Viscoelastic surfactant composition having improved rheological properties and method of using for treating subterranean formations
First Claim
1. A surfactant composition comprising (i) one or more quaternized amidoamine surfactants of formula I-IV, or a combination thereof wherein R1 and R7 are independently selected from the group consisting of C12-C30 alkyl, C12-C30 alkenyl, C12-C30 arylalkyl and C12-C30 cycloalkylalkyl;
- R2 and R3 are independently selected at each occurrence from hydrogen and C1-C4 alkyl;
R4, R5, R6, R8 and R9 are independently selected from C1-C4 alkyl, C1-C4 alkoxyalkyl and C1-C4 hydroxyalkyl;
X and Y are independently selected from halide, alkyl sulfate and sulfate;
p is an integer from 1 to about 10;
m and n are independently integers of 1 to about 4;
Z is —
CH2(CH2)qCH2SO3−
or —
CH2CH(OH)CH2SO3−
; and
q is 1 or 2, (ii) one or more tertiary amine amides of formula V or VI, or a combination thereof wherein R1, R2, R3, R4, R5, R7, R8, p, m and n are as defined in step (i); and
(iii) one or more polymeric acids.
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Abstract
A viscoelastic surfactant composition having improved rheological performance comprising one or more quaternized amidoamine surfactants, one or more tertiary amine amides, one or more polymeric acids and one or more electrolytes, viscosified aqueous fluids comprising the surfactant composition and methods of making and using the viscosified aqueous fluid for treating subterranean formations.
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Citations
45 Claims
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1. A surfactant composition comprising
(i) one or more quaternized amidoamine surfactants of formula I-IV, or a combination thereof wherein R1 and R7 are independently selected from the group consisting of C12-C30 alkyl, C12-C30 alkenyl, C12-C30 arylalkyl and C12-C30 cycloalkylalkyl; - R2 and R3 are independently selected at each occurrence from hydrogen and C1-C4 alkyl;
R4, R5, R6, R8 and R9 are independently selected from C1-C4 alkyl, C1-C4 alkoxyalkyl and C1-C4 hydroxyalkyl;
X and Y are independently selected from halide, alkyl sulfate and sulfate;
p is an integer from 1 to about 10;
m and n are independently integers of 1 to about 4;
Z is —
CH2(CH2)qCH2SO3−
or —
CH2CH(OH)CH2SO3−
; and
q is 1 or 2,(ii) one or more tertiary amine amides of formula V or VI, or a combination thereof wherein R1, R2, R3, R4, R5, R7, R8, p, m and n are as defined in step (i); and
(iii) one or more polymeric acids. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 44, 45)
- R2 and R3 are independently selected at each occurrence from hydrogen and C1-C4 alkyl;
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22. A viscosified aqueous surfactant composition comprising
(I) about 1 to about 10 weight percent of a surfactant composition comprising (a) about 20 to about 75 weight percent of a surfactant mixture comprising (a1) about 65 to about 99.4 weight percent of the quaternized amidoamine surfactants of formula I-IV, or a combination thereof, (a2) about 0.5 to about 20 weight percent of the tertiary amine amides of formula V or VI, or a combination thereof and (a3) about 0.1 to about 15 weight percent of the polymeric acid; - and
(b) about 20 to about 75 weight percent of a solvent system comprising (b1) about 0 to about 10 weight percent water, (b2) about 0 to about 45 weight percent of one or more alcohols and (b3) about 0 to about 45 weight percent of one or more glycols and (II) about 0.4 to about 20 weight percent of one or more electrolytes; and
(III) about 80 to about 98.5 weight percent water. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43)
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Specification