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Hydraulic part to pumps of VNO type is intended to pump stratal liquid by pumping units with upper drive out of the oil wells with internal diameter of the casing not less than 121,7 mm as per GOST 633—80.
The stratal liquid — mixture of oil, associated water and oil-well gas has the following parameters:
Hydraulic part of the pumps of VNO type is a part of the submersible unit for oil recovery. The said unit - is a submersible unit with electric equipment (control station and electric drive), located on the surface.
The hydraulic part consisting of screw-shell pair is lowered separately into the shell: firstly the shell is lowered on the oil well tubing by which the stratal liquid is drived up, then the screw is let down on the rods.
Advantages of semi-submersible screw pumps applied for oil production:
In comparison with SHGN plunger pumps:
In comparison with UEVN submersible screw pumps:
In comparison with ETSN submersible centrifugal pumps
|Flow (nomin.), m³/day||25|
|Pump power input (nomin.), kW||6|
|Rotation speed, rpm||230|
|Kinematic viscosity of pumped liquid (calculated), ° VU||3|
For example VNOМ 20.15 , where :
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