Method and apparatus for detecting the location of defects in tubular sections moving past a well head
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United States of America Patent
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Jan 13, 1987
Grant Date -
N/A
app pub date -
Apr 11, 1984
filing date -
Apr 11, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A tubing trip tool for use in determining the extent of defects in tubular elements comprising a continuous string used in a subterranean oil or gas well during removal of the string from the well is disclosed. Local defects and axially extending defects, as well as the average wall thickness of the tubular elements, are measured. The position of the defects is determined by measuring the variable velocity of the tubular elements as they are removed from the well and by detecting end couplings having a larger cross-sectional area and the direction in which the end couplings are moving. A string profile of the position of the defects in the continuous string can also be established.
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