METHOD FOR WATER INFLUX ISOLATION IN HORIZONTAL PRODUCING WELL BORES Russian patent published in 2006 - IPC E21B43/27 

FIELD: oil industry, particularly for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells.

SUBSTANCE: method involves injecting polymeric solution in well bottom zone; forcing the polymeric solution in well; shutting well down for a time necessary for polymer hardening. The polymer is hydrophobic polymeric plugging composition. Before hydrophobic polymeric plugging composition oil and then water-swellable polymer are injected in well. The water-swellable polymer is mixed with mix liquid, namely with fresh water or clay solution and then the polymer is held in vertical well bore section to provide full mix liquid absorption with the water-swellable polymer. Then the water-swellable polymer is slowly forced in horizontal bore with plugging composition to create preventive filtering layer; displacing plugging composition with oil; drilling hardened plugging composition; injecting acid and diesel fuel or mineralized solution in well to remove filtering layer.

EFFECT: increased efficiency of isolation works along with oil containing interval retention.

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