Apparatus for servicing tubular strings in subterranean wells
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United States of America Patent
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-
Dec 29, 1987
Issued Date -
N/A
app pub date -
Feb 10, 1986
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 sections of a continuous tubing string used in subterranean oil and gas wells is disclosed. The tubing trip tool is mounted on a surface rig surrounding the tubing string and defects are magnetically detected during tubing removal from the well bore. The tool comprises a segmented expandable detector head containing elements for measuring average wall thickness and local and axially extending defects. The expandable head is spring loaded and pneumatically actuated. Coupling detectors are located on the ends of the head to count tubing sections and to detect the presence of obstructions on the tubing to prevent damage to the detector head.
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