Patent ID: 7255170

Claim:
A method of cementing, comprising: providing a foamed cement composition comprising: a hydraulic cement; water; a gas; and a foaming and stabilizing additive comprising a mixture of an alkali salt of an alkyl ether sulfate surfactant, wherein the alkali salt of the alkyl ether sulfate surfactant comprises a mixture of an alkali salt of a C 6-10 alkyl ether sulfate surfactant, and an alkali salt of a C 2-4 alkyl ether sulfate surfactant, an alkyl or alkene amidopropyl betaine surfactant having the formula R—CONHCH 2 CH 2 CH 2 N + (CH 3 ) 2 CH 2 CO 2 , wherein R is a decyl, a cocoyl, a lauryl, a cetyl, or an oleyl radical, an alkyl or alkene amidopropyl dimethylamine oxide surfactant having the formula R—CONHCH 2 CH 2 CH 2 N + (CH 3 ) 2 O − , wherein R is a decyl, a cocoyl, a lauryl, a cetyl, or an oleyl radical, sodium chloride, and water; placing the foamed cement composition in a location to be cemented; and allowing the foamed cement composition to set therein.