发明名称 |
SUBSEA MASTER VALVE FOR USE IN WELL TESTING |
摘要 |
<p>In accordance with illustrative embodiments of the present invention, a new and improved subsea test tree includes a hydraulically operable control unit and shut-in valve unit that are releasably latched together. The control unit includes an integral retainer valve system at the upper end thereof. The main shut-in valve, which is a ball valve, is a fail-close device under the influence of a spring and nitrogen pressure. Additional assistance in closing the valve may be provided if needed by hydraulic pressure applied to a surface control line. Internal pressure may be vented prior to unlatching the control unit in case of an emergency.</p> |
申请公布号 |
EP0204619(A3) |
申请公布日期 |
1988.06.01 |
申请号 |
EP19860401136 |
申请日期 |
1986.05.29 |
申请人 |
SCHLUMBERGER TECHNOLOGY CORPORATION |
发明人 |
DOREMUS, BERNARD;MEEK, DALE E. |
分类号 |
E21B34/00;E21B34/04;F16K5/06;(IPC1-7):E21B34/04 |
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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