METHOD FOR DISPLACEMENT OF RESIDUAL OIL Russian patent published in 1994 - IPC

FIELD: oil producing industry. SUBSTANCE: injected into formation with temperature of up to 90 C and formation water mineralization up to 50 g/l is aqueous solution of mixture of product of combined processing of acid tar oils and oxyethylated alkyl phenols of AF 9-n type where n is number of oxide groups of ethylene equalling 4-12 (neftenol) with concentration of 1.0-30.0 g/l with product of condensation of tertiary amine with benzyl chloride with concentration of 1.0-30.0 g/l and following formula R(CH₃)₂NCH₂C₆H₅Cl, where R is mixture of alkyl residues C₁₀-C₁₈. In this case, mixture is injected into formation in the amount of 1-2 pore volumes of treated formation. EFFECT: higher efficiency. 1 tbl