Method of emulsifying an acid and acidizing a geological formation
AssigneeKing Fahd University of Petroleum and Minerals
InventorsAbdullah S. Sultan, Ziad Sidaoui
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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.
Claims11
A method of emulsifying an acid and acidizing a subterranean geological formation surrounding a wellbore, comprising:
- mixing a waste oil with an emulsifier acid to form an acidized waste oil;
- mixing the acidized waste oil with a mixture of water and HCl to form an emulsified acid comprising an oil phase and an aqueous phase;
- injecting the emulsified acid into the wellbore to acidize the subterranean geological formation,
- wherein the emulsified acid comprises
- 60-72% by volume of the aqueous phase comprising hydrochloric acid,
- 25-35% by volume of the oil phase comprising the 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.
Dependencies are inferred from the claim text.