METHOD FOR DEVELOPMENT OF STRUCTURAL OIL DEPOSIT Russian patent published in 2019 - IPC E21B43/20 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil industry and can be used in development of structural oil deposits with several productive interlayers. Provides for increased oil recovery of structural oil deposit. Method includes selection of deposit, productive formation of which is represented by several interlayers, drilling of deposit by wells along grid, production of oil from production wells, pumping of working agent into injection wells, transfer of production wells to injection wells at watering of production wells to 98 %. According to the invention, according to the invention, uplifting is first seismic, having circumferential shape, from the central well, lifting is lifted along a triangular or square grid and a deposit is formed, in the production wells, all oil-saturated interlayers are re-opened in oil and water-oil zones, and in injection wells – in purely water-bearing zone, after drilling, rows A_n are formally formed from central production wells from drilled wells, where n is row number, for central production well n=1, wherein both for triangular and square grids rows are selected in form of circles with radius L_n from central well, each circle passes through at least four wells, in all wells in each interlayer, perforation density is inversely proportional to interlayers permeability, or in production wells inflow control devices are installed, production wells are put into operation, wherein bottomhole pressure is maintained in each row A_n at level P_n=P_min+(P_max-P_min)·(L_n/ΣL), where P_min – minimum bottom-hole pressure characteristic for central well, P_max – maximum bottom-hole pressure characteristic for the last row of production wells located at distance ΣL from central well, at reduction of formation pressure in zone of extraction of production well to pressure of oil saturation with oil it is transferred under pumping of working agent.

EFFECT: technical result consists in improvement of oil recovery of structural oil deposit.

1 cl, 1 dwg