Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1984-04-11
1986-12-16
Karlsen, Ernest F.
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
324242, 324262, G01N 2772, G01R 3312
Patent
active
046299912
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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Karlsen Ernest F.
PA Incorporated
Snow Walter E.
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