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

E - Fixed Constructions

21

B

166/3

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

Patent

CA 1048403

WELL LOGGING PAD DEVICES HAVING DIFFERENTIAL PRESSURE RELIEF Abstract of the Disclosure. 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 bore- hole 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 bore- hole 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 measure- ments then being sent up the logging cable to the surface electronics. -1a-

256568

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