发明名称 Apparatus and method for measuring formation pressure using a nozzle
摘要 A method for measuring a downhole formation pressure is disclosed which includes lowering a formation testing tool to a desired measuring position in a well borehole. Then a nozzle in the tool is extended so that the nozzle extends through the mud cake layer on a surface of a formation, forming a seal between the mud cake layer and a sealing surface of the nozzle. In an embodiment of the invention, the nozzle has a porous tip that extends into the invaded zone beyond the mudcake layer and is exposed to the formation pressure. In an alternate embodiment, the nozzle has a retractable tip that retracts into the nozzle. The nozzle and retractable tip are positioned in the mudcake and the retractable tip is retracted into the nozzle. The formation pressure is then communicated through the nozzle to a pressure sensor operatively connected to the nozzle.
申请公布号 US6769296(B2) 申请公布日期 2004.08.03
申请号 US20020109414 申请日期 2002.03.28
申请人 SCHLUMBERGER TECHNOLOGY CORPORATION 发明人 MONTALVO LAURA A.;KURKJIAN ANDREW L.;SUNDQUIST ROBERT WAYNE
分类号 E21B49/08;E21B47/06;E21B49/10;(IPC1-7):E21B49/10;E21B49/00 主分类号 E21B49/08
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