SOLUTION FOR REMOVAL OF POLYMER MUD FILL OF ACRYLIC SERIES Russian patent published in 1995 - IPC

FIELD: oil producing industry. SUBSTANCE: removal of polymer mud fill of acrylic series from well and producing formation in elimination of complications in well drilling, treatment of wellbore before cementation of casing string, repeated exposing of producing formation, completion and overhaul of well are accomplished due to the fact solution used for the purpose includes water-soluble salts of phosphoric acid:sodium or ammonium or othophosphates or potassium orthophosphate (10-24 mas.), surfactant (0.5-1.5) mas.), water (73.5-89.5 mas.); and sodium orthophosphate is used in form of monosodium phosphate, or disodium phosphate, or trisodium phosphate, and ammonium orthophosphate, in form of monoammonium phosphate, or diammonium phosphate, or triammonium phosphate. EFFECT: higher efficiency. 1 tbl