Cement composition containing an additive of a pozzolan and a strength retrogression inhibitor
First Claim
1. A method of cementing in a subterranean formation comprising:
- introducing a cement composition into the subterranean formation, wherein the cement composition comprises;
cement;
water; and
an additive, wherein the additive;
is a pozzolan and a strength-retrogression inhibitor;
is a red brick powder; and
comprises at least the compounds silicon dioxide (SiO2), iron III oxide (Fe2O3), and aluminum oxide (Al2O3), wherein the SiO2 is in a concentration in the range of about 40% to about 60% of the total chemical composition of the additive;
the Fe2O3 is in a concentration in the range of about 15% to about 25% of the total chemical composition of the additive; and
the Al2O3 is in a concentration in the range of about 5% to about 15% of the total chemical composition of the additive,wherein a mixture consisting essentially of;
the additive;
water; and
a source of calcium develops a compressive strength of at least 500 psi (3.4 MPa) at a time of 24 hours, a temperature of 190°
F. (88°
C.), and a pressure of 3,000 psi (20.7 MPa); and
allowing the cement composition to set, wherein the step of allowing is performed after the step of introducing.
1 Assignment
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Accused Products
Abstract
A cement composition comprises: cement; water; and an additive, wherein the additive is a pozzolan and a strength-retrogression inhibitor, and wherein a mixture consisting essentially of: the additive; water; and a source of calcium develops a compressive strength of at least 500 psi at a time of 24 hours, a temperature of 190° F., and a pressure of 3,000 psi. A method of cementing in a subterranean formation comprises: introducing the cement composition into the subterranean formation and allowing the cement composition to set. The compressive strength of the test cement composition consisting essentially of: the cement; the water; and the additive at a final time of 72 hours has a percent change greater than −5% from the compressive strength of the test cement composition at an initial time of 24 hours when tested at a temperature of 300° F. and a pressure of 3,000 psi.
26 Citations
18 Claims
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1. A method of cementing in a subterranean formation comprising:
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introducing a cement composition into the subterranean formation, wherein the cement composition comprises; cement; water; and an additive, wherein the additive; is a pozzolan and a strength-retrogression inhibitor; is a red brick powder; and comprises at least the compounds silicon dioxide (SiO2), iron III oxide (Fe2O3), and aluminum oxide (Al2O3), wherein the SiO2 is in a concentration in the range of about 40% to about 60% of the total chemical composition of the additive;
the Fe2O3 is in a concentration in the range of about 15% to about 25% of the total chemical composition of the additive; and
the Al2O3 is in a concentration in the range of about 5% to about 15% of the total chemical composition of the additive,wherein a mixture consisting essentially of;
the additive;
water; and
a source of calcium develops a compressive strength of at least 500 psi (3.4 MPa) at a time of 24 hours, a temperature of 190°
F. (88°
C.), and a pressure of 3,000 psi (20.7 MPa); andallowing the cement composition to set, wherein the step of allowing is performed after the step of introducing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of cementing in a subterranean formation comprising:
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introducing a cement composition into the subterranean formation, wherein the cement composition comprises; cement; water; and an additive, wherein the additive; is a pozzolan and a strength-retrogression inhibitor; is a red brick powder; and comprises at least the compounds silicon dioxide (SiO2), iron III oxide (Fe2O3) and aluminum oxide (Al2O3), wherein the SiO2 is in a concentration in the range of about 40% to about 60% of the total chemical composition of the additive;
the Fe2O3 is in a concentration in the range of about 15% to about 25% of the total chemical composition of the additive; and
the Al2O3 is in a concentration in the range of about 5% to about 15% of the total chemical composition of the additive, wherein a mixture consisting essentially of;
the additive;
water; and
a source of calcium develops a compressive strength of at least 500 psi (3.4 MPa) at a time of 24 hours, a temperature of 190°
F. (88°
C.), and a pressure of 3,000 psi (20.7 MPa),wherein a test cement composition consisting essentially of;
the cement;
the water; and
the additive, and in the same proportions as in the cement composition develops a compressive strength of at least 1,800 psi (12.4 MPa) when tested at 24 hours, a temperature of 190°
F. (88°
C.), and a pressure of 3,000 psi (20.7 MPa), and wherein the compressive strength of the test cement composition at a final time of 72 hours has a percent change greater than −
5% from the compressive strength of the test cement composition at an initial time of 24 hours when tested at a temperature of 300°
F. (149°
C.) and a pressure of 3,000 psi (20.7 MPa); andallowing the cement composition to set, wherein the step of allowing is performed after the step of introducing.
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18. A method of cementing in a subterranean formation comprising:
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introducing a cement composition into the subterranean formation, wherein the cement composition comprises; cement; water; and an additive, wherein the additive is a pozzolan and a strength-retrogression inhibitor, wherein the additive includes at least the compounds silicon dioxide (SiO2), iron III oxide (Fe2O3), and aluminum oxide (Al2O3), and wherein the ratio of SiO2 to Fe2O3 to Al2O3 is in the range of 1;
0.2;
0.2 to 1;
0.35;
0.3; andallowing the cement composition to set, wherein the step of allowing is performed after the step of introducing.
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Specification