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

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