Emulsified acid comprising waste oil for acidizing geological formations
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1. A method of acidizing a subterranean geological formation surrounding a wellbore, comprising:
- injecting an emulsified acid into the wellbore to acidize the subterranean geological formation,wherein the emulsified acid comprises60-72% by volume of an aqueous phase comprising hydrochloric acid,25-35% by volume of an oil phase comprising a waste oil, and0.1-3.0% by volume of an emulsifier, relative to the total volume of the emulsified acid, andwherein the waste oil comprises 23-24% by weight paraffins, 9-10% by weight naphthenes, 18-20% by weight polynaphthenes, 18-20% by weight monoaromatics, 10-12% by weight naphthenomonoaromatics, 9-10% by weight diaromatics, 3-4% by weight naphthenodiaromatics, 2-3% by weight triaromatics, and 1-3% by weight naphthenotriaromatics, each relative to a total weight of the waste oil.
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Abstract
A method of acidizing a subterranean geological formation by injecting an emulsified acid into a wellbore, wherein the emulsified acid includes at least an aqueous phase comprising a hydrochloric acid solution, an oil phase comprising waste oil, and an emulsifier, and wherein the waste oil contains 45-75% by weight of aromatic compounds and preferably contains less than 0.5% by weight of non-hydrocarbon compounds. Various embodiments, and combinations of embodiments, of the emulsified acid and the method of acidizing are provided.
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17 Claims
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1. A method of acidizing a subterranean geological formation surrounding a wellbore, comprising:
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injecting an emulsified acid into the wellbore to acidize the subterranean geological formation, wherein the emulsified acid comprises 60-72% by volume of an aqueous phase comprising hydrochloric acid, 25-35% by volume of an oil phase comprising a waste oil, and 0.1-3.0% by volume of an emulsifier, relative to the total volume of the emulsified acid, and wherein the waste oil comprises 23-24% by weight paraffins, 9-10% by weight naphthenes, 18-20% by weight polynaphthenes, 18-20% by weight monoaromatics, 10-12% by weight naphthenomonoaromatics, 9-10% by weight diaromatics, 3-4% by weight naphthenodiaromatics, 2-3% by weight triaromatics, and 1-3% by weight naphthenotriaromatics, each relative to a total weight of the waste oil. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification