Casing inspection with magnetic permiability correction

Details Casing inspection with magnetic permiability correction Casing inspection with magnetic permiability correction

E - Fixed Constructions

21

B

324/53

E21B 47/08 (2006.01)

Patent

CA 1157912

ABSTRACT OF THE INVENTION An electromagnetic thickness tool is disclosed to produce a measurement of the wall-thickness of a ferromagnetic casing corrected for the effects of casing permeability. First apparatus provides an uncorrected thickness signal proportional to the thickness of the casing uncorrected for the effects of casing permeability. A second apparatus provides a permeability signal representative of the permeability of the casing. A signal processor uses the mathematical square root of the permeability signal as a correction factor for the uncorrected thickness signal for generating the corrected value. The second apparatus, responsive to a signal proportional to the magnitude of the inside diameter of the casing, corrects the permeability signal for the effects of casing inside diameter.

341257

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