Well logging apparatus with pad-mounted vertical electrode array

Details Well logging apparatus with pad-mounted vertical electrode array Well logging apparatus with pad-mounted vertical electrode array

1977-06-10

1978-09-26

Strecker, Gerard R.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

G01V 318

Patent

active

041173945

ABSTRACT:
In accordance with an illustrative embodiment of the present invention, a well logging apparatus uses a narrow wall-engaging pad equipped with an array of long vertical electrodes. The width of the pad is between 2 and 4 inches, and the length-to-width ratio of the array is between 3 and 5. Circuits are connected to the electrodes for propagating a focused current primarily through the zone of the adjacent formation likely to be flushed by the borehole fluid. This current and the associated potential difference are measured to produce a signal representative of the resistivity of the flushed zone.

REFERENCES:
patent: 2669690 (1954-02-01), Doll
patent: 2712630 (1955-07-01), Doll
patent: 2712631 (1955-07-01), Ferre
patent: 2750557 (1956-06-01), Bricaud
patent: 2876413 (1959-03-01), Saurenman et al.
patent: 3060373 (1962-10-01), Doll
patent: 3798535 (1974-03-01), Schuster

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