METHOD FOR TREATING DOWN-HOLE ZONE OF INJECTION WELL Russian patent published in 1997 - IPC

FIELD: oil production industry. SUBSTANCE: according to method, injection well is stopped and held closed until restoration of reservoir pressure in down-hole zone of well. Then pumped into injection well is material which levels profile of injectivity, water if pressure-forced and isolation composition is injected. Used as material for levelling profile of injectivity is oil emulsion in amount of 10-25 cu.m per 1 m of productive interval. Used as water for pressure-forcing is brine. After pressure-forcing with brine, technological delay is initiated during 1 - 2 days. Isolating composition is injected in amount of 5-10 cu.m per 1 m of productive interval under pressure which is 30-40% higher than oil emulsion injection pressure. Technological delay is kept during 1-2 days. EFFECT: high efficiency.