Surfactant additive for oil field acidizing
First Claim
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1. In a method of acidizing a subterranean oil-bearing formation wherein an aqueous acid solution is injected into the formation, the improvement wherein the aqueous acid solution contains an effective amount of a surfactant to reduce sludge or emulsion formation resulting from the acid solution contacting formation oil, said surfactant having the following formula:
- ##STR4## where R1 is a linear or branched alkyl group having from 4 to 24 carbon atoms;
R2 is selected from an alkyl group having from 1 to 12 carbon atoms or M+ ; and
M+ is selected from ammonium, amines, ethanol amines or a metal mono or di cation.
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Abstract
Subterranean oil-bearing formations are treated with aqueous acid solutions which include an effective amount of an ester or salts of sulfonated fatty acids, which exhibits both antisludge and demulsification properties.
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12 Claims
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1. In a method of acidizing a subterranean oil-bearing formation wherein an aqueous acid solution is injected into the formation, the improvement wherein the aqueous acid solution contains an effective amount of a surfactant to reduce sludge or emulsion formation resulting from the acid solution contacting formation oil, said surfactant having the following formula:
- ##STR4## where R1 is a linear or branched alkyl group having from 4 to 24 carbon atoms;
R2 is selected from an alkyl group having from 1 to 12 carbon atoms or M+ ; and
M+ is selected from ammonium, amines, ethanol amines or a metal mono or di cation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- ##STR4## where R1 is a linear or branched alkyl group having from 4 to 24 carbon atoms;
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