E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/2
E21B 47/00 (2006.01) E21B 23/01 (2006.01) E21B 47/09 (2006.01)
Patent
CA 1071093
ABSTRACT OF THE DISCLOSURE 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 ant improved sensor is arranged as an elongated body tandemly interconnecting the tool anchors and having upper and lower portions thereof co- operatively 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.
287095
Landaud Andre
Nicolas Yves
LandOfFree
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