Model of a Screw Pumping Station for Alternating Reservoir Operation

A mathematical model has been developed for separate alternate (dual) operation of two reservoirs by a screw pump equipped with an electric valve for switching between inputs. The model is based on the balance equations for the liquid volumes flowing from the reservoir into the borehole, moved by the pump, and accumulating in the borehole. The variation in downhole pressure, liquid flow from the reservoirs, and pump delivery in pumping and accumulation conditions for the upper and lower reservoirs is analyzed for different speeds of the screw pump. The model may be used to assess the lengths of the cycles for the upper and lower reservoirs in the design of pump operation in separate alternate operation.