Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1984-04-11
1986-12-16
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
324227, 324233, 324242, G01N 2782, G01R 3312
Patent
active
046299858
ABSTRACT:
A method and apparatus for determining the extent of defects in ferromagnetic tubular elements comprising a continuous string for use in an oil or gas well is disclosed. The tubing trip tool measures tubing average wall thickness, local defects, and axial defects, such as sucker rod wear during removal of the tubing from the well. Tubing velocity is also measured. A saturating magnetic field and a fluctuating magnetic field are applied to the tubing. Signals corresponding to changes in the induced fields are divided into channels for complete circumferential coverage. Phase shift is then determined by a zero crossing technique to quantify axial defects, such as sucker rod wear.
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Lam Clive C.
Papadimitriou Stylianos
PA Incorporated
Strecker Gerard R.
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