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 1203684

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. corrected measurement output is generated in response to these two components. 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. The generation of the corrected measurement output may also comprise the simultaneous solution of two non-linear equations which express the magnitudes of the inphase and quadrature components as functions of a1, the inside radius of the pipe, and?, a factor proportional to the ratio of the permeability to the conductivity of the pipe.

443074

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