发明名称 |
METHOD FOR MAINTAINING WELLBORE PRESSURE |
摘要 |
A method for maintaining wellbore pressure includes reducing flow rate of a drilling fluid pump fluidly connected to a drill pipe in the wellbore. Flow out of the well is enabled into a first auxiliary line associated with a drilling riser. A seal around the drill pipe is closed. Fluid is pumped down a second auxiliary line at a rate selected to maintain a specific pressure in the wellbore. Drilling fluid flow through the drill pipe is stopped. |
申请公布号 |
EP2553209(A4) |
申请公布日期 |
2015.05.06 |
申请号 |
EP20110763318 |
申请日期 |
2011.03.29 |
申请人 |
PRAD RESEARCH AND DEVELOPMENT LIMITED |
发明人 |
REITSMA, DONALD, G.;SEHSAH, OSSAMA, RAMZI |
分类号 |
E21B21/08;E21B7/12;E21B47/06 |
主分类号 |
E21B21/08 |
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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