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US 5,346,550 AGranted
Low temperature well cementing compositions and methods
AssigneeHalliburton Company
InventorsRobert A. Kunzi, Edward F. Vinson, Patty L. Totten, Bobby G. Brake
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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.
Claims11
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.
4 more elements
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.
6 more elements
Dependencies are inferred from the claim text.