Apparatus and method for wellbore resistivity measurements...

Details Apparatus and method for wellbore resistivity measurements... Apparatus and method for wellbore resistivity measurements...

2011-06-28

2011-06-28

LeDynh, Bot L (Department: 2858)

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

Using electrode arrays, circuits, structure, or supports

C324S375000

Reissue Patent

active

RE042493

ABSTRACT:
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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