Acidizing subterranean formations useful for stimulating oil or gas production from subterranean reservoirs includes using acid solution containing quaternary ammonium salt as corrosion inhibitor

摘要

Process for acidizing subterranean formations by pumping an aqueous solution containing hydrofluoric, hydrochloric, formic and/or acetic acid and optionally a nonionic surfactant through tubing into the formation comprises adding a quaternary ammonium salt (I) to the solution. Process for acidizing subterranean formations by pumping an aqueous solution containing hydrofluoric, hydrochloric, formic and/or acetic acid and optionally a nonionic surfactant through tubing into the formation comprises adding a quaternary ammonium salt of formula (I) to the solution: R1-R3 = 1-4C alkyl or hydroxyalkyl, aryl, alkaryl or (CnH2nO)pCOR5; A = an anion; n = 2 or 3; p = 1-3; R5 = 7-23C alkyl with 0-3 double bonds; R4 = (CnH2nO)pCOR5 or a group of formula (II): Z = (CH2)m or (CH2)m-X-CO-D-CO-X-(CH2)m; m = 1-6; X = NH or O; D = 36-54C dimer fatty acid residue.