发明名称 |
METHOD AND APPARATUS FOR DETERMINING DOWNHOLE PRESSURES DURING A DRILLING OPERATION |
摘要 |
A method and apparatus is provided to collect downhole data during a drilli ng operation via a downhole tool. A differential pressure is created by the difference between internal pressure of fluid passing through the downhole tool and the annular pressure in the wellbore. The apparatus includes a drill collar connectable to the downhole drilling, and has an opening extending into a chamber therein. A piston is positioned in the chamber and has a rod extending into the opening. The piston is movable between a closed position with the rod filling the opening, and an open position with the rod retracted into the chamber to form a cavity for receiving downhole fluid. A sensor is positioned in the rod for collecting data from fluid in the cavity. The apparatus may also be provided with a probe and/or hydraulic circuitry to facilitate the collection of data.
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申请公布号 |
CA2457650(A1) |
申请公布日期 |
2004.08.18 |
申请号 |
CA20042457650 |
申请日期 |
2004.02.12 |
申请人 |
SCHLUMBERGER CANADA LIMITED |
发明人 |
HOEFEL, ALBERT;CIGLENEC, REINHART |
分类号 |
E21B21/08;E21B47/06;E21B49/08;E21B49/10;(IPC1-7):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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