METHOD FOR DEVELOPMENT OF MULTILAYER INHOMOGENEOUS OIL DEPOSIT Russian patent published in 2020 - IPC E21B43/14 E21B43/26 E21B43/243 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil industry, in particular, to methods for development of hard-to-recover oil reserves of dense heterogeneous permeability reservoirs. To implement method for development of multilayer heterogeneous oil deposit, drilling of vertical injection wells and production wells is carried out in underlying low-permeable bed and in overlying impermeable kerogen-containing formation. Wellbores are perforated with subsequent hydraulic fracturing of each formation by fluid on hydrocarbon basis with preservation of hydrodynamic isolation of formations. Proppant cracks are pumped into the formed system and an oxygen-containing agent is pumped into the injection well of the impermeable kerogen-containing formation to create an oxidation zone with high temperature. Production well of the obtained product of in-situ transformation of the oxygen-containing agent is performed along the production well, it is subjected to separation from liquid fractions of hydrocarbons and the produced inert gas agent is pumped to the injection well of the low-permeable oil-bearing bed. Oil is lifted through production well from low-permeable bed. Injection and production wells are drilled in impenetrable kerogen-containing formation at distance from each other, not less than radius of zone of complete oxygen consumption at injection of oxygen-containing agent.

EFFECT: providing higher degree of mixability in low-permeable oil formations and displacing inert gas agent consisting of products of in-situ burning of kerogen-containing formations, which causes high degree of oil displacement from low-permeable reservoirs when performing joint development of different permeability beds.

1 cl, 2 dwg