Apparatus for focusing electrode induced polarization logging

Details Apparatus for focusing electrode induced polarization logging Apparatus for focusing electrode induced polarization logging

G - Physics

01

V

324/10

G01V 3/24 (2006.01) G01V 3/38 (2006.01)

Patent

CA 1231377

A B S T R A C T APPARATUS FOR FOCUSED ELECTRODE INDUCED POLARIZATION LOGGING An induced polarization logging tool for measuring para- meters of a formation surrounding a borehole comprises a survey current electrode and two focusing electrodes disposed on opposite sides of the survey current electrode. The tool further comprises monitoring electrodes for monitoring the current flow in the formation between the survey current and focusing electrodes. The monitoring electrodes are coupled to circuit means, wherein a first current control means is directly coupled to said survey current electrode and said circuit means for control of the current flow to said survey current electrode in response to and in phase with the monitored current flow, and a second current control means is directly coupled to said focusing electrodes to control the current flow to said focusing electrodes in response to and in phase with the monitored current flow.

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