FIELD: oil and gas production. SUBSTANCE: into bed, alkaline agent constituting aqueous solution of alkali and/or salt of monovalent cation and polybasic mineral acid is pumped in followed by an anionic surfactant, namely boiled-off liquor - plasticizer for construction work. EFFECT: enhanced efficiency due to replacing oil caused by reduced hardness of mineralized water. 2 cl, 1 tbl
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