# US 5,346,550 A · Low temperature well cementing compositions and methods

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- Number: US 5,346,550 A
- Document ID: US5346550A
- Status: Granted
- Kind: A
- Application number: 08/112,826
- Filed: 1993-08-26
- Granted: 1994-09-13
- Earliest claimed: 1992-02-05
- Assignees: Halliburton Company
- Inventors: Robert A. Kunzi; Edward F. Vinson; Patty L. Totten; Bobby G. Brake
- Web page: https://patentgrep.com/patent/US5346550A

## CPC

- C04B 28/14: containing calcium sulfate cements {(gypsum-paper plates E04C)}
- C09K 8/46: containing inorganic binders, e.g. Portland cement
- C04B 2111/76: Use at unusual temperatures, e.g. sub-zero
- Y02W 30/91: Use of waste materials as fillers for mortars or concrete
- Y10S 106/01: Fly ash
- 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
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- Y02W: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

Improved hydraulic cement compositions and methods for cementing wells drilled through low temperature earth formations wherein the cement is subjected to freeze-thaw cycling are provided. The compositions are comprised of a hydraulic cement, gypsum cement, fly ash, an alkali metal halide, water, and an alcohol freezing point depressant.

## Claims

### Claim 1

An improved hydraulic cement composition for cementing wells drilled through low temperature earth formations comprising:
a hydraulic cement present in said composition in an amount in the range of from about 5 pounds to about 30 pounds per sack;
gypsum cement present in an amount in the range of from about 25 pounds to about 50 pounds per sack;
fly ash present in an amount in the range of from about 5 pounds to about 30 pounds per sack;
an alkali metal halide present in an amount in the range of from about 1 pound to about 18 pounds per sack; and
water present in an amount in the range of from about 2 gallons to about 12 gallons per sack,
an alcohol freezing point depressant present in said composition in an amount in the range of from about 1% to about 18% by weight of the water in said composition.

### Claim 2 (depends on 1)

The composition of claim 1 wherein said hydraulic cement is selected from the group consisting of API classes A, B, C, G and H Portland cement.

### Claim 3 (depends on 1)

The composition of claim 1 wherein said fly ash is selected from the group consisting of ASTM classes F and C fly ash.

### Claim 4 (depends on 1)

The composition of claim 1 wherein said alkali metal halide is sodium chloride.

### Claim 5 (depends on 1)

The composition of claim 1 wherein said alcohol freezing point depressant is ethylene glycol.

### Claim 6 (depends on 1)

The composition of claim 1 which further comprises a dispersing agent present in said composition in an amount up to about 1 pound per sack.

### Claim 7 (depends on 6)

The composition of claim 6 wherein said dispersing agent is selected from the group consisting of sodium salts of naphthalene sulfonic acid condensed with formaldehyde and mixtures thereof with polyvinylpyrrolidone, and polymers prepared by the caustic catalyzed condensation of formaldehyde with acetone wherein the polymers contain sodium sulfate groups.

### Claim 8 (depends on 1)

The composition of claim 1 which further comprises a fluid loss control additive present in said composition in an amount up to about 2 pounds per sack.

### Claim 9 (depends on 8)

The composition of claim 8 wherein said fluid loss control additive is selected from the group consisting of hydrolyzed copolymers of N,N-dimethylacrylamide and 2-acrylamido, 2-methyl propane sulfonic acid.

### Claim 10

An improved hydraulic cement composition for cementing wells drilled through low temperature earth formations comprising:
a hydraulic cement selected from the group consisting of API classes A, B, C, G and H Portland cement present in said composition in an amount in the range of from about 12 pounds to about 20 pounds per sack;
gypsum cement present in an amount in the range of from about 35 pounds to about 41 pounds per sack;
fly ash selected from the group consisting of ASTM classes F and C fly ash present in an amount in the range of from about 12 pounds to about 17 pounds per sack;
an alkali metal chloride salt present in an amount in the range of from about 3 pounds to about 5 pounds per sack;
a dispersing agent comprised of a mixture of polyvinylpyrrolidone and a sodium salt of naphthalene sulfonic acid condensed with formaldehyde present in said composition in an amount in the range of from about 0.1 pound to about 0.35 pound per sack;
water present in an amount in the range of from about 2.8 gallons to about 9.2 gallons per
sack; and
ethylene glycol present in an amount in the range of from about 2% to about 7% by weight of water in said composition.

### Claim 11 (depends on 10)

The composition of claim 10 wherein said cement is API class G Portland cement, said fly ash is ASTM class F fly ash and said alkali metal chloride salt is sodium chloride.