FIELD: oil production industry, particularly for cementing casings into boreholes.
SUBSTANCE: method involves performing geophysical investigations; perforating well; injecting sealing composition to create gas-tight screen in gas-bearing bed. In accordance with the invention gas-tight screen is multilayered and has radius of 15 m or more. To create the screen water, aqueous solution of water-shutoff agent and cement grout are alternately injected in gas-bearing bed. Water is fed under pressure of more than 7 MPa and less than hydraulic fracture pressure in amount of more or equal to 100 m3 per 1m thickness of the bed. Aqueous solution of water-shutoff agent is heated up to 30-50°C and is injected in amount equal or more than 3 m3. Cement grout is supplied in amount of not less than 0.5 m3.
EFFECT: increased isolation of gas-bearing bed and gas flow liquidation in behind-the-casing zone.
4 ex
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