# US 2014/0196901 A1 · Cement composition containing an additive of a pozzolan and a strength retrogression inhibitor

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- Number: US 2014/0196901 A1
- Document ID: US20140196901A1
- Status: Published application
- Kind: A1
- Application number: 13/739,992
- Filed: 2013-01-11
- Published: 2014-07-17
- Earliest claimed: 2013-01-11
- Assignees: Halliburton Energy Services, Inc.
- Applicants: Halliburton Energy Services, Inc.
- Inventors: Rahul C. PATIL; Ramesh MUTHUSAMY; Sheetal SINGH; Abhimanyu DESHPANDE
- Web page: https://patentgrep.com/patent/US20140196901A1

## CPC

- C09K 8/467: containing additives for specific purposes
- C04B 14/00: Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone (expanding or defibrillating materials C04B20/00)
- C04B 18/025: {Grog}
- C04B 28/04: Portland cements
- E21B 33/13: Methods or devices for cementing, for plugging holes, crevices or the like
- C04B 2103/0088: {Compounds chosen for their latent hydraulic characteristics, e.g. pozzuolanes}
- C04B 2111/00215: {Mortar or concrete mixtures defined by their oxide composition}
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE
- E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS

## 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.

## Claims

### 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; and
allowing the cement composition to set, wherein the step of allowing is performed after the step of introducing.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the cement is selected from the group consisting of Portland cements, gypsum cements, high alumina content cements, slag cements, high magnesia content cements, and combinations thereof.

### Claim 3 (depends on 1)

The method according to claim 1, wherein the water is selected from the group consisting of freshwater, brackish water, saltwater, and any combination thereof.

### Claim 4 (depends on 1)

The method according to claim 1, wherein the additive includes at least the compounds silicon dioxide (SiO2), iron III oxide (Fe2O3), and aluminum oxide (Al2O3).

### Claim 5 (depends on 4)

The method according to claim 4, wherein the SiO2, Fe2O3, and Al2O3, comprise at least 70% of the total chemical composition of the additive.

### Claim 6 (depends on 4)

The method according to claim 4, wherein the concentration of the SiO2, Fe2O3, and Al2O3, is a percentage such that the additive is a pozzolan and a strength retrogression inhibitor.

### Claim 7 (depends on 4)

The method according to claim 4, 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.

### Claim 8 (depends on 4)

The method according to claim 4, 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.

### Claim 9 (depends on 4)

The method according to claim 4, wherein the ratio of SiO2 to Fe2O3 to Al2O3 is a ratio such that the additive is a pozzolan and a strength retrogression inhibitor.

### Claim 10 (depends on 1)

The method according to claim 1, wherein the particle size of the additive is selected such that the mixture consisting essentially of: the additive; water; and the 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).

### Claim 11 (depends on 1)

The method according to claim 1, wherein the particle size of the additive is selected such that the cement composition develops a compressive strength of at least 2,000 psi (13.8 MPa) at a time of 24 hours, a temperature of 190° F. (88° C.), and a pressure of 3,000 psi (20.7 MPa).

### Claim 12 (depends on 1)

The method according to claim 1, wherein the additive has a particle size distribution such that at least 90% of the additive has a particle size in the range of about 30 microns to 75 microns.

### Claim 13 (depends on 1)

The method according to claim 1, wherein the cement composition has a compressive strength of +/−20% compared to a control cement composition consisting of cement and water at any time, a temperature of 300° F. (149° C.), and a pressure of 3,000 psi (20.7 MPa).

### Claim 14 (depends on 1)

The method according to claim 1, wherein the compressive strength of the test cement composition at a final time of 72 hours has a percent change greater than 20% from the compressive strength of the test cement composition at an initial time of 6 hours when tested at a temperature of 300° F. (149° C.) and a pressure of 3,000 psi (20.7 MPa).

### Claim 15 (depends on 1)

The method according to claim 1, wherein the concentration of the additive is selected such that the percent change of the compressive strength of the test cement composition or the cement composition is greater than −5% at a final time of 72 hours and an initial time of 24 hours.

### Claim 16 (depends on 1)

The method according to claim 1, wherein the percent change is greater than +2%.

### Claim 17 (depends on 1)

The method according to claim 1, wherein the additive is in a concentration in the range of about 2% to about 70% by weight of the cement.

### Claim 18 (depends on 1)

The method according to claim 1, wherein the subterranean formation has a bottomhole temperature in the range of about 35° F. (2° C.) to about 450° F. (232° C.).

### Claim 19

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, and 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); and
allowing the cement composition to set, wherein the step of allowing is performed after the step of introducing.

### Claim 20

A cement composition comprising:
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 (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).