METHOD FOR TREATMENT OF WATERED DOWN-HOLE ZONE OF PRODUCING WELL Russian patent published in 1997 - IPC

FIELD: oil production industry. SUBSTANCE: according to method, injected into down-hole zone is solution of surface-active material, determined are source of watering and watered interlayer. Stopped are injection wells communicating with producing well being treated through watered interlayer. Technological delay is initiated to reduce bed pressure in watered interlayer. Watered interlayer is isolated with technological delay. Zone of perforation is filled with stimulating liquid based on salt water solution including 0.1-1% of surface-active material and 0.01-0.15 of polyacrylamide. Mass of stimulating liquid is subjected to pulsing pressure until injectivity of well reaches at least 70% of injectivity of nearest injection wells. Solution of surface-active material is injected. After injecting solution of surfacer-active material initiated is start of inflow with depression on bed during first 10 days to be less than 4 MPa with subsequent increase to 6 MPa. This increases oil output. EFFECT: high efficiency.