发明名称 |
METHOD AND APPARATUS FOR REDUCING STICK-SLIP |
摘要 |
<p>A method and apparatus for damping stick-slip oscillations in a drill string. In one embodiment a method includes damping the stick-slip oscillations using a drilling mechanism at the top of said drill string. The speed of rotation of the drilling mechanism is controlled using a PI controller. The control is characterised by tuning the PI controller so that the drilling mechanism absorbs most torsional energy from the drill string at a frequency that is at or near a frequency of the stick-slip oscillations.</p> |
申请公布号 |
EP2364397(A1) |
申请公布日期 |
2011.09.14 |
申请号 |
EP20080875686 |
申请日期 |
2008.12.02 |
申请人 |
NATIONAL OILWELL VARCO, L.P. |
发明人 |
KYLLINGSTAD, AAGE |
分类号 |
E21B44/00 |
主分类号 |
E21B44/00 |
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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