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

FIELD: oil and gas industry, particularly to isolate water influx in producing well bores.

SUBSTANCE: method involves injecting viscous oil with fillers soluble in light oil or in acid in well to create preventive filtering layer; injecting polymer solution into bottomhole formation area; displacing the polymer solution with water; shutting-down well for time necessary for polymer solution hardening. Viscous oil fillers have particle dimensions exceeding dimensions of pores and channels in oil-bearing part of horizontal bore, but are less than channel dimensions at water influx zone. The polymeric composition includes hydrophobic polymeric plugging composition, which is initially displaced with oil and then with water. Then hardened polymeric plugging composition is drilled and acid, light oil, diesel fuel or distillate is injected. In the case of high water influx interval injectivity hydrophobic plugging composition is injected in horizontal bore after preventive filtering layer creation. The hydrophobic plugging composition is based on hydrocarbon fluid mixed with hydrophilic powder material or mixture of hydrophobic plugging composition with hydrophobic polymeric plugging composition is used.

EFFECT: increased efficiency along with retaining of oil output from oil-bearing interval.

2 cl, 1 ex