System for determining the free point of pipe stuck in a borehol

Wells – Processes – With indicating – testing – measuring or locating

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Details

166 651, 73151, E21B 4700

Patent

active

047082046

ABSTRACT:
A system for determining the stuck point of pipe in a borehole including a wireline tool having an exciter coil and a receiver coil axially spaced from one another. The exciter coil is driven at a preselected low frequency and the voltage induced into the receiver coil is related to the magnetic permeability of a pipe through which the tool is run. A receiver coil voltage log is run of the section of pipe in the region of the stuck point first while that region is substantially free of mechanical stress. A second log of the same region is run with the pipe under mechanical stress. Comparison of the two logs determines the stuck point from the difference in magnetic permeability of the stressed pipe above the stuck point and the unstressed pipe below the stuck point.

REFERENCES:
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patent: 3095736 (1963-07-01), Rogers
patent: 3690163 (1972-09-01), Shannon et al.
patent: 3942373 (1976-03-01), Rogers
patent: 4289024 (1981-09-01), Basham et al.
patent: 4351186 (1982-09-01), Moulin
patent: 4402219 (1983-09-01), Hache
patent: 4444050 (1984-04-01), Revetz
patent: 4515010 (1985-05-01), Weido et al.

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