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AssigneeAtlantic Richfield Company
InventorsRobert B. Carpenter, David L. Johnson
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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 phosphonated 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.
A rheologically compatible spacer fluid for use between a drilling fluid and a cement slurry consisting essentially of:
A rheologically compatible spacer fluid consisting essentially of:
A rheologically compatible spacer fluid consisting essentially of:
A method for displacing a drilling fluid from a wellbore space occupied by the drilling fluid with a settable cement composition, the method consisting essentially of:
Dependencies are inferred from the claim text.