Apparatus and method for estimating eccentricity effects in...

Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Earth science

Reexamination Certificate

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Reexamination Certificate

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08046170

ABSTRACT:
A method of evaluating an earth formation is disclosed which includes conveying a logging tool into a borehole in the earth formation and using the logging tool to obtain a first set of azimuthally-independent resistivity measurements of the earth formation and a second set of azimuthally-sensitive resistivity measurements of the earth formation and estimating a value of a property of the earth formation using the first set of measurements and the second set of measurements, the estimation being substantially unaffected by a displacement of the logging tool from a center of the borehole.

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J. H. Moran et al., “Basic Theory of Induction Logging and Application of Study of Two-Coil Sondes,” Geophysics, vol. XXVII, No. 6, Part 1, Dec. 1962, pp. 829-858.

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