Method and apparatus for measuring the depth of local defects in ferromagnetic elements
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United States of America Patent
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Nov 3, 1987
Grant Date -
N/A
app pub date -
Apr 11, 1984
filing date -
Apr 11, 1984
priority date (Note) -
Expired
status (Latency Note)
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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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