The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 08, 1978
Filed:
Sep. 19, 1977
Yves Nicolas, Versailles, FR;
Andre Landaud, Maisons Alfort, FR;
Schlumberger Technology Corporation, New York, NY (US);
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.