FIELD: oil and gas industry.
SUBSTANCE: invention is referred to oil recovery and enhanced oil recovery method. The subsurface oil recovery method includes subsurface injection of aqueous compound, which contains alkyl- or alkenyl oligoglycoside as per the specified general formula as a surfactant and additional surfactant, wherein the aqueous compound contains anionic surfactants selected from alkoxylated alkyl(alkenyl)sulphates as the additional surfactant, at that content of alkyl- or alkenyl oligoglycoside is equal to 0.01-6 wt %, weight ratio of alkyl- or alkenyl oligoglycoside and the specified additional surfactant in the formula (I) is equal from 10:90 up to 90:10, and water in the above aqueous compound has the full level of dissolved salts up to about 200000 ppm. The invention is developed in the secondary claims.
EFFECT: improving efficiency at high temperature, salt content, pressure and concentration of sulphions.
5 cl, 4 tbl, 18 ex
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