发明名称 |
Shut-in tools |
摘要 |
A downhole shut-in tool includes in one aspect a pilot valve which when opened places a differential pressure across a piston which in turn operably engages a shut-in valve element to close the shut-in tool. An electronic timer assembly and electric drive motor are provided for controlling the action of the pilot valve. The drive motor is controlled by a load sensor which senses that the motor has stalled when an actuator engages a movement limiting abutment. In another aspect a pilot valve is provided which can selectively communicate the pressure differential across the piston so as to repeatedly open and close the shut-in valve element. Efficient methods of drawdown and buildup testing using such an automated multiple operating shut-in tool are provided. Associated automated sampling tools are also disclosed.
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申请公布号 |
US5234057(A) |
申请公布日期 |
1993.08.10 |
申请号 |
US19920868832 |
申请日期 |
1992.04.14 |
申请人 |
HALLIBURTON COMPANY |
发明人 |
SCHULTZ, ROGER L.;ZITTERICH, CRAIG L.;BECK, HAROLD K.;BOHAN, WILLIAM L. |
分类号 |
E21B34/06;E21B34/08;E21B49/08 |
主分类号 |
E21B34/06 |
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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