Method and apparatus for measuring defects in ferromagnetic tubi

Details Method and apparatus for measuring defects in ferromagnetic tubi Method and apparatus for measuring defects in ferromagnetic tubi

1984-04-11

1985-01-08

Birmiel, Howard A.

Measuring and testing

Borehole or drilling

Downhole test

324226, 324229, 324232, G01N 2782, G01N 2772

Patent

active

044921152

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, such as corrosion pitting, and axial defects, such as sucker rod wear during removal of the tubing from the well. Tubing velocity is also measured, and couplings between tubing sections are detected and counted, in order to specify the axial location of defects on each tube, and also provide a profile of the condition of the overall string. 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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