Use of anionic dispersion polymers as viscosity modifiers in...

C - Chemistry – Metallurgy – 09 – K

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C09K 8/24 (2006.01)

Patent

CA 2486407

An aqueous drilling fluid used in drilling wells through subterranean formations having a pH of between about 7 and about 12 and a viscosity of from about 20 to about 80 sec (Marsch cone) which is prepared by admixing fresh water, brine or seawater with about 0.021b to about 2.5 lb per barrel, based on polymer actives, of one or more anionic dispersion polymers, wherein the anionic dispersion polymers are composed of about 2 to about 98 mole percent of one or more anionic monomers and from about 98 to about 2 mole percent of one or more nonionic monomers and wherein the anionic dispersion polymers have a RSV of from about 10 to about 50 dL/g, a method of drilling a well bore through a subterranean formation and a method of viscosifying an aqueous drilling fluid.

Fluide de forage aqueux utilisé dans des puits de forage à travers des formations souterraines, ayant un pH situé entre environ 7 et environ 12 et une viscosité située entre environ 20 et environ 80 sec (cône de Marsh), qui est préparé par mélange d'eau fraîche, de saumure ou d'eau de mer avec environ 0,02 livre à environ 2,5 livres par baril, sur la base de polymères actifs, d'un ou plusieurs polymères de dispersion anioniques. Les polymères de dispersion anioniques sont composés d'environ 2 à environ 98 moles pour cent d'un ou plusieurs monomères anioniques et d'environ 98 à environ 2 moles pour cent d'un ou plusieurs monomères non ioniques, lesdits polymères de dispersion anioniques ayant une viscosité spécifique réduite (RSV) d'environ 10 à environ 50 dL/g. La présente invention concerne également un procédé de forage de puits à travers des formations souterraines et un procédé d'amélioration de l'indice de viscosité d'un fluide de forage aqueux.

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