PROCEDURE FOR DEVELOPMENT OF DEPOSIT WITH HIGH VISCOUS OIL Russian patent published in 2011 - IPC E21B43/24 

FIELD: oil and gas production.

SUBSTANCE: procedure consists in construction of vertical pressure and producing wells in one network, in pumping steam into reservoir through pressure wells and in withdrawing oil through producing wells. The pressure wells are arranged between producing wells and are perforated above zone of producing wells perforation. The perforation zone of the producing wells is located in a lower quarter of the producing reservoir, while that one of the pressure wells is located in an upper half. Pipe strings are lowered into the pressure wells for pumping superheated fluid into the reservoir; each pipe string is equipped with a jet pump from beneath; the jet pump is installed below perforation zones; a packer is installed in each well above perforation zones. Superheated fluid is pumped via the pipe string under pressure exceeding pressure of steam generation; before pumping superheated fluid is heated to temperature exceeding temperature of steam generation at reservoir pressure. Upon generation of a steam chamber in the reservoir a solvent is periodically added into superheated fluid; amount and volume of solvent is controlled by viscosity of reservoir product extracted from the producing wells. Upon production of reservoir flooding superheated fluid pumping into the reservoir is stopped in one of the sections; reservoir product is withdrawn and cooled to minimum temperature ensuring viscosity of high viscous oil. Further reservoir product is withdrawn from periphery of this region. Superheated fluid pumping into the reservoir and withdrawal of reservoir product are resumed under a cyclic mode with stops when production is flooded at a certain section of the reservoir.

EFFECT: increased degree of withdrawal of deposits of high viscous oil, control of oil intake at sections with flooded product of well.

1 ex, 2 dwg