Electricity: measuring and testing – Of geophysical surface or subsurface in situ – With radiant energy or nonconductive-type transmitter
Patent
1983-05-02
1985-11-05
Strecker, Gerard R.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
With radiant energy or nonconductive-type transmitter
324224, 324323, 324346, 336 55, G01V 326, E21B 4706, H01F 2708
Patent
active
045516812
ABSTRACT:
The magnetic susceptibility well-logging unit with single power supply thermoregulation system provides power from a single surface power supply over a well-logging cable to an integrated circuit voltage regulator system downhole. This voltage regulator system supplies regulated voltages to a temperature control system and also to a Maxwell bridge sensing unit which includes the solenoid of a magnetic susceptibility probe. The temperature control system is provided with power from the voltage regulator system and operates to permit one of several predetermined temperatures to be chosen, and then operates to maintain the solenoid of a magnetic susceptibility probe at this chosen temperature. The temperature control system responds to a temperature sensor mounted upon the probe solenoid to cause resistance heaters concentrically spaced from the probe solenoid to maintain the chosen temperature. A second temperature sensor on the probe solenoid provides a temperature signal to a temperature transmitting unit, which initially converts the sensed temperature to a representative voltage. This voltage is then converted to a representative current signal which is transmitted by current telemetry over the well logging cable to a surface electronic unit which then reconverts the current signal to a voltage signal.
REFERENCES:
patent: 2625583 (1953-01-01), Broding
patent: 2640869 (1953-06-01), Zimmerman
patent: 2974303 (1961-03-01), Dixon
patent: 3152303 (1964-10-01), Lary et al.
patent: 3818323 (1974-06-01), Dowling et al.
patent: 3831082 (1974-08-01), Mazzagatti
patent: 4015194 (1977-03-01), Epling
patent: 4427941 (1984-01-01), Riedesel et al.
Strecker Gerard R.
The United States of America as represented by the Secretary of
Zack Thomas
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