Atlantic Richfield Company

Halliburton Company

David L Johnson

Robert B Carpenter

Krishna M Ravi

J Michael Wilson

Richard R Jones

Bill W Loughridge

J Benjamin Bloys

A cement slurry composition suitable for well bore cementation is provided containing as an essential component a synthetic hectorite clay in amount sufficient to reduce free water formation and solids segregation.

Cement composition

A method and a drilling fluid/cement slurry composition for cementing a wellbore. The drilling fluid/cement slurry composition comprises A cement slurry composition comprising:

Method and cement-drilling fluid cement composition for cementing a

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.

Method and spacer fluid composition for displacing drilling fluid from a

A well completion spacer fluid is provided which is particularly suitable for separating a cement slurry from drilling fluid in primary cementing operations. The well completion spacer fluid is also useful for separating other potentially incompatible fluids in the wellbore, such as, separating drilling fluid from a completion brine. The spacer fluid basically comprises water, a hydrous magnesium silicate clay, silica and organic polymer(s).

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Dallas, TX, United States of America

David L Johnson