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:
Oct. 01, 1991
Filed:
Feb. 09, 1990
Jean-Jacques Fery, Bar-le-Duc, FR;
Jean-Marc Patroni, Les Ulis, FR;
Total Compagnie Francaise des Petroles, Paris, FR;
Abstract
The process for measuring the coefficients of adhesion and friction of a drilling fluid involves, following the standardized filtration of the drilling fluid or mud from which a solid phase 'filtration cake' and a liquid phase or filtrate collected on the downstream side of a filter 15 are obtained, placing a metal piston skirt 29 in contact with a filtration cake in the presence of a contact pressure, and measuring the moments of adhesion and friction when the skirt is driven in axial rotation perpendicular to the contact surface, and the axial extraction or contact adhesion force when the skirt is withdrawn after a determinate period of contact.