Electrode structure to measure borehole resistivity

Details Electrode structure to measure borehole resistivity Electrode structure to measure borehole resistivity

G - Physics

01

V

324/10

G01V 3/20 (2006.01) E21B 49/00 (2006.01)

Patent

CA 1227538

Abstract of the Disclosure An array of electrodes is presented for accurate and improved measurement of borehole resist- ivity. The electrode array comprises five electrodes mounted on a relatively short insulated segment of a drill string. Current flows from the first elect- rode to the second electrode and is sensed by third and fourth electrodes. Any leakage current from the first electrode is collected by a fifth electrode and is kept isolated from the current flowing between the first and second electrodes thus insuring accur- ate determination of apparent formation resistivity. A current source, preferably a constant current source is used to determine the current in the circuit of the first and fifth electrodes.

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