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Patent
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G01V 3/36 (2006.01) E21B 47/00 (2006.01) G01V 3/18 (2006.01) G01V 3/28 (2006.01)
Patent
CA 1231376
ABSTRACT OF THE DISCLOSURE The present invention is a well logging receiver coil system which includes a coil. The system also includes a variable capacitor connected across the coil to form a resonant circuit tuned to a predetermined frequency. The coil in the presence of an electromagnetic field has a current induced therein representative of the strength of the electromagnetic field. A pick-off circuit is connected to the coil in a predetermined manner and provides a signal representative of the strength of the magnetic component of the electromagnetic field substantially unaffected by the electrical field component of the electromagnetic field.
484961
Cox Percy T.
Nussbaum Theodore W.
Tooker Keith R.
Smart & Biggar
Texaco Development Corporation
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