DOWNHOLE PUMP UNIT FOR PRODUCTION OF BITUMINOUS OIL Russian patent published in 2016 - IPC E21B43/00 F04D13/10 

FIELD: oil and gas industry.

SUBSTANCE: invention can be used in thermal method for extraction of heavy high-viscosity and bituminous oils. Downhole pump unit consists of tubing strings (TS) with packer in its lower part, and rods, run into inclined section of well bore, ground-based drive for rotation of rod string, rotary pump lowered into inclined section of well bore, pipe string at reception of rotary pump. Pipe string is being lowered in well bore horizontal section and equipped with filter at its end, with centering position retainer. Pump comprises set of stages, assembled in cylindrical casing and consisting of impellers and fixed guide vanes. Besides, pump is coaxially connected with output shaft of oil-filled RPM increase booster for rod string containing also inlet and intermediate shafts with gears, and peripheral flow through channels for recovered fluid connecting cavities of rotary pump and tubing string. Wherein spline input shaft of booster gear is made elongated, and on lower end of rod string there is bell with internal splines, forming telescopic pair together with input shaft of booster gear.

EFFECT: higher reliability of rotary pump in inclined part of well bore in thermal methods of action upon productive formation.

1 cl, 3 dwg