Acid corrosion inhibitor
AssigneeNalco/Exxon Energy Chemicals, L.P.
InventorsMark A. Vorderbruggen, Dennis A. Williams
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Abstract
An acid corrosion inhibitor composition is provided for petroleum wells and water wells subjected to stimulation with acid solutions. The inhibitor combines cinnamaldehyde and an organo-sulfur compound. The inhibitor provides a reduced rate of corrosion and fewer instances of pitting than inhibitors which include cinnamaldehyde alone. The inhibitor does not suffer from the well-known oil field aldehyde/polyacrylamide crosslinking incompatibility. The enhanced performance by the inhibitor of the present invention is provided by a synergistic action between the cinnamaldehyde and an organo-sulfur compound.
Claims15
A corrosion inhibitor comprising:
- cinnamaldehyde and at least one organo-sulfur compound selected from the group consisting of thioethanol, 1-thio-2-butanol 1,2-ethanedithiol, 1,3-dibutylthiourea, 1,3-diethylthiourea, 2-aminoethanethiol, 2-imino-4-thiobiuret, 2-mercaptobenzothiazole, 2-mercaptothiazoline, ammonium thiosulfate, dithiodipropionic acid, glycol dimercaptoacetate, mercaptosuccinic acid, sodium tetrathionate, tetramethylthiuramn monosulfide, thiazolidine, thioglycerol, cysteine, cystine, methionine, and thiourea;
- and wherein the inhibitor is free of alkylphenyl ethoxy compounds.
A composition for stimulating production of petroleum wells comprising:
- an acid, and a corrosion inhibitor comprising cinnamaldehyde and at least one organo-sulfur compound selected from the group consisting of thioethanol, 1-thio-2-butanol, 1,2-ethanedithiol, 1,3-dibutylthiourea, 1,3-diethylthiourea, 2-aminoethanethiol, 2-imino-4-thiobiuret, 2-mercaptobenzothiazole, 2-mercaptothiazoline, ammonium thiosulfate, dithiodipronionic acid, glycol dimercaptoacetate, mercaptosuccinic acid, sodium tetrathionate, tetramethylthiuram monosulfide, thiazolidine, thioglycerol, cysteine, cystine, methionine, and thiourea;
- and wherein the inhibitor is free of alkylphenyl ethoxy compounds.
A method of stimulating production of a water or petroleum well comprising:
- injecting a combination of an acidic composition and a corrosion inhibitor into the well, the corrosion inhibitor comprising cinnamaldehyde and at least one organo-sulfur compound selected from the group consisting of thioethanol, 1-thio-2-butanol, 1,2-ethanedithiol, 1,3-dibutylthiourea, 1,3-diethylthiourea, 2-aminoethanethiol, 2-imino-4-thiobiuret, 2-mercaptobenzothiazole, 2-mercaptothiazoline, ammonium thiosulfate, dithiodipropionic acid, glycol dimercaptoacetate, mercaptosuccinic acid, sodium tetrathionate, tetramethylthiuram monosulfide, thiazolidine, thioglycerol, cysteine, cystine, methionine, and thiourea;
- and wherein the inhibitor is free of alkylphenyl ethoxy compounds.
A corrosion inhibitor comprising:
- from about 5.0% to about 40% cinnamaldehyde;
- from about 1.0% to about 10% thioethanol;
- from about 5.0% to about 40% benzyl chloride quinoline quaternary salt;
- from about 10% to about 30% of a surfactant;
- from about 0.15% to about 1.5% iodine;
- and
- from about 10% to about 50% formic acid.
Dependencies are inferred from the claim text.