Well logging apparatus with pad-mounted array of vertical electr

Details Well logging apparatus with pad-mounted array of vertical electr Well logging apparatus with pad-mounted array of vertical electr

1977-06-10

1978-08-29

Strecker, Gerard R.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

G01V 318, G01V 306

Patent

active

041106822

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 vertical electrodes. The length of these electrodes is greater near the edges of the pad than in the middle thereof. 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: 3798535 (1974-03-01), Schuster

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