FIELD: oil and gas industry.
SUBSTANCE: isolation method of water influx zones in a well consists in pumping to an isolated formation of water solution of calcium chloride with density of not less than 1500 kg/m3, which is warmed up to the temperature of 70-90°C. After pumping of water solution of calcium chloride exposure is performed during 8-12 h. Then, a bank of hydrocarbon liquid and liquid sodium glass heated to the temperature of 70-90°C is pumped in series and exposure is performed during 24-48 h for formation of gel in the whole volume of liquid sodium glass.
EFFECT: improving isolation efficiency of water influx zones in a well owing to creating a stronger waterproof screen by forming a gel in the whole volume of liquid sodium glass pumped to the formation, through which a well is flooded.
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