发明名称 |
CIRCULATION SUB AND METHOD FOR USING SAME |
摘要 |
Techniques for continuously circulating fluid into a drill string are disclosed. These techniques involve a circulation sub (108) including a tubular and a diverter valve (200A). The tubular has a first end connectable to the drill string, a second end connectable to a pipe segment, and a port (220) therein. The tubular has a fluid path (202) for allowing the fluid to flow from the pipe segment to the drill string and a circulation path (204) for allowing the fluid to flow from the port to the drill string. The diverter valve has a channel therethrough in selective fluid communication with the fluid path. The diverter valve is positionable between a flow through position for selectively allowing the fluid to flow through the fluid path and a diversion position for selectively allowing the fluid to flow through the circulation path whereby the fluid may continuously flow through the drill string. |
申请公布号 |
EP2591202(A1) |
申请公布日期 |
2013.05.15 |
申请号 |
EP20110732553 |
申请日期 |
2011.07.07 |
申请人 |
NATIONAL OILWELL VARCO, L.P. |
发明人 |
WEIR, JAMES, WILLIAM;SHELTON, ANDREW |
分类号 |
E21B21/10;E21B33/068;F16K15/18 |
主分类号 |
E21B21/10 |
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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