OIL FORMATION DEVELOPMENT METHOD Russian patent published in 2019 - IPC E21B43/22 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil industry, in particular, to methods of oil reservoir development, and can be used in development of heterogeneous permeability of oil formations. In method of oil formation development, including determination of injectivity of injection well, pumping into formation through injection well of suspension of silicate gel and aqueous solution of surfactant and extraction of oil through production wells, first, a fringe of water solution of sodium silicate with concentration of 0.1 to 10 wt% is injected into the formation, then, the silicate gel suspension is pumped to increase pumping pressure by 10–30 %, not exceeding the maximum allowable pumping pressure to the production string or formations, after pumping of the silicate gel suspension, an aqueous solution of surfactant – oxyethylated monoalkylphenol or monoalkylphenyl ether of polyethylene glycol is pumped into the formation with concentration of 0.1–0.5 wt% in volume ratio to volume of pumping of the suspension of silicate gel 1:(1–10), wherein volume of pumping of said aqueous solution of silicate – V_{silicate solution} and concentration of silicate gel suspension – C_{gel suspension}, as well as the ratio of the volume of said surfactant solution – V_{surfactant solution} to volume of pumping of silicate gel suspension – V_{gel suspension} is selected based on intake capacity of injection well – In._well, specifically at In._well 150–250 m³/day – V_{silicate solution} 3–7 m³, C_susp. 0.005–6.0 wt%, V_{surfactant solution}/V_{gel suspension} 1:(1–3), with In._well 250–350 m³/day – V_{silicate solution} 7–12 m³, C_susp. 6.0–12.0 wt%, V_{surfactant solution}/V_{gel suspension} 1:(3–6), with In._well 350–500 m³/day – V_{silicate solution} 12–20 m³, C_susp. 8.0–20.0 wt%, V_{surfactant solution}/V_{gel suspension} 1:(6–10), and after pumping said aqueous solution is carried out in form of water with mineralization from 0.15 to 300 g/dm³ in amount of 10–15 m³ and flooding is resumed.

EFFECT: increased oil recovery of formations and reduced watering of production wells due to increased efficiency of formation coverage, involvement of previously not covered with impact of low-permeable oil-saturated zones of the formation, as well as expansion of technological capabilities of the method.

1 cl, 1 ex, 5 tbl