机采系统效率计算方法研究与认识

STUDY AND ANALYSIS ON THE CALCULATION METHOD OF THE EFFICIENCY OF ARTIFICIAL LIFT

从能量供给与消耗的角度分析并定义了有杆抽油能量系统。在能量供给方面,除了考虑电机输入能量,还考虑了地层输入能量,尤其是可用于液体举升的气体膨胀功率。当考虑气体膨胀功率时,所计算的有杆抽油系统效率值小于按标准SY/T6 12 6—1995所计算的值。按照现行方法计算系统效率,通常情况下地面效率大于地下效率,亦即在整个有杆抽油能量消耗比例中地下值大于地面值。地下能耗中,粘滞损失功率及泵损失功率所占比例较大。从能量供给与消耗的角度分析与认识机采系统效率。

The energy system of artificial lift is analyzed and defined from the view of energy supply and energy loss. In energy supply, not only the energy input of electric machine but also the formation input energy is studied in this paper. Especially, the gas expansion power which is used for liquid artificial lift is also considered. When we calculated the gas expansion power, the value of artificial lift efficiency will be less than the value calculation according to the standard SY/T6126-1995. Generally, when the surface efficiency is lower than dowmhole efficiency, the underground value is bigger than the surface in whole proportion of energy loss. The loss power on flowing resistance and sucker pump accounts for the most proportion in the energy loss of underground. It is helpful to improve the artificial lift efficiency and to deepen the research if we study the efficiency from the energy supply and energy loss.