METHOD OF BOTTOM-HOLE ACIDIZING Russian patent published in 1999 - IPC

FIELD: oil producing industry, particularly treatment of bottom-hole formation zone of producing formation. SUBSTANCE: method includes introduction into acid of demulsifying additive in form of block copolymer of ethylene and propylene oxides based on propylene glycol or mixture of block copolymer of ethylene and propylene oxides based on propylene glycol with o-alkyl phosphite of N-alkyl ammonium in ratio of 48:53 and in amount of 0.010-0.013 wt.%. EFFECT: higher efficiency of treatment and subsequent rapid and full removal of treated compounds. 3 tbl