Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1984-04-11
1987-11-03
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
324227, 324232, G01N 2782, G01N 2772, G01R 3312
Patent
active
047045809
ABSTRACT:
A method and apparatus for determining the extent of defects in ferrogmagnetic elements, such as tubing comprising a continuous string for use in an oil or gas well is disclosed. The tubing trip tool measures the depth of local defects, such as corrosion pitting, during removal of the tubing from the well. Tubing velocity is also measured, and couplings between tubing sections are detected and counted, in order to specify the axial location of defects on each tube, and also provide a profile of the condition of the overall string. A saturating magnetic field is applied to the tubing and a comparison of two derivatives of flux leakage is made to quantify defects in the tubing.
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Bradfield James E.
Moake Gordon L.
Eisenzopf Reinhard J.
PA Incorporated
Snow Walter E.
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