发明名称 |
Ball Operated Back Pressure Valve |
摘要 |
A method for selectively closing a downhole one way check valve, the method having the following steps: attaching the valve to a casing; locking the valve in an open configuration; running the casing and the valve into the wellbore; reverse circulating a composition down an annulus defined between the casing and the wellbore; injecting a plurality of balls into the annulus; unlocking the valve with the plurality of balls; and closing the valve.
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申请公布号 |
US2008164028(A1) |
申请公布日期 |
2008.07.10 |
申请号 |
US20070619779 |
申请日期 |
2007.01.04 |
申请人 |
WINSLOW DONALD;BRANCH ALTON |
发明人 |
WINSLOW DONALD;BRANCH ALTON |
分类号 |
E21B33/13 |
主分类号 |
E21B33/13 |
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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