发明名称 |
DIRECTIONAL DRILLING APPARATUS AND METHOD |
摘要 |
A directional drilling apparatus and method in which the drill bit is coupled to the lower end of a drill string through a universal joint which allows the bit to pivot relative to the string axis. The bit is contra-nutated in an orbit of fixed radius and at a rate equal to string rotation but in the opposite direction. This speed-controlled and phase-controlled bit nutation keeps the bit heading off-axis in a fixed direction. The invention enables directional drilling while the drill string rotates normally.
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申请公布号 |
CA2002135(C) |
申请公布日期 |
1999.02.02 |
申请号 |
CA19892002135 |
申请日期 |
1989.11.02 |
申请人 |
DIRECTIONAL DRILLING DYNAMICS LTD |
发明人 |
NOBLE, JAMES BAIN |
分类号 |
E21B4/20;E21B7/06;E21B7/08;(IPC1-7):E21B7/04 |
主分类号 |
E21B4/20 |
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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