FIELD: oil and gas industry.
SUBSTANCE: water inflow shutoff method in fractured carbonate reservoirs includes preparation and injection to the isolation zone of water shutoff composition consisting of aqueous solutions of polyacrylamide and polyaluminium chloride. At that water shutoff composition contains additionally construction micro-reinforcement fibre BCM. In what connection BCM suspension is prepared preliminary with length of 3-18 mm in quantity of 2-5 kg per 1 m3 of 0.05-0.2% aqueous solution of polyacrylamide. Thereafter the prepared suspension is injected to the isolation zone in sequence with 10-15% aqueous solution of polyaluminium chloride with pH = 3.5-5 and ratio of 1:3 respectively.
EFFECT: improved efficiency in water inflow shutoff due to formation of gel directly in the isolation zone and increased resistivity of the isolating gel to pressure drops in conditions of fractured carbonate reservoirs.
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