| 发明名称 |
Casing clamp |
| 摘要 |
A clamp for gripping casing strings is disclosed. A series of radially arranged spring biased slips are mounted in a housing attached to a top drive. A hydraulic system is used to release the slips from the gripping position upon a casing string.
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| 申请公布号 |
US6311792(B1) |
申请公布日期 |
2001.11.06 |
| 申请号 |
US19990414482 |
申请日期 |
1999.10.08 |
| 申请人 |
TESCO CORPORATION |
发明人 |
SCOTT STEPHEN F.;NIKIFORUK KEVIN |
| 分类号 |
E21B19/10;E21B33/04;(IPC1-7):E21B17/02 |
主分类号 |
E21B19/10 |
| 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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