Expansive cement
First Claim
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1. An expansive cement composition comprising:
- a Portland cement,a calcium aluminate cement in an amount from about 0.5% to about 8.0% by weight of said Portland cement;
a lithium compound in an amount from about 0.001% to about 0.50% by weight of said Portland cement;
calcium sulfate present in an amount from about 1% to about 15% by weight of said Portland cement;
calcium hydroxide present in an amount from about 0.1% to about 3.0% by weight of said Portland cement; and
sodium bicarbonate present in an amount from about 0.01% to about 1.00% by weight of said Portland cement.
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Abstract
An expansive cement composition including a Portland cement having a calcium aluminate cement additive and a lithium compound additive is provided. The lithium compound additive is capable of producing expansion in set cements when the temperature is at or below room temperature and minimizes the amount of calcium aluminate cement additive needed.
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Citations
11 Claims
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1. An expansive cement composition comprising:
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a Portland cement, a calcium aluminate cement in an amount from about 0.5% to about 8.0% by weight of said Portland cement; a lithium compound in an amount from about 0.001% to about 0.50% by weight of said Portland cement; calcium sulfate present in an amount from about 1% to about 15% by weight of said Portland cement; calcium hydroxide present in an amount from about 0.1% to about 3.0% by weight of said Portland cement; and sodium bicarbonate present in an amount from about 0.01% to about 1.00% by weight of said Portland cement. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for cementing a casing in a bore of a well having a borehole wall, comprising:
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placing a cement slurry composition between the casing and the borehole wall, which composition comprises a Portland cement; a calcium aluminate cement in an amount from about 0.5% to about 8.0% by weight of said Portland cement; and a lithium compound in an amount from about 0.001% to about 0.500% by weight of said Portland cement, calcium sulfate present in an amount from about 1% to about 15% by weight of said Portland cement, calcium hydroxide present in an amount from about 0.1% to about 3.0% by weight of said Portland cement, and sodium bicarbonate present in an amount from about 0.01% to about 1.00% by weight of said Portland cement; wherein said borehole wall and said casing are at a temperature below about 100°
F. - View Dependent Claims (8, 9, 10, 11)
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Specification