Keywords
Citation
(2001), "Acid corrosion inhibitor", Anti-Corrosion Methods and Materials, Vol. 48 No. 5. https://doi.org/10.1108/acmm.2001.12848ead.001
Publisher
:Emerald Group Publishing Limited
Copyright © 2001, MCB UP Limited
Acid corrosion inhibitor
Acid corrosion inhibitor
Keywords: Nalco/Exxon Energy Chemicals, Corrosion inhibitors, Patents
In GB Patent 2351077 Nalco/Exxon Energy Chemicals, LP describe an acid corrosion inhibitor for petroleum wells and water wells subjected to stimulation with acid solutions. It comprises cinnamaldehyde and an organo-sulphur compound. The organo-sulphur compound may be thioethanol, 1-thio-2-butanol, 1,2-ethanedithiol, 1,3-dibutylthiourea, 1,3-diethylthiourea, 2-aminoethanethiol, 2-imino-4thiobiuret, 2-mercaptobenzothiazole, 2-mercaptothiazoline, ammonium thiosulphate, dithiodipropionic acid, glycol dimercaptoacetate, mercaptosuccinic acid, sodium tetrathionate, sodium thiocyanate, sodium thiosulfate, tetrainethylthiuram monosulfide, thiazolidine, thioglycerol, thiolactic acid, cysteine, cystine, methionine or thiourea. The inhibitor may also comprise iodine, and potassium iodide and/or formic acid as an extender. The corrosion inhibitor may also comprise a quatenary salt. The inhibitor provides a reduced rate of corrosion and fewer instances of pitting than cinnamaldehyde alone, through synergistic action between the cinnamaldehyde and organo-sulphur compound. The inhibitor does not suffer from oil field al-dehyde/polyacrylamide cross-linking incompatibility.