The concept of a Venturi Effect Jet Pump involves injecting pressurised fluid down the power fluid flow path. Once the pressurised fluid reaches the Jet Pump, the flow path area is decreased through a nozzle, and this increases the velocity of the fluid creating a Venturi Effect.
The pressure created from the Venturi Effect draws reservoir fluid into the Jet Pump. The power fluid and reservoir fluids mix and the pressure increases as the velocity drops through the flow path of the larger area. The pressure increase is sufficient to lift the fluids to surface.