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The present invention provides improved foamed well cement slurries, additives and methods. The additives, which foam and stabilize a cement slurry containing fresh water or salt water, are basically comprised of a mixture of an ethoxylated alcohol ether sulfate surfactant, an alkyl or alkene amidop

The present invention provides improved foamed well cement slurries, additives and methods. The additives, which foam and stabilize a cement slurry containing fresh water or salt water, are basically comprised of a mixture of an ethoxylated alcohol ether sulfate surfactant, an alkyl or alkene amidopropyl betaine surfactant and an alkyl or alkene amidopropyl dimethyl amine oxide surfactant.

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[ What is claimed is:] [1.] A foamed cement slurry for cementing a well comprising:a hydraulic cement;sufficient water to form a pumpable slurry;sufficient gas to form a foam; andan effective amount of an additive for foaming and stabilizing said slurry comprised of an ethoxylated alcohol ether sulf

[ What is claimed is:] [1.] A foamed cement slurry for cementing a well comprising:a hydraulic cement;sufficient water to form a pumpable slurry;sufficient gas to form a foam; andan effective amount of an additive for foaming and stabilizing said slurry comprised of an ethoxylated alcohol ether sulfate surfactant of the formul aEQU H(CH.sub.2).sub.a (OC.sub.2 H.sub.4).sub.b OSO.sub.3 NH.sub.4.sup.+wherein a is an integer in the range of from about 6 to about 10 and b is an integer in the range of from about 3 to about 10 and said ethoxylated alcohol ether sulfate surfactant is present in said additive in an amount in the range of from about 60 to about 64 parts by weight, an alkyl or alkene amidopropyl betaine surfactant having the formulaEQU R--CONHCH.sub.2 CH.sub.2 CH.sub.2 N.sup.+ (CH.sub.3).sub.2 CH.sub.2 CO.sub.2.sup.-wherein R is a radical selected from the group of decyl, cocoyl, lauryl, cetyl and oleyl and said alkyl or alkene amidopropyl betaine surfactant is present in said additive in an amount in the range of from about 30 to about 33 parts by weight and an alkyl or alkene amidopropyl dimethyl amine oxide surfactant having the formulaEQU R--CONHCH.sub.2 CH.sub.2 CH.sub.2 N.sup.+ (CH.sub.3).sub.2 O.sup.-wherein R is a radical selected from the group of decyl, cocoyl, lauryl, cetyl and oleyl and said alkyl or alkene amidopropyl dimethyl amine oxide surfactant is present in said additive in an amount in the range of from about 3 to about 10 parts by weight.