METHOD OF TREATING SUBTERRANEAN FORMATIONS BY IN-SITU HYDROLYSIS OF ORGANIC ACID ESTERS
First Claim
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1. A method of treating an oil or gas well penetrating a formation which comprises:
- (a) introducing into the oil or gas well a well treatment fluid comprising an organic ester; and
(b) hydrolyzing the organic ester in-situ to produce acid wherein the well treatment fluid is either (i) an oil-in-water emulsion of an emulsifier and the organic ester;
or (ii) a homogeneous solution of organic ester and a water/mutual solvent solution.
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Abstract
An oil or gas well penetrating a subterranean formation, such as a carbonate formation, is treated with a well treatment fluid which contains an organic ester. The fluid may be an oil-in-water emulsion of the organic ester and an emulsifier or a homogeneous solution of organic ester and a water/mutual solvent solution. Acid is produced in-situ by hydrolysis of the organic ester.
87 Citations
20 Claims
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1. A method of treating an oil or gas well penetrating a formation which comprises:
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(a) introducing into the oil or gas well a well treatment fluid comprising an organic ester; and (b) hydrolyzing the organic ester in-situ to produce acid wherein the well treatment fluid is either (i) an oil-in-water emulsion of an emulsifier and the organic ester;
or (ii) a homogeneous solution of organic ester and a water/mutual solvent solution. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of matrix acidizing a carbonate subterranean formation penetrated by an oil or gas well which comprises:
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(a) injecting into the well a well treatment fluid comprising an organic acid ester; and (b) hydrolyzing the organic ester in-situ to produce acid (c) increasing the permeability of the carbonate subterranean formation wherein the well treatment fluid is either (i) an oil-in-water emulsion of an emulsifier and the organic ester;
or (ii) a homogeneous solution of organic ester and a water/mutual solvent solution. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A method of matrix acidizing a carbonate formation penetrated by an oil or gas well which comprises:
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(a) injecting into the well a well treatment fluid selected from the group consisting of; (i) an oil-in-water emulsion comprising an organic acid ester and a surfactant;
or(ii) a homogeneous solution of organic acid ester in a water/mutual solvent solution; (b) shutting-in the well; (c) producing acid in-situ by hydrolyzing the organic acid ester; and (d) increasing the permeability of the carbonate formation wherein the organic acid ester is selected from the group consisting of methyl p-toluenesulfonate, ethyl p-toluenesulfonate, methyl methanesulfonate and ethyl methanesulfonate. - View Dependent Claims (19, 20)
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Specification