Virtual steering of induction tool attenuation and phase...

Details Virtual steering of induction tool attenuation and phase... Virtual steering of induction tool attenuation and phase...

G - Physics

01

V

G01V 3/30 (2006.01) E21B 47/022 (2006.01) E21B 47/12 (2006.01) E21B 49/00 (2006.01)

Patent

CA 2386988

An apparatus and method that provide steerable measurements of attenuation and phase difference are disclosed. In a preferred embodiment, a logging tool is provided with two triads of orthogonal receivers and a triad of orthogonal transmitters. A controller in the logging tool fires selected transmitters singly and in pairs, and determines measurements of ratios between signals received by the receiver triads. The measurement of sixteen ratios is sufficient to allow determination of attenuation and phase difference that would be measured by virtually steered receivers according to equations provided herein.

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