FIELD: oil and gas production. SUBSTANCE: in a method of developing oil deposit by selective flooding isolation of strata, sodium silicate-based solution is injected into oil ring formation, sodium silicate solution being preliminarily mixed with ammonium nitrate solution in sweet water until homogeneous solution containing 20-40% sodium silicate and 3-7% ammonium nitrate is obtained, after which water in volume at least twofold superior to volume of oil ring is injected. According to invention, ammonium nitrate solution also includes anionic surfactant (sulfonol) in amounts 1-3% of the weight of sodium silicate-based solution. EFFECT: increased oil recovery factor of formation. 2 cl, 3 dwg, 1 tbl
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