METHOD FOR DEVELOPMENT OF FLOODED OIL RESERVOIR WITH NON-UNIFORM PERMEABILITY Russian patent published in 2020 - IPC E21B43/22 C09K8/68 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to development of oil deposits and can be used in development of oil deposit with non-uniform permeability water-flooded terrigenous and fractured carbonate oil formations to control injection capacity profile of injection well and to limit water influx in production well by balancing permeable formation inhomogeneity. In the method for developing a non-uniform permeability of a flooded oil formation, involving pumping into the formation a gel-forming composition – a dispersion in water of polyacrylamide, guar, chromium acetate and metal oxide, before pumping gel-forming composition into formation is determined allowable injection pressure and injection capacity of well, dispersion further contains wood flour, and as metal oxide contains zinc oxide, with following ratio of components, wt. %: polyacrylamide 0.6–0.8, guar 0.1–0.2, chromium acetate 0.04–0.08, zinc oxide 0.04–0.06, wood flour 0.01–0.2, water – balance, when the injection capacity of well is less than 250 m³/day, wood flour is pumped 0.01–0.05 wt. %; with well injection capacity 250–400 m³/day, wood flour is pumped 0.05–0.1 wt. %; when the well injection capacity is more than 400 m³/day, wood flour is pumped 0.1–0.2 wt. %.

EFFECT: higher efficiency of oil recovery due to limitation of water influx to well by creation of increased filtration resistance by injection of reinforced gel-forming composition and expansion of technological capabilities of the method.

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