ENHANCED OIL RECOVERY METHOD Russian patent published in 2019 - IPC E21B43/32 

FIELD: oil industry.

SUBSTANCE: invention relates to development of oil and gas condensate deposits and can be used in geology, mining and oil and gas industry. In the method of increasing oil recovery, forming a hydrodynamic screen separating the oil-saturated from the gas-saturated zone of the formation by pumping into the formation a screening reagent, wherein said reagent used is a water-based liquid having viscosity of 20 to 39 MPa⋅s and from 101 to 160 MPa⋅c. Before pumping to the formation, selection of possible reagents of screen formation for a specific deposit is performed, for this purpose the strength properties of the hydrodynamic screen are experimentally determined by determining the gas breakthrough pressure through the hydrodynamic screen and determining the residual resistance factor of the hydrodynamic screen. Determination of strength properties of screen is carried out on physical model of reservoir filled with core material of specific deposit. Natural gas and oil are pumped into the physical model of the formation, after which each of the possible reagents of the screen formation is pumped in turns with flow rate in volume of 20–40 % of the pore volume of the physical model of the formation. Hydrodynamic shield formation reagent is selected from the experimental hydrodynamic screen and the residual resistance factor of the experimental hydrodynamic screen by the maximum values of gas breakthrough pressure.

EFFECT: invention provides increasing oil recovery of formations by forming a hydrodynamic shield separating oil-saturated from gas-saturated zone of formation with respect to successive partially combined development of oil and gas condensate zones of oil and gas condensate deposits.

1 cl, 5 dwg, 1 tbl