METHOD FOR INCREASING EFFICIENCY OF ENHANCED OIL RECOVERY (EOR) METHODS Russian patent published in 2024 - IPC E21B43/16 E21B33/138 

FIELD: oil and gas industry.

SUBSTANCE: invention can be used to improve the technological efficiency of enhanced oil recovery (EOR) methods. A method has been declared for increasing the efficiency of enhanced oil recovery (EOR) methods, including determining the injectivity of an injection well, the permissible pressure on the production casing and formations, calculating the volume of injection of the working agent, determining the injection modes of the working agent, pumping gel-forming compositions and the working agent into the formation through the injection well, oil withdrawal through production wells. At the same time, a complex of hydrodynamic and geophysical studies is carried out. Residual oil reserves are determined in the area of the marginal injection well. Production wells are identified that are hydrodynamically connected to the marginal injection well, with a ratio of marginal injection well to production wells of at least 1:2. At marginal injection wells, the perforation is closed by installing a cement bridge, and directed perforation is performed towards the OWC contour into the area of non-target injection. Next, gel-forming compositions are pumped, using the technology of levelling the injectivity profile, into the area of non-target injection of the marginal injection well in a volume of at least 15 m³ per 1 m of formation thickness, after which the perforation is closed for the second time by installing a cement bridge. Directed perforation is performed towards the target central zone of the reservoir in the target injection area. Next, the working agent injection volumes are calculated, equal in value to 1.5% of the pore volume of the impact area, the working agent injection modes are determined, equal in value to 0.63% of the pore volume of the impact area per month, and the working agent is injected into the target injection area of marginal injection wells.

EFFECT: increased oil recovery.

1 cl, 1 dwg