发明名称 |
Methods to detect formation pressure |
摘要 |
Methods for estimating formation pressure from data taken during the drawdown cycle are presented. In one aspect, a method of determining a formation pressure during drawdown of a formation comprises sampling fluid from a formation using a downhole tool having a sample volume and a fluid sampling device. At least one time dependent parameter of interest related to the fluid is determined during the drawdown. The at least one time dependent parameter is analyzed using a plurality of calculation techniques to determine the formation pressure. The techniques include (i) a first pressure derivative technique; (ii) a second pressure derivative technique; (iii) a formation rate analysis technique; (iv) a dp/dt-ratio technique; and (v) a stepwise drawdown technique.
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申请公布号 |
US6923052(B2) |
申请公布日期 |
2005.08.02 |
申请号 |
US20020242184 |
申请日期 |
2002.09.12 |
申请人 |
BAKER HUGHES INCORPORATED |
发明人 |
KRUEGER SVEN;NIEMEYER EICK;MEISTER MATTHIAS;LEE JAEDONG |
分类号 |
E21B49/00;E21B49/10;(IPC1-7):E21B21/08;E21B47/06;E21B47/10;E21B49/08 |
主分类号 |
E21B49/00 |
代理机构 |
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地址 |
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