METHOD FOR DEVELOPMENT OF A ZONAL-HETEROGENEOUS OIL RESERVOIR Russian patent published in 2021 - IPC E21B43/26 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil and gas industry and can be used to develop a zonal heterogeneous oil reservoir, in particular to involve in the development of low-permeability zones of the reservoir. The method includes opening an oil reservoir with a vertical well, drilling a sidetrack with an entrance at a distance from the main vertical wellbore, excluding their hydrodynamic connection, initiating the formation of cracks through the sidetrack into the reservoir, pumping a displacing agent and producing reservoir products. In this case, vertical boreholes are drilled along any of the known reservoir penetration grids with a division into injection wells for pumping a displacing agent and production wells for production, determine low-permeability zones of a reservoir with a permeability at least two times less than the average permeability of the reservoir. Sidetracking is carried out into low-permeability zones from nearby wells, in which the formation of cracks in the exposed zones is initiated by thermobarochemical and/or acoustic-seismic action with equalization of permeability to the average permeability of the reservoir and isolation of the sidetrack.

EFFECT: proposed method makes it possible to level the permeability of a low-permeability zone with an average permeability of the reservoir to level the displacement front and increase the drainage of oil and, as a consequence, increase the oil recovery factor of the reservoir.

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