METHOD FOR HYDROCARBON DEPOSIT DEVELOPMENT Russian patent published in 2007 - IPC E21B43/20 

FIELD: oil and gas production industry, particularly enhanced recovery methods for obtaining hydrocarbons.

SUBSTANCE: method involves injecting water-gas mixture through injection well in reservoir, wherein during filtration process the mixture is separated into gas, water and water-gas mixture; producing the mixture through the first intervals and producing water through the second intervals of production wells to create local thickening of oil-saturated layer; extracting oil plug. Local thickening of oil-saturated layer provides sweep efficiency increase. Product displacement with water-oil mix increased oil displacement efficiency. Water-gas mix separation time is selected to be less than time of reservoir fluid filtration from injection wells to production ones. To change water-gas mix separation time surfactants are added to the mix.

EFFECT: increased oil recovery from thick oil and gas condensate deposits having thin oil rim located under gas and floating on water surface due to simultaneous sweep and displacement efficiency increase.

5 cl, 1 ex, 1 dwg