RECOVERY METHOD OF HIGH-VISCOSITY OIL DEPOSIT BY STEAM CYCLIC EFFECT Russian patent published in 2017 - IPC E21B43/24 E21B7/04 E21B47/06 

FIELD: oil and gas industry.

SUBSTANCE: in the recovery method of the high-viscosity oil deposit by the steam cyclic action, drill the horizontal well in the lower quarter of the oil-filled formation thickness, the fracturing pressure in the carbonate rocks is determined by conducting the testing injection, and in the terrigenous rocks by the reservoir mini hydraulic fracturing. Then at the wellhead, the pipe string is equipped from the bottom up: with the screen liner, the pump, the relief valve, bypassing from the pipe string to the in shell space, the expanding packer, after that the pipe string is lowered into the well so, that the expanding packer is placed opposite the roof of the reservoir with high viscosity oil. The expanding packer is set in the well, then at the wellhead the discharge line for the coolant injection is tied to the mixer, the steam generator and the pump unit. The two-component mixture is used as the coolant, it consists of the steam with the temperature of 200-220°C, with addition of the light hydrocarbon at the rate of 1l of light hydrocarbon per 5 kg of steam, provide the steam cyclic action by the two-component mixture, prepared at the wellhead to the reservoir with high-viscosity oil for 15 days with the open relief valve, then the process is held for 7 days for impregnation with the closed relief valve, then the preheated oil is selected up to the production decline up to the cost effective value for the given well, after that the cycles are repeated.

EFFECT: increase of the efficiency and quality of steam-thermal effect on the reservoir with high-viscosity oil, reservoir properties keeping, reduction of the heat losses during the method implementation.

3 dwg, 2 tbl