Apparatus for conduit free-point detection in boreholes

Measuring and testing – Borehole or drilling – Downhole test

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Details

E21B 4700

Patent

active

043511864

ABSTRACT:
The apparatus includes a body member lowered within drill pipes and having an upper part (26) and a lower part (27) arranged for limited movements with respect to each other. Each part of the body member is anchored inside the drill pipes and the movements between said parts are detected when stresses are applied to the drill pipes from the surface.
A first radial-coil transformer has a primary winding (35) integral with a part of the body member and a secondary winding (36,37) integral with the other part to detect the angular movements. A second axial-coil transformer has a primary winding (40) integral with a part of the body member and a secondary winding (41,42) integral with the other part to detect the longitudinal movements. The signals delivered by the transformers are linear functions of the respective movements.

REFERENCES:
patent: 2530309 (1950-11-01), Martin
patent: 2550964 (1951-05-01), Brookes
patent: 3153339 (1964-10-01), Alexander et al.
patent: 3233170 (1966-02-01), Rogers
patent: 3686943 (1972-08-01), Smith
patent: 3942373 (1976-03-01), Rogers
patent: 4105071 (1978-08-01), Nicolas et al.
patent: 4207765 (1980-06-01), Kiff
patent: 4265110 (1981-05-01), Moulin
patent: 4289024 (1981-09-01), Basham et al.

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