METHOD FOR HIGHLY-VISCOUS OIL PRODUCTION Russian patent published in 2007 - IPC E21B43/24 

FIELD: oil production, particularly flowing oil production with the use of heat and reagents for lifting and displacing of highly-viscous oil containing large amount of asphalt-tar-paraffin substances.

SUBSTANCE: method involves lowering flow string in casing pipe and lifting oil through annular space. Heat-insulated tube string provided with packer at end thereof, flow string with opened and sealed tube ends are serially lowered in the casing pipe. Heat-insulated tube string is lowered beneath level of paraffin crystallization initiation. Flow string with sealed tube ends are driven up to above level and flow string with opened tube ends are submersed so that space is created between flow strings with opened and sealed tube ends. Heat carrier is supplied in flow string with opened tube ends. Oil is lifted through annular space between heat-insulated and flow string with sealed tube ends. Chemical reagents and heat carrier used for bottomhole formation zone treatment is fed via above annular space. Heat carrier is supplied when well is packed. Space between casing pipe and heat-insulated tube string is filled with gas. Level of crystallization initiation is determined by measuring of temperature along well bore.

EFFECT: increased formation oil influx and oil lifting from well along with retailing oil quality, decreased waste heat and transportation losses.

3 cl, 2 dwg