METHOD FOR DEVELOPMENT OF MULTILAYER HETEROGENOUS 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 develop a multi-layer non-uniform oil deposit, drilling of horizontal injection wells and production wells is performed, which are parallel to each other along strike of beds, respectively, in overlying impenetrable kerogen-containing formation and in underlying low-permeable bed. Wellbores are perforated with subsequent hydraulic rupture of each formation with a hydrocarbon-based fluid to form systems of cracks connected to a single man-caused header. Pumping is carried out into the formed system of proppant cracks and supplied to the pressure well of an impermeable kerogen-containing formation of an oxygen-containing agent with creation in it of an oxidation zone with high temperature and formation of a displacement agent in the zone of in-situ combustion in the form of a product of in-situ transformation of the oxygen-containing agent with provision of its vertical filtration into the underlying low-permeable formation. Oil is lifted at wellhead at production well from low-permeable bed. Drilling of a horizontal loading well in an impermeable kerogen-containing formation is carried out at a distance from the roof of the low-permeable formation, which is not less than the radius of the zone of complete oxygen consumption when injecting an oxygen-containing agent.

EFFECT: high degree of displacement of oil from low-permeable reservoirs when performing combined development of different permeability of formations due to higher degree of solubility in low-permeable formations of oil and displacing inert gas agent consisting of products of in-situ burning of impermeable kerogen-containing formations.

1 cl, 2 dwg