FIELD: chemistry.
SUBSTANCE: composition for enhanced oil recovery contains a surfactant, boric acid, sodium tetraborate - Na2B4O7⋅10H2O drill⋅ and water, contains a complex surfactant Neftenol VVD or a mixture of an nonionic surfactant - neonol AF 9-12, or NP-40, or NP-50 and an anionic surfactant - volgonate, or sulfonol, or NPS-6 in a 2:1 ratio, as a surfactant, and additionally - carbamide and glycerin at the following ratio of components, wt %: the said complex surfactant 1.0-4.0, boric acid 1.0-10.0, sodium tetraborate 1.0-10.0, urea 5.0-10.0, glycerol 10.0-70.0, water - the rest.
EFFECT: increased buffer capacity of the composition in the optimal pH range for oil displacement, where the surfactants are chemically stable and have the maximum detergency.
9 ex, 2 tbl, 5 dwg
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