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US 3,937,282 AGranted
Method for cementing wells in low temperature formations
AssigneeHalliburton Company
InventorsStanley H. Shryock, Charles R. George, Willis C. Cunningham
Life of this patent
Estimating the term…
Abstract
The present invention relates to a composition and method for cementing pipe and casing in wells in low temperature earth formations and relates more particularly to the cementing of casing oil and gas wells drilled through permafrost formations.
Claims14
A process for cementing pipe in a well which penetrates a low temperature formation comprising depositing in the space between said pipe and said formation an aqueous slurry of a hydraulic cement composition and thereafter allowing said slurry to harden, wherein said slurry consists essentially of:
- a hydraulic cement, gypsum, a monovalent chloride salt, a setting time retarding agent and water;
- wherein said hydraulic cement is present in said composition in the range of about 15 to about 35 pounds per 75 pounds of dry solids, the weight ratio of said gypsum to said hydraulic cement in said composition is in the range of about 1:1 to about 3:1, said monovalent chloride salt is present in said composition in the range of about 1 to about 3.5 pounds per 75 pounds of dry solids, said setting time retarding agent is present in said composition in the range of about 0.01 to about 0.525 pounds per 75 pounds of dry solids, and said water is present in said composition in the range of about 3 to about 5 gallons per 75 pounds of dry solids.
Dependencies are inferred from the claim text.