Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1975-10-17
1977-04-19
Strecker, Gerard R.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
73152, 324 10, G01V 318, E21B 4900
Patent
active
040191257
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 one or more pressure relief devices, for example, spring-loaded check valves, located 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: 2747402 (1956-05-01), Doll
patent: 2983586 (1961-05-01), Blanchard
patent: 3116449 (1963-12-01), Vogel
patent: 3177938 (1965-04-01), Roussin
patent: 3209588 (1965-10-01), Terry
patent: 3377550 (1968-04-01), Osoba et al.
patent: 3579098 (1971-05-01), Mougne
Dresser Industries Inc.
Johnson, Jr. William E.
Strecker Gerard R.
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