Method of using thixotropic cements for combating lost circulation problems
AssigneeHalliburton Company
InventorsJerry Childs, Fred Sabins, Mary J. Taylor
Life of this patent
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Abstract
Thixotropic cement composition comprising water, hydraulic cement, titanium chelates, and crosslinkable agents and methods of using same for sealing or cementing subterranean zones penetrated by a borehole are provided.
Claims14
A method for combating lost circulation in a zone during cementing of oil, gas, and water wells comprising pumping a thixotropic cement slurry into said zone, terminating pumping, and allowing said static slurry to set, wherein said slurry comprises water, hydraulic cement, an effective amount of crosslinking agent selected from the group consisting of titanium chelates and an effective amount of crosslinkable agent selected from the group consisting of water-soluble cellulose ethers;
- polyvinyl alcohol;
- homopolymers, copolymers and terpolymers of AMPS (2-acrylamido - 2-methlypropane sulfonic acid), sodium vinylsulfonate, acrylamide, N,N dimethylacrylamide and acrylic acid;
- and mixtures thereof.
A method of combating lost circulation during cementing of the annular space between the casing and the formation wall of an oil or gas well or the like comprising pumping a thixotropic cement slurry into said space, terminating pumping, and allowing said slurry to set, wherein said slurry comprises water, hydraulic cement and effective amounts of titanium monotriethanolamine and carboxymethylhydroxyethyl cellulose.
Dependencies are inferred from the claim text.