Apparatus and method for wellbore resistivity determination and imaging using capacitive coupling
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United States of America Patent
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Jul 29, 2003
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app pub date -
Mar 4, 2002
filing date -
Apr 18, 2001
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Abstract
An apparatus for obtaining resistivity images of a borehole having an oil-based mud includes a rotating measure electrode on a measurement-while-drilling apparatus. A modulated measure current is capacitively coupled to the formation through the nonconducting mud. The electrode may be carried on a stabilizer of the drilling assembly. An extendable arm may be used to maintain a desired distance between the electrode and the formation.
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