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:
Feb. 24, 1998
Filed:
Apr. 01, 1996
Applicant:
Inventors:
Assignee:
Institut Francais du Petrole, Rueil-Malmaison, FR;
Primary Examiner:
Int. Cl.
CPC ...
E21B / ; E21B / ;
U.S. Cl.
CPC ...
7315247 ; 175 40 ;
Abstract
In a method and to a system suited for monitoring the behaviour of a drill bit (2), the damping associated with a natural mode of the torsional oscillations measured by at least one measuring device (4) placed in the drill string is determined. The appearance of a stick-slip type dysfunctioning is predicted when the damping value decreases significantly as a function of time, and drilling parameters are then varied in order to avoid the appearance of the dysfunctioning.