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:
Mar. 01, 1988
Filed:
Mar. 10, 1987
Applicant:
Inventors:
Herve Righi, Saint Jean de Moirans, FR;
Georges Obrecht, Seyssins, FR;
Assignee:
Alsthom, Paris, FR;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
285-2 ; 285-3 ; 285922 ; 175320 ;
Abstract
The invention relates to a safety connection for drilling purposes, especially for oil wells. The connection comprises two portions (1,2) which, during normal drilling, transmit the torque and the thrust required for the tool to operate, said torque and thrust being transmitted via a drive cone (11) and fluting (10). In the event of the tool becoming jammed downhole, strong axial traction breaks calibrated traction links (4) at a predetermined force, thereby separating said two portions (1, 2) and making it possible to abandon downhole solely the tool and the connection portion (1) connected thereto.