Apparatus including a magnetometer having a pair of U-shaped cores for extended lateral range electrical conductivity logging
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United States of America Patent
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Feb 26, 1985
Issued Date -
N/A
app pub date -
Nov 22, 1982
filing date -
Mar 17, 1980
priority date (Note) -
Expired
status (Latency Note)
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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.
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