Apparatus including a magnetometer having a pair of U-shaped cor

Details Apparatus including a magnetometer having a pair of U-shaped cor Apparatus including a magnetometer having a pair of U-shaped cor

1982-11-22

1985-02-26

Strecker, Gerard R.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

With radiant energy or nonconductive-type transmitter

324247, 324346, G01V 326, G01R 3302

Patent

active

045020108

ABSTRACT:
A method of well logging in petroleum exploration and apparatus for use in the method as described. An improved magnetometer is disposed in a well bore to provide indications of the distribution, filimentation, and distortion of a controlled current flow within adjoining strata of interest. The current flow is excited by a distant alternating source located at the surface or at other boreholes, and perturbations in the current flow and accompanying magnetic field caused by the electrical characteristics of the adjoining strata are registered by the magnetometer.
The magnetometer comprises a pair of elongated U-shaped cores of laminated, high-permeability metal, with portions of each core being surrounded by a sensing coil. The coil output is fed to surface equipment for detection and analysis.

REFERENCES:
patent: 2916696 (1959-12-01), Schonstedt
patent: 3439264 (1969-04-01), Schonstedt
patent: 4323848 (1982-04-01), Kuckes
patent: 4388592 (1983-06-01), Schonstedt

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