发明名称 |
Method and apparatus for riserless drilling |
摘要 |
An offshore riserless drilling system drills a subsea borehole from a platform and through a cased borehole. The system comprises a lightweight drill string suspending a bottomhole assembly and extending from the platform downwardly through a depth of water into the cased borehole; a first limiter limiting the range of motion of the drill string adjacent the platform; and a second limiter limiting the range of motion of the drill string adjacent the cased borehole. The preferred methods include lowering a bottomhole assembly suspended on a lightweight drill string from a platform through a depth of water; limiting the bend radius of the drill string adjacent the platform; guiding the bottomhole assembly into a cased borehole; limiting the bend radius of the drill string adjacent the cased borehole; maintaining the bottomhole assembly in the cased borehole, and drilling the subsea borehole.
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申请公布号 |
US7150324(B2) |
申请公布日期 |
2006.12.19 |
申请号 |
US20020264549 |
申请日期 |
2002.10.04 |
申请人 |
HALLIBURTON ENERGY SERVICES, INC. |
发明人 |
LAURSEN PATRICK EMMETT;MUNGALL JOHN CHRISTIAN HARTLEY |
分类号 |
E21B29/12;E21B7/128;E21B19/24 |
主分类号 |
E21B29/12 |
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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