Coatex S.a.

Total Compagnie Francaise Des Petroles S.a.

Pierre Bouchut

Jacky Rousset

Yves Kensicher

Daniel Baffreau

Marie-Christine P Leblanc

Yves Roca

A non-polluting dispersing agent for drilling fluids based on soft water or salt water. A dispersing agent for aqueous drilling fluids, optionally saline, belonging to the group of polymers and/or copolymers containing acid functions which is characterized in that, to ensure that these fluids retain their rheological characteristics, even under the extreme temperature and pressure conditions prevailing in deep bore holes, said dispersing agent is a salt of said polymers and/or copolymers of which the salifying cation corresponds to a metal having a Pauling electronegativity at least equal to 0.95 and preferably greater than 1.

Non-polluting dispersing agent for drilling fluids based on freshwater

Hydraulic cement composition with delayed setting, intended to be employed in an environment which may be under extreme temperature, pressure and salinity conditions, the composition being characterized in that it incorporates

Composition cimentaire hydraulique a prise retardee pour cimentation a

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Decines, France

Pierre Bouchut