METHOD OF INCREASING OIL RECOVERY Russian patent published in 1998 - IPC

FIELD: oil-producing industry; applicable for increasing oil recovery from producing formations in oil production by the method of replacement. SUBSTANCE: to increase oil recovery, placed on the bottom of injection well is hydrodynamic radiator of elastic vibrations. Injected into well is water (without activators and special heating) required for replacement of oil in producing formation and maintenance of pressure. One part of water flow energy when passing the hydrodynamic radiator, is converted in elastic vibrations within frequency range from 1 to 45 kHz which act on oil reservoir. In so doing, decolmatation takes place in bottom-hole zone of injection well to free capillary-replaced oil and to disturb the dynamic equilibrium on water-oil interface that leads to straightening front of oil replacement with water and to increase oil recovery from producing formation by 10-90%. In this event, treatment of producing formation is carried out without shut-in of well operation, ceasing of oil production, and during the entire term of well operation; and energy of action on producing formation and, consequently, oil recovery are increased with the help of installation of hydrodynamic radiator in all injection wells. EFFECT: higher oil recovery. 2 cl