Total Compagnie Francaise Des Petroles

Etablissements Vasset

Jean-Jacques Fery

Jean-Pierre P Binon

Marie-Christine P Leblanc

Jean-Marc Patroni

Josiane A Durrieu

Gerard G Provin

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rotation perpendicular to the contact surface, and the axial extraction or contact adhesion force when the skirt is withdrawn after a determinate period of contact.

Procedure and cell for measuring coefficients of adhesion and friction

Process for treating an aqueous solution of acrylamide resin, characterized in that an emulsifier which is preferably nonionic or anionic, a solution of initiator comprising an organic peroxide, preferably a diperoxide, and optionally a solution of a retarder preferably consisting of a phenol derivative or an alkali metal inorganic derivative are added slowly and with stirring, preferably in the form of a pre-emulsion, to an aqueous solution of acrylamide resin monomer.

Process for treating an aqueous solution of acrylamide resin in order to

Growing community of inventors

Bar le Duc, France

Jean-Jacques Fery