Well logging pad devices having differential pressure relief

Details Well logging pad devices having differential pressure relief Well logging pad devices having differential pressure relief

1975-09-26

1977-01-11

Gill, James J.

Measuring and testing

Borehole or drilling

Downhole test

166100, E21B 4900

Patent

active

040020630

ABSTRACT:
A well logging instrument comprises a focus section having a focus upper guard, a center electrode and lower focus guard. The bottom section of the instrument includes a pad device having electrodes on its borehole wall-engaging surface and adapted to be urged against the borehole wall and also having a plurality of pressure relief holes formed therein to reduce differential pressure which might otherwise build up between the surface of the pad and the borehole wall. The remote electrode of the focus portion of the instrument is the armor surrounding the logging cable. The lower focus guard serves a dual function in that it is also the mini-focus remote electrode. Means are provided for measuring the potential between the focus guard and the cable armor and also between the microguard and the lower focus guard, both measurements then being sent up the logging cable to the surface electronics.

REFERENCES:
patent: 2313176 (1943-03-01), Shelby
patent: 2851107 (1958-09-01), Chivens et al.
patent: 3028542 (1962-05-01), Terry
patent: 3566682 (1971-03-01), Winkler
patent: 3577782 (1971-05-01), Aitken

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