Well acidizing compositions and method
First Claim
1. A concentrate which forms an acid internal microemulsion well treatment composition when added to an acid treatment fluid, comprising:
- (a) in the range of from about 20% to about 98% by weight of a hydrocarbon carrier fluid;
(b) in the range of from about 1% to about 50% by weight of an alkyl alcohol having in the range of from 4 to 18 carbon atoms; and
(c) int he range of from about 1% to about 50% by weight of an emulsifying agent comprising at least one compound selected from the group consisting of amine salts having ester or amide linkages and propoxylated alcohols, each of said components (a)-(c) being different compounds or different mixtures of compounds.
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Abstract
A concentrate which forms an acid internal microemulsion well treatment composition when added to an acid treatment fluid. The concentrate comprises in the range of from about 20% to about 98% by weight of a hydrocarbon carrier fluid, in the range of from about 1% to about 50% by weight of an alkyl alcohol having from 4 to 18 carbon atoms and in the range of from about 1% to about 50% by weight of an emulsifying agent comprising at least one compound selected from the group consisting of sulfate esters, phosphate esters, alkyl aromatic sulfonic acids, amine salts having ester or amide linkages, quaternary ammonium compounds having ester of amide linkages, propoxylated fatty acids, and propoxylated alcohols. Also disclosed are an acid internal microemulsion well treatment composition and a method of treating a subterranean formation to increase the production of hydrocarbons therefrom.
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Citations
38 Claims
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1. A concentrate which forms an acid internal microemulsion well treatment composition when added to an acid treatment fluid, comprising:
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(a) in the range of from about 20% to about 98% by weight of a hydrocarbon carrier fluid; (b) in the range of from about 1% to about 50% by weight of an alkyl alcohol having in the range of from 4 to 18 carbon atoms; and (c) int he range of from about 1% to about 50% by weight of an emulsifying agent comprising at least one compound selected from the group consisting of amine salts having ester or amide linkages and propoxylated alcohols, each of said components (a)-(c) being different compounds or different mixtures of compounds. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An acid internal microemulsion well treatment composition comprising:
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(a) in the range of from about 20% to about 97% by weight of a hydrocarbon carrier fluid, said hydrocarbon carrier fluid forming the external phase of the well treatment composition; (b) in the range of from about 1% to about 50% by weight of an alkyl alcohol having in the range of from 4 to 18 carbon atoms for reducing the interfacial tension of the well treatment composition and facilitating formation of the acid into micro size spherical droplets; (c) in the range of from about 1% to about 50% by weight of an emulsifying agent for forming and maintaining a stable acid internal microemulsion, said emulsifying agent comprising at least one compound selected from the group consisting of amine salts having ester or amide linkages and propoxylated alcohols; and (d) in the range of from about 1% to about 50% by weight of an acid treatment fluid microemulsified into said hydrocarbon carrier fluid, each of said components (a)-(d) being different compounds or different mixtures of compounds. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A method of treating a subterranean formation to increase the production of hydrocarbons therefrom comprising contacting said formation with an acid internal microemulsion well treatment composition comprising:
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(a) in the range of from about 20% to about 97% by weight of a hydrocarbon carrier fluid, said hydrocarbon carrier fluid forming the external phase of the well treatment composition; (b) in the range of from about 1% to about 50% by weight of an alkyl alcohol having in the range of from 4 to 18 carbon atoms for reducing the interfacial tension of the well treatment composition and facilitating formation of the acid into micro size spherical droplets; (c) in the range of from about 1% to about 50% by weight of an emulsifying agent for forming and maintaining a stable acid internal microemulsion, said emulsifying agent comprising at least one compound selected from the group consisting of amine salts having ester or amide linkages and propoxylated alcohols; and (d) in the range of from about 1% to about 50% by weight of an acid treatment fluid microemulsified into said hydrocarbon carrier fluid, each of said components (a)-(d) being different compounds or different mixtures of compounds. - View Dependent Claims (17, 18, 19, 20)
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21. A concentrate which forms an acid internal microemulsion well treatment composition when added to an acid treatment fluid, comprising:
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(a) in the range of from about 20% to about 40% by weight of a hydrocarbon carrier fluid selected from the group consisting of kerosene, diesel oil, xylene and mixtures of technical grade aromatic solvents, said hydrocarbon carrier fluid forming the external phase of the well treatment composition then the concentrate is added to an acid treatment fluid; (b) in the range of from about 1% to about 20% by weight of an alkyl alcohol having in the range of from 4 to 12 carbon atoms, said alkyl alcohol reducing the interfacial tension of the well treatment composition and facilitating formation of the acid into micro size spherical droplets when the concentrate is added to an acid treatment fluid; and (c) in the range of from about 1% to about 40% by weight of an emulsifying agent comprising at least one compound selected from the group consisting of amine salts having ester linkages and propoxylated alcohols, said emulsifying agent forming and maintaining a stable acid internal microemulsion when the concentrate is added to an acid treatment fluid and each of said components (a)-(c) being different compounds or different mixtures of compounds. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. An acid internal microemulsion well treatment composition comprising:
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(a) in the range of from about 25% to about 60% by weight of a hydrocarbon carrier fluid selected from the group consisting of kerosene, diesel oil, xylene and mixtures of technical grade aromatic solvents, said hydrocarbon carrier fluid forming the external phase of the well treatment composition; (b) in the range of from about 1% to about 10% by weigh of an alkyl alcohol having in the range of from 4 to 12 carbon atoms, said alkyl alcohol reducing the interfacial tension of the well treatment composition and facilitating formation of the acid into micro size spherical droplets; (c) in the range of from about 10% to about 40% by weight of an emulsifying agent for forming and maintaining a stable acid internal microemulsion, said emulsifying agent comprising at least one compound selected from the group consisting of amine salts having ester linkages and propoxylated alcohols; and (d) in the range of from about 1% to about 40% by weight of an aqueous acid solution including at least one acid selected from the group consisting of hydrochloric acid, acetic acid, citric acid, erythorbic acid, formic acid and hydrofluoric acid, said aqueous acid solution being microemulsified into said hydrocarbon carrier fluid, and each of said components (a)-(d) being different compounds or different mixtures of compounds. - View Dependent Claims (33, 34, 35, 36, 37, 38)
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Specification