发明名称 |
PULL-DOWN METHOD AND EQUIPMENT FOR INSTALLING WELL CASING |
摘要 |
<p>A drilling rig having a top drive has a pipe gripper with a mandrel having an upper end for connection to and rotation with a drive string extending downward from the top drive. The pipe gripper has gripping elements that move radially into engagement with a string of pipe. A pull-down mechanism is mounted to the rig and secured to a non-rotating portion of the pipe gripper for exerting a downward force on the mandrel. A sensor is operatively coupled to the top drive to sense weight being supported by the top drive. A controller is linked to the sensor and the pull-down mechanism for controlling the downward force exerted on the mandrel by the pull-down mechanism in response to the weight sensed by the sensor.</p> |
申请公布号 |
CA2799429(A1) |
申请公布日期 |
2011.11.17 |
申请号 |
CA20112799429 |
申请日期 |
2011.05.13 |
申请人 |
TESCO CORPORATION |
发明人 |
NEIDHARDT, DIETMAR J.;NIKIFORUK, KEVIN J. |
分类号 |
E21B19/08;E21B3/02;E21B15/00;E21B19/06 |
主分类号 |
E21B19/08 |
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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