Electricity: measuring and testing – Magnetic – Magnetic sensor within material
Patent
1978-12-18
1981-09-29
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
Magnetic sensor within material
324225, 324229, 324243, G01N 2772, G01N 2782, G01R 3312
Patent
active
042925886
ABSTRACT:
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.
REFERENCES:
patent: 2992390 (1961-07-01), DeWitte
patent: 3417325 (1968-12-01), McCullough et al.
Wilson et al., "Development of Techniques for Improving Downhole Inspection of Steel Pipe Casing", Nov. 1977, Report to Pipeline Research Committee of the Amer. Gas Assoc.
Schlumberger Technology Corporation
Snow Walter E.
Strecker Gerard R.
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