METHOD OF BLOCKING WATER-PRODUCING FORMATIONS

摘要

FIELD: oil-and-gas industry. ^ SUBSTANCE: proposed method comprises cyclic pumping blocking composition into formation. Said composition is base on liquid-phase polymer solution in fluid not causing swelling. Then pumping is interrupted. At the beginning of every cycle, water is slugged in amount of 5 to 20% of the blocking composition volume, composition is pumped at pressure 1.1 to 2.1 times higher that formation pressure. At the end of every cycle, pressure is reduced to formation pressure and soaking is carried out for period equal to preset blocking composition gellation time in formation conditions. ^ EFFECT: higher efficiency of formation absorption isolation in both terrigenous and carbonate reservoirs and leveling injection capacity. ^ 2 tbl