Method and apparatus for electrically determining pipe...

Details Method and apparatus for electrically determining pipe... Method and apparatus for electrically determining pipe...

G - Physics

01

B

33/164

G01B 3/26 (2006.01) E21B 47/08 (2006.01)

Patent

CA 1205995

METHOD AND APPARATUS FOR ELECTRICALLY DETERMINING PIPE INSIDE DIAMETER ABSTRACT A method and apparatus is disclosed for electrically measuring the inside diameter of a metallic pipe such as oil or gas well casing. The transimpedance of two coaxial coils within the pipe is determined and then resolved into its inphase and quadrature components. The magnitudes of these two components are linearly combined to generate a corrected measurement output having a lessened sensitivity to the permeability and conductivity of metallic objects. A signal representative of the inside diameter of the pipe is generated in response to the corrected measurement output and may be recorded as a function of travel distance in the pipe.

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