METHOD FOR TREATING DOWN-HOLE ZONE OF PRODUCING WELL Russian patent published in 1998 - IPC

FIELD: oil production industry. SUBSTANCE: this is aimed at increasing oil recovering efficiency. According to method, determined in producing well are zones of oil and water inflow, and evaluated is injectivity of these zones. According to relation of injectivity of zones, determined is ratio of speeds of injecting unmixable working agents through pump-compressor pipes and annular space. Dividing boundary of working agents is maintained between zones of oil and water inflow. Simultaneously injected into oil inflow zone is oil or its products, and into water inflow zone injected is alkali gel formation agent based on sodium silicate. Technological delay is undertaken in well. Then, injected into well are acid-containing agent, hydrocarbon solution of water-repellent solution, pressure-forced liquid. Secondary technological delay is undertaken. In result, oil recovery is increased, and amount of water in well product is reduced. EFFECT: high efficiency.