Halliburton Company

S Prabhakara Rao

Lance Everett Brothers

John F Burkhalter

John K Borchardt

Bobby G Brake

Cementing compositions and methods of using such compositions in oil, gas and water well cementing operations to reduce fluid loss from the composition to the formation are disclosed. Such compositions incorporate certain copolymers and copolymer salts of N,N dimethylacrylamide and 2-acrylamido, 2-methyl propane sulfonic acid having mole ratios of between 1:4 and 4:1 respectively and average molecular weights of between about 75,000 and about 300,000.

Hydrolytically stable polymers for use in oil field cementing methods

High density well drilling, completion and workover brines having low fluid loss to subterranean formations when in contact therewith are provided comprised of water, one or more inorganic salts, and an additive for reducing fluid loss. The additive is comprised of water soluble binary or ternary copolymers formed from vinyl monomers. Methods of use are also provided.

High density well drilling, completion and workover brines, fluid loss

A dispersant for cement slurries is provided comprised of a copolymers of sodium vinylsulfonate and either acrylic acid or acrylamide. Salt cement slurries and method of use in cementing in subterranean wellbores are also provided.

Salt cement dispersant and method of using same in cementing

Cementing compositions and methods of using such compositions in oil, gas and water well cementing operations to reduce fluid loss from the composition to the formation are disclosed. Such compositions incorporate certain copolymers of N, N dimethylacrylamide and 2-acrylamido, 2-methyl propane sulfonic acid having mole ratios of between 1:4 and 4:1 respectively and average molecular weights of between about 75,000 and about 300,000.

Cementing compositions and methods of using same in high temperature oil and gas well cementing operations are disclosed. Such compositions are comprised of fresh or salt water cement slurries, a water-soluble borate and particular terpolymers comprised of a strong acid monomer, a weak acid monomer and a nonionic monomer.

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Duncan, OK, United States of America

S Prabhakara Rao