发明名称 |
Annulus pressure responsive downhole tool. |
摘要 |
<p>An annulus pressure responsive well tool (10) includes a selectively actuatable hydraulic bypass (240) for bypassing a pressure differential across a power piston (142) of the tool so that an operating element (70) associated with the power piston (142) will remain in a chosen position during a subsequent change in well annulus pressure. <IMAGE> <IMAGE> <IMAGE></p> |
申请公布号 |
EP0539020(A1) |
申请公布日期 |
1993.04.28 |
申请号 |
EP19920308552 |
申请日期 |
1992.09.18 |
申请人 |
HALLIBURTON COMPANY |
发明人 |
MANKE, KEVIN R.;RINGGENBERG, PAUL D.;SCHULTZ, ROGER L. |
分类号 |
E21B34/00;E21B34/10;E21B49/08;E21B23/00 |
主分类号 |
E21B34/00 |
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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