Multi-coil electromagnetic focusing methods and apparatus to...

Details Multi-coil electromagnetic focusing methods and apparatus to... Multi-coil electromagnetic focusing methods and apparatus to...

G - Physics

01

V

G01V 3/30 (2006.01) E21B 47/12 (2006.01) G01V 3/28 (2006.01)

Patent

CA 2361315

Methods and apparatus for canceling or eliminating borehole eccentricity effects on a formation resistivity measurement obtained with transmitter and/or receiver antennas which are substantially time varying magnetic dipoles with their dipole moments aligned at an angle to the axis of the borehole. Apparatus are configured with a plurality of antennas having tilted or transverse magnetic dipole moments, at least one current sensor, means for conducting alternating current through one or more of the antennas, and means for calculating a scaling factor from signal measurements and for scaling the alternating current with the factor.

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