Methods and apparatus for determining the stuck point of a condu

Details Methods and apparatus for determining the stuck point of a condu Methods and apparatus for determining the stuck point of a condu

1977-09-19

1978-08-08

Novosad, Stephen J.

Wells

Processes

With indicating, testing, measuring or locating

166 65R, 73151, E21B 4700

Patent

active

041050711

ABSTRACT:
In the representative embodiment of the new and improved apparatus disclosed herein, a so-called "stuck-point indicator" or "freepoint-indicator" tool includes a unique deformation-responsive sensor tandemly arranged between upper and lower hydraulically-operated tool anchors which, in the preferred embodiment of the tool, are cooperatively arranged to be sequentially engaged with longitudinally-spaced wall portions of a string of well pipe believed to be stuck in a well bore. In the disclosed embodiment of the tool, the new and improved sensor is arranged as an elongated body tandemly interconnecting the tool anchors and having upper and lower portions thereof cooperatively arranged for being preferentially deformed in response to tensional forces and torsional forces acting on the body. Separate strain gages are arranged on the upper and lower portions of the sensor body as required for producing distinctive electrical signals respectively representative of tensional forces and torsional forces acting on the body.

REFERENCES:
patent: RE26458 (1968-09-01), Moore
patent: 2629445 (1953-02-01), Dill
patent: 3006186 (1961-10-01), Berry
patent: 3227214 (1966-01-01), Whann
patent: 3367179 (1968-02-01), Moore
patent: 3491830 (1970-01-01), Sweetman
patent: 3555896 (1971-01-01), Roberts
patent: 3670566 (1972-06-01), Basham et al.
patent: 3686943 (1972-08-01), Smith

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