Design and analysis for a new energy-saving hydraulic pumping unit

Abstract

With the increasing concern over global energy crisis, energy saving in pumping units is becoming a significant subject. In terms of energy-saving and working efficiency, hydraulic pumping units outperform conventional pumping units. In this paper, a novel hydraulic pumping unit is proposed to overcome the existing drawbacks of conventional pumping units and present hydraulic pumping units. Firstly, this novel hydraulic pumping unit adopts a balanced mechanical structure, which means two oil wells are used in this system and the weight of their sucker rods can balance each other through the symmetrical arrangement. This kind of structural design not only saves the nominal power but also allows the system to continuously pump oil. Another feature of this hydraulic pumping unit is that it adopts the electro-hydraulic proportional load-sensing control technology, which makes the pressure and flow rate of the pump adapt to the requirement automatically in real time. The double wells of the system work alternatively under the normal condition and any one can work alone when the other needs maintenance, which improves the operating rate of pumping oil. After the main system parameters are calculated, conclusion can be drawn that both the nominal and operating power of this hydraulic pumping unit are relatively low. The model of the whole system is built based on mathematical dynamics and AMESim environment, and simulation results demonstrate that the proposed hydraulic pumping unit can achieve remarkable energy-saving performance.