Abstract: In order to reduce the energy consumption and improve the efficiency of pumping system, a theoretical model for calculating the input power of sucker-rod pumping system was established. In the model, the input power was divided into hydraulic horsepower, surface mechanical loss power, down-hole viscous friction loss power, down-hole sliding friction loss power and solution gas expanding power.The influencing factors for each power were analyzed. The functional relations of the input power with reservoir petrophysical parameters, liquid properties, borehole deviations, and parameters of production and devices were determined. According to the theoretical model for calculating the input power, a new method for designing a sucker-rod pumping system with the least energy consumption or the least cost was proposed. The most economical combination of parameters for oil production and devices can be obtained with the new method. Application of the new method in oilfields showed that the new design method could effectively cut down the energy consumption and greatly improve the efficiency of suck-rod pumping systems.

Key words: sucker rod pumping system, input power, mechanical production parameters, optimization design, oil production efficiency, oil production cost

摘要： 为了有效地降低有杆泵抽油系统能耗及提高抽油机井系统效率,建立了一套有杆泵抽油系统输入功率理论计算体系。该体系将有杆抽油系统输入功率划分为有效功率、地面损失功率、井下粘滞损失功率、井下滑动损失功率及溶解气膨胀功率5部分。分析了各部分功率的影响因素,确定了抽油系统输入功率与物性参数、井斜参数、设备参数及生产参数组合间的函数关系式。根据新的输入功率计算体系,提出了以能耗最低或以成本最低为目标函数的机采系统设计方法。运用该方法进行机采参数优化,能够确定最经济机采参数组合。现场应用表明,该方法可以有效降低抽油机井系统能耗,大幅度提高机采系统效率。

关键词: 有杆泵抽油系统, 输入功率, 机采参数, 优化设计, 采油效率, 采油成本