Calcium phosphate cement compositions comprising pumice and/or perlite and associated methods
First Claim
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1. A method of cementing comprising:
- introducing a calcium phosphate cement composition into a subterranean formation, wherein the calcium phosphate cement composition is free of cement kiln dust, wherein the calcium phosphate cement composition is unfoamed, and wherein the calcium phosphate cement composition comprises;
calcium aluminate;
wherein the calcium aluminate is present in an amount of greater than 20% to about 60% by weight of the calcium phosphate cement composition;
sodium polyphosphate;
an additive selected from the group consisting of pumice, perlite, and any combination thereof, wherein the additive has a mean particle size of less than about 20 microns; and
water; and
allowing the calcium phosphate cement composition to set, wherein the calcium phosphate cement composition increases a compressive strength by at least 20% compared to a composition comprising a comparable amount of fly ash instead of pumice.
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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.
36 Citations
18 Claims
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1. A method of cementing comprising:
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introducing a calcium phosphate cement composition into a subterranean formation, wherein the calcium phosphate cement composition is free of cement kiln dust, wherein the calcium phosphate cement composition is unfoamed, and wherein the calcium phosphate cement composition comprises; calcium aluminate;
wherein the calcium aluminate is present in an amount of greater than 20% to about 60% by weight of the calcium phosphate cement composition;sodium polyphosphate; an additive selected from the group consisting of pumice, perlite, and any combination thereof, wherein the additive has a mean particle size of less than about 20 microns; and water; and allowing the calcium phosphate cement composition to set, wherein the calcium phosphate cement composition increases a compressive strength by at least 20% compared to a composition comprising a comparable amount of fly ash instead of pumice. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of cementing comprising:
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introducing an unfoamed calcium phosphate cement composition into a space between a well bore wall and a conduit, wherein the calcium phosphate cement composition comprises; calcium aluminate in an amount of greater than 20% to about 60% by weight of the calcium phosphate cement composition; sodium polyphosphate in an amount of about 5% to about 20% by weight of the calcium phosphate cement composition; pumice in an amount of about 15% to about 60% by weight of the calcium phosphate cement composition, wherein the pumice has a mean particle size equal to or less than about 20 microns, and wherein the calcium phosphate cement composition is free of cement kiln dust; a cement set retarder; and water in an amount sufficient to form a pumpable slurry; and allowing the calcium phosphate cement composition to set, wherein the calcium phosphate cement composition increases a compressive strength by at least 20% compared to a composition comprising a comparable amount of fly ash instead of pumice. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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Specification