Method and apparatus for extending lateral range electrical...

Details Method and apparatus for extending lateral range electrical... Method and apparatus for extending lateral range electrical...

G - Physics

01

V

324/57, 324/9

G01V 3/26 (2006.01)

Patent

CA 1175106

METHOD AND APPARATUS FOR EXTENDED LATERAL RANGE ELECTRICAL CONDUCTIVITY LOGGING Abstract of the Disclosure A method of well logging in petroleum exploration and apparatus for use in the method is described. An improved magnetometer is disposed in a well bore to provide indications of the distribution, filimentation, and distortion of a con- trolled 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 regis- tered by the magnetometer. The magnetometer comprises two pairs of elongated U-shaped cores of laminated, high-permeability metal, adjacent portions of each pair being surrounded by a sensing coil. The coil outputs are fed to surface equipment for detection and analysis.

394520

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