Currently the most commonly used species are pumping beam pumping unit , tower type pumping unit and screw pumping unit three, including screw pumping unit is developing rapidly in recent years , is a suitable for high viscosity, high sand , high GOR crude oil extraction machinery equipment , screw pumping unit as a simple , efficient and seed oil press of artificial lift methods in heavy oil and oil sand mining in aqueous has been widely used.
Screw pump system is divided into ground -driven and driven underground , where the ground direct-drive screw downhole using ordinary pump, driven at the wellhead , oil processing, mature technology, the current domestic oilfields such a screw driver to use more way . Ground direct-drive permanent-magnet synchronous motor drive screw with Delta C2000 high magnetic flux vector -purpose inverter , inverter shutdown using an external braking resistor two , the entire system is simple and compact , reliable operation , to achieve a good energy saving effect.