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Apparatus and method for wellbore resistivity measurements in oil-based muds using capacitive coupling
Apparatus and method for wellbore resistivity measurements in oil-based muds using capacitive coupling
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机译:使用电容耦合在油基泥浆中测量井眼电阻率的装置和方法
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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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