Calcium phosphate cement compositions comprising pumice and/or perlite and associated methods
First Claim
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1. A well cement composition comprising:
- calcium aluminate;
sodium polyphosphate in an amount of about 2% to about 20% by weight of the cement composition;
an additive comprising pumice, wherein the additive has a mean particle size of less than about 15 microns; and
water in an amount sufficient to form a pumpable slurry;
wherein the additive is present in an amount that will increase a compressive strength of the well cement composition by at least 20% compared to the well cement composition comprising a comparable amount of fly ash instead of the additive.
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Abstract
Methods and compositions are provided that related to cementing operations. Methods and compositions that include pumice and/or perlite as a replacement for fly ash.
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Citations
16 Claims
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1. A well cement composition comprising:
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calcium aluminate; sodium polyphosphate in an amount of about 2% to about 20% by weight of the cement composition; an additive comprising pumice, wherein the additive has a mean particle size of less than about 15 microns; and water in an amount sufficient to form a pumpable slurry; wherein the additive is present in an amount that will increase a compressive strength of the well cement composition by at least 20% compared to the well cement composition comprising a comparable amount of fly ash instead of the additive. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A well cement composition comprising:
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calcium aluminate in an amount of about 15% to about 60% by weight of the cement composition; sodium polyphosphate in an amount of about 2% to about 20% by weight of the cement composition; pumice in an amount of about 15% to about 60% by weight of the cement composition, wherein the pumice has a mean particle size of less than about 15 microns; a cement set retarder; and water in an amount sufficient to form a pumpable slurry; wherein the pumice is present in an amount that will increase a compressive strength of the well cement composition by at least 20% compared to the well cement composition comprising a comparable amount of fly ash instead of the pumice. - View Dependent Claims (12, 13, 14, 15, 16)
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Specification