Well logging system for measuring remanent magnetic fields in th

Details Well logging system for measuring remanent magnetic fields in th Well logging system for measuring remanent magnetic fields in th

1976-09-20

1978-01-31

Strecker, Gerard R.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 6, G01V 318, G01V 310, G01V 300

Patent

active

040718158

ABSTRACT:
A borehole tool for logging the remanent magnetic field of the earth formations surrounding a borehole includes a coil system having transmitter, receiver, and nulling coils; a phase-sensitive detector connected across the receiver and nulling coils to provide signals representative of magnetic susceptibility; and a detector system having a pair of axially spaced magnetometers, a pair of counters, an oscillator, a comparator, and a transmitter to provide signals representative of the total magnetic field differential between the two magnetometers. An uphole receiver compares differentials in the magnetic susceptibility measurements between two positions in the borehole with the total magnetic field differential between the same two positions as an indication of the earth's remanent magnetic field.

REFERENCES:
patent: 2664542 (1953-12-01), Lynn
patent: 2716730 (1955-08-01), Williams
patent: 3263161 (1966-07-01), Ruddock et al.
patent: 3274488 (1966-09-01), Washkurak et al.
patent: 3317821 (1967-05-01), Patton et al.
patent: 3321700 (1967-05-01), Zimmerman
patent: 3657636 (1972-04-01), Dowling et al.
patent: 3882375 (1975-05-01), Zemanek
patent: 3965413 (1976-06-01), Yungul

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