发明名称 |
Casing hammer assembly for cable tool drilling apparatus |
摘要 |
A casing hammer assembly for a cable tool drilling apparatus and a cable tool drilling apparatus employing the casing hammer assembly. The casing hammer assembly includes a hammer housing which is positioned on a casing pipe and having a central aperture for through passage of a cable tool drilling string. An impact anvil is located in the housing, surrounding the central aperture, and a reciprocal hammer is mounted for striking the anvil. An eccentric arrangement is employed for raising the hammer for repeated striking of the anvil in order to sink the casing pipe. A hydraulic arm is utilized for laterally positioning the hammer housing in relation to the casing pipe.
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申请公布号 |
US6029757(A) |
申请公布日期 |
2000.02.29 |
申请号 |
US19970985071 |
申请日期 |
1997.12.04 |
申请人 |
ANDERSON, VAUGHN J.;ANDERSON, KENNETH W. J. |
发明人 |
ANDERSON, VAUGHN J.;ANDERSON, KENNETH W. J. |
分类号 |
E21B1/02;E21B7/20;E21B19/084;(IPC1-7):E21B1/00 |
主分类号 |
E21B1/02 |
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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