Drill string check valve |
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| 申请号 | US14361235 | 申请日 | 2012-11-27 | 公开(公告)号 | US10088064B2 | 公开(公告)日 | 2018-10-02 |
| 申请人 | Churchill Drilling Tools Limited; | 发明人 | Andrew Churchill; | ||||
| 摘要 | A drilling method comprising running a drill string (12) part way into a bore (11); then pumping fluid through the drill string; then running the drill string further into the bore; and then reconfiguring a check valve (20) located towards the distal end of the drill string from a running configuration, in which the valve permits flow both up and down the string, to a drilling configuration in which the valve permits flow down through the string but prevents flow up through the string. | ||||||
| 权利要求 | |||||||
| 说明书全文 | |||||||
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