INSULATION METHOD OF BRINE WATER INFLUXES IN GAS WELL Russian patent published in 2010 - IPC E21B33/138 C09K8/504 

FIELD: oil and gas industry.

SUBSTANCE: in insulation method of brine water influxes in gas well, which involves pumping of buffer, waterproofing composition containing urethane pre-polymer, hydrocarbon solvent and water to the formation, its flushing to the formation, there used as buffer is gas with relative humidity of not less than 10%, as hydrocarbon solvent - acetone, waterproofing composition - prepared in advance by mixing acetone with water with further introduction to the obtained mixture with water concentration of not more than 8.0% of urethane pre-polymer; the above gas is pumped during 30 minutes at pressure which is higher than formation pressure by 1.5-5 times, and then after it is prepared, pumping of the above waterproofing composition is performed, its flushing with acetone, and then pumping of the above gas during 3 hours.

EFFECT: increasing insulation efficiency of gas wells in conditions of formations with abnormally low formation pressure, and increasing flow rate of the above wells.

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