METHOD OF PRODUCING OIL IN POROUS FRACTURED RESERVOIRS REDUCING WELL PRODUCT WATER CONTENT Russian patent published in 2012 - IPC E21B43/22 E21B43/32 

FIELD: oil and gas production.

SUBSTANCE: proposed method comprises injecting displacement agent via injection wells and oil extraction via production well to water influx into well products making operation inefficient, injecting water-shutoff agent containing water-swellable particles with initial size smaller than flooded fracture follow section, conserving the well for composition structurisation period, developing and commissioning the wells. Grit from rubber-based elastomer resulted from crushing rubber 'AQUASTOP' channel or polymer grit resulted from crushing sealing gasket 'PLUG' are fed into fluid to be injected into production and injection wells, grit initial grain size being smaller than flooded fracture flow section but exceeding than of pores of oil-saturated block of bed. Said grit swells in water by, at least, 300% in 24 hours to concentration of 3-40 wt % in working fluid based on water thickened by polymer and bearing viscosity killer to release injection water. Said fluid is forced into bed by sweet water.

EFFECT: reduced water content, higher cementing properties of water-shutoff additive.

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