提高机械采油系统效率的理论研究及应用

Study on improving efficiency of sucker-rod pumping system

提出了将有杆泵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、溶解气膨胀功率 5部分的新观点 ,找出了各部分功率的影响因素 ,并确定了其函数关系。建立了油井在各种不同物性参数、井斜参数、设备参数、生产参数组合条件下所对应输入功率的数学计算公式 ,提出了以能耗最低或以成本最低为原则的确定机采参数的新方法。据此找出的最经济机采参数组合能大幅度提高机采系统效率 ,从而实现经济采油的目标。

The input power of a sucker-rod pumping system 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 determined,and their functional relations were derived.In order to calculate the input power corresponding with different geophysical parameters and liquid properties,different borehole deviations,and parameters of different production and different devices,some mathematical formulas were developed.According to these formulas,a new design method for choosing combination of the production parameters with the parameters of devices was proposed,on the principle of the least energy consumption or the least cost.The new method can be used to determine the most economic combination of parameters for production and devices,and the efficiency of the suck-rod pumping system can be improved greatly.Accordingly,an economical goal for oil production can be achieved.