发明名称 |
Apparatus and method for wellbore resistivity measurements in oil-based muds using capacitive coupling |
摘要 |
A resistivity device for downhole use with a nonconducting mud injects a current at a frequency sufficiently high to pass capacitively through the mud and a mud cake into the formation. The frequency is further selected so that the impedance due to the dielectric constant of the formation is small compared to the formation resistivity. Dual frequency measurements may be used to further minimize the effects of the mud and mud cake resistivity. When multiple frequency measurements are used, frequency focusing may be used to get an estimate of formation resistivity that is independent of near borehole effects.
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申请公布号 |
US6809521(B2) |
申请公布日期 |
2004.10.26 |
申请号 |
US20030347019 |
申请日期 |
2003.01.17 |
申请人 |
BAKER HUGHES INC |
发明人 |
TABAROVSKY LEONTY ABRAHAM;ALEXY ALBERT |
分类号 |
G01V3/24;(IPC1-7):G01V3/20 |
主分类号 |
G01V3/24 |
代理机构 |
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主权项 |
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