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US 6,063,738 AGranted
Foamed well cement slurries, additives and methods
AssigneeHalliburton Energy Services, Inc.
InventorsJiten Chatterji, Roger S. Cromwell, Frank Zamora, Bobby J. King
Life of this patent
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Abstract
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.
Claims25
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;
- and
- an effective amount of an additive for foaming and stabilizing said slurry comprised of an ethoxylated alcohol ether sulfate surfactant of the formul a
- 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 formula
- 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 formula
- 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.
8 more elements
An additive for foaming and stabilizing a cement slurry containing fresh water or salt water comprising:
- an ethoxylated alcohol ether sulfate surfactant of the formula
- 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 formula
- 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 formula
- 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.
7 more elements
A method of cementing a subterranean zone penetrated by a well bore comprising the steps of:
- (a) forming a foamed cement slurry comprised of hydraulic cement, sufficient water to form a pumpable slurry, sufficient gas to form a foam and an effective amount of an additive for foaming and stabilizing said slurry comprised of an ethoxylated alcohol ether sulfate surfactant of the formula
- 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 formula
- 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 formula
- 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;
- (b) placing said foamed cement slurry into said subterranean zone by way of said well bore;
- and
- (c) allowing said foamed cement slurry to set into a hard impermeable mass.
7 more elements
Dependencies are inferred from the claim text.