Electrode array for measurement of borehole resistivity

Details Electrode array for measurement of borehole resistivity Electrode array for measurement of borehole resistivity

1982-11-12

1986-02-11

Strecker, Gerard R.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

Using electrode arrays, circuits, structure, or supports

324347, G01V 320, E21B 4900

Patent

active

045701237

ABSTRACT:
An array of electrodes is presented for accurate and improved measurement of borehole resistivity. The electrode array comprises five electrodes mounted on a relatively short insulated segment of a drill string. Current flows from the first electrode 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 accurate 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.

REFERENCES:
patent: 2206891 (1940-07-01), Hawley
patent: 2211124 (1940-08-01), Jakosky
patent: 2404622 (1946-07-01), Doan
patent: 2922103 (1960-01-01), Smith
patent: 2941784 (1960-06-01), Martin
patent: 3293542 (1966-12-01), Piety
patent: 4286217 (1981-08-01), Planche et al.
patent: 4356629 (1982-11-01), Jeter et al.

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