ELECTRIC CENTRIFUGAL PUMP SET FOR OIL PRODUCTION AND WATER INJECTION Russian patent published in 2013 - IPC E21B43/40 F04D29/00 

FIELD: oil and gas industry.

SUBSTANCE: set comprises a centrifugal pump with a submerged electric motor, an additional lower pump section with a drive from the submerged motor, a motor hydraulic protection, a packer, a nozzle. The packer disconnects producing and water-absorbing reservoirs. The nozzle connects the lower pump section with the under-packer space and has a plunger at the lower end. The plunger tightly enters the cylinder installed in the packer. The intake of the additional pump section arranged in its upper part is connected with a flat pipe to a well space below the producing reservoir. Blades of impellers of the lower pump section are made for opposite direction of rotation. Impellers are installed on the shaft of the lower pump section in the tilted position. If a water sublayer of the producing reservoir is arranged above the oil one, a dead partition is installed in the lower part of the nozzle. Above the partition there is a hole for water arrival from the well into the nozzle. Below the partition there is a hole made for water arrival into the under-packer space from the upper part of the additional pump section via a flat pipe. In the receiving part of the additional pump section there is a centrifugal separator for separation of oil and its discharge via a side hole in the pump vessel into the well.

EFFECT: invention may be used for dual oil production and water injection in water wells.

1 cl, 4 dwg