressure control thresholds may be determined based on various measured and/or predetermined downhole parameters. The invention tends to reduce the friction (drag) between the blades and the borehole wall and thereby also tends to improve drilling rates. Moreover, the invention also tends to improve the service life and reliability of downhole steering tools.
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申请公布号 |
US2008110674(A1) |
申请公布日期 |
2008.05.15 |
申请号 |
US20060595054 |
申请日期 |
2006.11.09 |
申请人 |
PATHFINDER ENERGY SERVICES, INC. |
发明人 |
JONES STEPHEN;SUGIURA JUNICHI |
分类号 |
E21B7/04;E21B7/08;E21B44/00;G05D16/00 |
主分类号 |
E21B7/04 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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