High temperature wellbore cement slurry
AssigneeShell Oil Company
InventorsJames J. W. Nahm, Harold J. Vinegar, John M. Karanikas, Reece E. Wyant
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Abstract
A cement slurry is provided which is useful to cement wellbores in high temperature service. A high alumina cement is used. The density of the slurry is relatively low as a result of using a low density aggregate. In a preferred embodiment, the low density aggregate is graphite. The graphite additionally imparts a significantly improved thermal and electrical conductivity to the hardened cement.
Claims13
A low density wellbore cement slurry composition suitable cementing wellbores for high temperature service comprising:
- a) a high alumina cement in an amount of about 40 pounds per barrel of slurry or greater;
- b) graphite in an amount greater than about one quarter, by volume, of the solids in the cement slurry;
- and
- c) and a carrier fluid comprising drilling mud.
A low density wellbore cement slurry composition suitable for cementing a wellbore for high temperature service comprising:
- a) a high alumina cement in an amount of about 40 pounds per barrel of slurry or greater;
- b) graphite in an amount greater than about one quarter by volume of the solids of the slurry;
- and
- c) a carrier fluid.
Dependencies are inferred from the claim text.