Method and apparatus for measuring axially extending defects in ferromagnetic elements
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United States of America Patent
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Dec 20, 1988
Issued Date -
N/A
app pub date -
May 4, 1987
filing date -
Apr 11, 1984
priority date (Note) -
Expired
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Abstract
A method and apparatus for determining the extent of axially extending defects in ferromagnetic elements, such as tubing comprising a continuous string for use in an oil or gas well is disclosed. The tubing trip tool detects axial defects, such as sucker rod wear during removal of the tubing from the well. A saturating magnetic field and a fluctuating magnetic field are applied to the tubing and the magnitude of the induced fields and the changes are measured to quantify defects in the tubing.
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