FIELD: chemistry.
SUBSTANCE: invention is intended for extraction of bypass, film and capillary-retained oils. Composition for increasing oil recovery contains zwitterionic surfactant - zwitterionic surfactant of oleyl amidopropyl dimethyl-betaine, or cocamidopropyl betaine, or alkyl sulphobetaine, or alkyl dimethyl amine oxide, sodium silicate, sodium chloride, water in following ratio of components, wt. %: zwitterionic surfactant 0.5–10, sodium silicate 0.5–15, sodium chloride 0–25, water is the rest.
EFFECT: technical result is increase of oil yield from highly mineralized formations.
1 cl, 22 ex, 1 tbl
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