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.

Scaling, Complexity, and Design Aspects in Computational Fluid Dynamics

“…It is not difficult to confirm that the leading term in Equation ( 7) matches with the simplified expression in (17). Consequently, the viscous shear force acting on the plunger outer surface in the direction from the top to the bottom can be calculated as…”

“…As illustrated in Figure 1, a typical sucker rod pump system includes a moving contact area between the traveling unit (plunger) and a fixed tube (barrel). Further more, a traveling ball valve is attached with the end of the plunger and a standing ball valve is installed with the tube near the oil and gas reservoir where the oil and gas are pushed through the fissure formation [17,18] by the so-called formation pressure. To facilitate the reciprocal motions of sucker rod pump systems, a clearance between 3 to 8 mills (one thousandth of an inch) is often reserved to avoid the direct contact (abrasion) between the plunger and the tube [19,20] and to facilitate the transport of sands and particles in oil and gas mixtures [21,22].…”

Modeling, Kinematic Characteristics Analysis and Experimental Testing of an Elliptical Rotor Scraper Pump

“…Li et al proposed a new type of hydraulic pumping unit. This new pump achieves continuous pumping, improves the pumping rate, and offers remarkable energy-saving performance within a symmetrical structure [18]. Hsieh et al invented a new elliptical curve that can be used as a reference for pump or rotary fluid machinery design [19].…”

Positive Torque Modulation Method and Key Technology of Conventional Beam Pumping Unit

“…The large net torque fluctuation of the crank output shaft and the existence of negative torque are the decisive factors leading to its low efficiency and high energy consumption [8,9]. In response to this problem, many scholars and pumping machine manufacturers both at home and abroad have developed a variety of new energy-saving pumping units [10][11][12] which have achieved certain energysaving effects; however, most of the new pumping units are not yet able to solve the problem of negative torque in the crank output shaft, and the disadvantages of the new energy-saving pumping machines in terms of reliability and maintenance management restrict their development [13][14][15][16][17][18]. On the other hand, the number of beam pumping machines accounts for more than 80% of all pumping units [3,19], and it is impossible to replace all of them in a short time from the perspective of resource utilization and economic cost.…”