Foamed cement slurries, additives and methods
AssigneeHalliburton Energy Services, Inc.
InventorsJiten Chatterji, D. Chad Brenneis, Bobby J. King, Roger S. Cromwell, Dennis W. Gray
Life of this patent
Estimating the term…
Abstract
The present invention relates to foamed cement slurries, additives and methods. A foamed cement slurry of the invention comprises a hydraulic cement, sufficient water to form a slurry, sufficient gas to form a foam and an environmentally benign foaming and stabilizing additive comprising a mixture of an ammonium salt of an alkyl ether sulfate surfactant, a cocoamidopropyl betaine surfactant, a cocoamidopropyl dimethylamine oxide surfactant, sodium chloride and water.
Claims25
A method of cementing comprising the steps of:
- providing a foamed cement slurry comprising a hydraulic cement, water, a gas, and a foaming and stabilizing additive comprising a mixture of an ammonium salt of an alkyl ether sulfate surfactant, cocoamidopropyl betaine surfactant, cocoamidopropyl dimethylamine oxide surfactant, sodium chloride and water, wherein the ammonium salt of the alkyl ether sulfate surfactant comprises a mixture of an ammonium salt of a C6-10 alkyl ether sulfate surfactant, an ammonium salt of a C4 alkyl ether sulfate surfactant, and an ammonium sulfate;
- placing the foamed cement slurry in a location to be cemented;
- and
- allowing the cement slurry to set.
A method of cementing a subterranean zone penetrated by a well bore comprising the steps of:
- providing a foamed cement slurry comprising a hydraulic cement, water, a gas, and a foaming and stabilizing additive comprising a mixture of an ammonium salt of an alkyl ether sulfate surfactant, cocoamidopropyl betaine surfactant, cocoamidopropyl dimethylamine oxide surfactant, sodium chloride and water, wherein the ammonium salt of the alkyl ether sulfate surfactant comprises a mixture of an ammonium salt of a C6-10 alkyl ether sulfate surfactant, an ammonium salt of a C4 alkyl ether sulfate surfactant, and an ammonium sulfate;
- placing the foamed cement slurry in the subterranean zone by way of the well bore;
- and
- allowing the foamed cement slurry to set into a hard impermeable mass.
Dependencies are inferred from the claim text.