Stuck point indicating device with linear sensing means

Details Stuck point indicating device with linear sensing means Stuck point indicating device with linear sensing means

1983-03-25

1985-05-07

Birmiel, Howard A.

Measuring and testing

Borehole or drilling

Downhole test

166 66, 166301, 166255, E21B 3100, E21B 4700

Patent

active

045150109

ABSTRACT:
A device for determining the stuck point of a drill pipe in a borehole consisting of two relatively movable sections, anchoring means for each section, a sensing means for detecting relative movement of the two sections and producing an inductance representative of the movement. The inductance is transformed into a frequency modulated signal which is transmitted to the surface and converted from a non-linear direct current voltage representation of relative movement to a linear direct current voltage.

REFERENCES:
patent: 3004427 (1961-10-01), Berry
patent: 3555896 (1971-01-01), Roberts
patent: 3686943 (1972-08-01), Smith
patent: 3942373 (1976-03-01), Rogers
patent: 4351186 (1982-09-01), Moulin
patent: 4402219 (1983-09-01), Hache

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