Electricity: measuring and testing – Of geophysical surface or subsurface in situ – With radiant energy or nonconductive-type transmitter
Patent
1981-06-08
1984-06-19
Strecker, Gerard R.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
With radiant energy or nonconductive-type transmitter
324 83D, 340861, G01V 328, G01V 334, G01R 2500, E21B 4712
Patent
active
044555296
ABSTRACT:
A digital induction resistivity logging system is disclosed for digitally measuring in one phase sensitive detector both the in-phase (R) and quadrature (X) phase components in a receiver signal generated in response to eddy currents flowing in the earth's sub-surface formations. The induction logging system includes a central processing unit (CPU) located at the surface for receiving digital signals from a digital induction logging tool located downhole, and for processing the received data. The digital induction tool includes a digital sinewave generator for generating a highly phase stable, low distortion transmitter signal the frequency of which is selectable from among at least two transmitter frequencies. Automatic phase compensation is included to dynamically compensate for both static and temperature dependent phase shift errors introduced by circuits of the tool involved in the component measurements. A floating point analog-to-digital convertor capable of handling the wide dynamic range in the detected phase component signals is provided to convert the phase detector output into digital samples for use by the CPU.
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Schlumberger Technology Corporation
Strecker Gerard R.
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