METHOD OF OIL RECOVERY FROM FORMATION Russian patent published in 2002 - IPC

FIELD: oil producing industry, particularly, method of oil recovery from nonuniform reservoirs. SUBSTANCE: method includes oil withdrawal through producing well, injection of displacing agent through injection well and seismic action on formation from producing and injection wells. Prior to injection of displacing agent, preliminarily determined are dominant frequency of seismic signals to which minimum attenuation of waves propagating from injection to producing wells and back is registered. Generators of seismic vibrations tuned to registered dominant frequencies are run into wells. Displacing agent injected into injection well is used in form of foam system with gradual variation of gas fraction from minimum to maximum concentration with preset limits. Foam system is injected simultaneously with seismic action on formation at registered dominant frequencies. EFFECT: higher oil recovery from formation and reduced water encroachment at late stage of deposit development. 2 cl