E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 33/13 (2006.01) C09K 8/42 (2006.01) C09K 8/60 (2006.01)
Patent
CA 2258321
Spacer fluids comprising a dispersant selected from the group consisting of water soluble polymers comprising allyloxybenzene sulfonate or allyloxybenzene phosphonate polymerized with at least one of acrylic acid, acrylamides, alkyl acrylamides, maleic anhydride, itaconic acid, sulfonated or phosphonaated styrene, sulfonated or phosphonated vinyl toluene, sulfonated or phosphonated isobutylene, acrylamidopropane sulfonate or acrylamidopropanephosphonate, vinyl alcohol, sulfonated or phosphonated propene and alkali metal, alkaline earth metal and ammonium salts thereof and water with optional additional components such as surfactants, viscosifiers and wetting materials to form a rheologically compatible spacer fluid for use between a drilling fluid and a cement slurry and a method for using such spacer fluids to displace drilling fluids from a wellbore space with a cement slurry.
L'invention concerne des fluides d'écartement qui comprennent un agent dispersant consistant en polymères solubles dans l'eau; ces polymères se composent d'oxybenzène allylique sulfonate ou d'oxybenzène allylique phosphonate polymérisés avec au moins un des éléments suivants: acide acrylique, acrylamides, alkylacrylamides, anhydride maleique, acide itaconique, styrolène sulfoné ou phosphoné, toluène vinylique sulfoné ou phosphoné, isobutylène sulfoné ou phosphoné, acrylamidopropane sulfonate ou acrylamidopropane phosphonate, alcool vinylique, propylène et métal alcalin sulfoné ou phosphoné, métal alcalino-terreux et sels d'ammonium et eau; on peut ajouter des composants optionnels tels que des tensioactifs, des améliorants de viscosité, et des matières de mouillage pour former un fluide d'écartement rhéologiquement compatible, destiné à être utilisé entre une boue de forage et un laitier de ciment. L'invention concerne également un procédé d'utilisation de tels fluides d'écartement afin de déplacer des boues de forage d'un forage à l'aide d'un laitier de ciment.
Carpenter Robert
Johnson David
Atlantic Richfield Company
Swabey Ogilvy Renault
LandOfFree
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