Expansive cement
First Claim
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1. A method of using an expansion additive composition, the method comprising:
- mixing the expansion additive composition, a Portland cement and water so as to form a slurry, wherein the expansion additive composition comprises;
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; and
introducing the slurry into a subterranean formation.
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Abstract
An expansive additive composition for use in Portland cements and a method of using such an additive composition is provided. The additive composition can include a calcium aluminate cement additive and a lithium compound. The additive composition 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
14 Claims
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1. A method of using an expansion additive composition, the method comprising:
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mixing the expansion additive composition, a Portland cement and water so as to form a slurry, wherein the expansion additive composition comprises; 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; and introducing the slurry into a subterranean formation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of using an expansion additive composition, the method comprising:
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mixing the expansion additive composition, a Portland cement and water so as to form a slurry, wherein the expansion additive composition comprises; a calcium aluminate cement in an amount from about 1.0% to about 5.0% by weight of said Portland cement; a lithium salt in an amount from about 0.005% to about 0.150% by weight of said Portland cement, wherein the lithium salt is selected from the group consisting of lithium carbonate, lithium halides, lithium sulfate, hydrates of lithium sulfate, lithium nitrate, lithium hydroxide, and mixtures thereof; 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; and introducing the slurry into an annulus between a casing and a borehole wall, wherein said borehole wall and said casing are at a temperature below about 100°
F., and wherein said expansion additive composition results in a 10% increase in volume of the slurry when setting occurs at a temperature of below 100°
F.
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Specification