Well cement compositions having improved properties and methods
AssigneeHalliburton Company
InventorsStein Olaussen, Audun Bjordal, Geir Solland
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Abstract
Cement compositions which have improved properties such as increased stability, reduced settling tendencies, enhanced fluid loss properties and the like and methods of using such cement compositions are provided. The cement compositions are comprised of water, hydraulic cement and an aqueous colloidal silicic acid suspension wherein the colloidal silicic acid particles have a specific surface area in the range of from about 50 m.sup.2 /g to about 1000 m.sup.2 /g.
Claims19
An improved well cement composition comprising water in an amount sufficient to form a pumpable slurry, hydraulic cement and an aqueous colloidal silicic acid suspension wherein the colloidal silicic acid particles in the suspension have a specific surface area in the range of from about 50 m.sup.2 /g to about 1000 m.sup.2 /g, said colloidal silicic acid suspension being present in said composition in an amount in the range of from about 1% to about 30% by weight of dry cement therein.
An improved well cement composition comprising:
- (a) Portland hydraulic cement;
- (b) water present in an amount in the range of from about 30% to about 60% by weight of dry cement in said composition;
- (c) an aqueous colloidal silicic acid suspension wherein the colloidal silicic acid particles in the suspension have a specific surface area in the range of from about 300 m.sup.2 /g to about 700 m.sup.2 /g, said colloidal silicic acid suspension being present in said composition in an amount in the range of from about 1% to about 30% by weight of dry cement therein;
- and
- (d) a fluid loss control additive selected from the group consisting of a graft lignin or lignite polymer, an aqueous solution of the reaction product of polyethyleneimine and one or more sulfonated organic compounds and a copolymer of AMPS.RTM. and N,N-dimethylacrylamide present in said composition in an amount in the range of from about 0.1% to about 10% by weight of dry cement in said composition.
An improved method of cementing in a subterranean zone penetrated by a well bore comprising the steps of:
- forming a pumpable cement composition comprising water, Portland hydraulic cement and an aqueous colloidal silicic acid suspension wherein the colloidal silicic acid particles in the suspension have a specific surface area in the range of from about 50 m.sup.2 /g to about 1000 m.sup.2 /g, said colloidal silicic acid suspension being present in said composition in an amount in the range of from about 1% to about 30% by weight of dry cement therein;
- and
- pumping said cement composition into said zone by way of said well bore.
Dependencies are inferred from the claim text.