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为合理选择单螺杆泵，将螺杆泵抽油井作为一个大的生产系统，把油层、套管、油管、井下螺杆泵机组和井口作为5个子系统，利用系统节点分析法，确定出泵的工作载荷，并根据油井的实际工作参数，对泵特性曲线进行换算。由油井工作参数和单螺杆泵输油特性曲线对比可知，单螺杆泵的特性曲线和油井工作参数配合最好的情况是：油井的工作点应位于泵特性曲线Q0-H0的下面，而且在高效区的开始处。实践证明，采用这种方法选泵，既能保证油井的产量，又能明显地提高单螺杆泵整套装置的效率，还能延长泵的使用寿命。
In order to select a single screw pump rationally, a screw pump pumping well is taken as a large production system. The oil layer, casing, tubing, downhole screw pump unit and wellhead are taken as five subsystems, and the system node analysis method is used to determine the working load of the pump , And according to the actual working parameters of the well, the pump characteristic curve conversion. Comparing the working parameters of oil well with those of single screw pump, it can be seen that the characteristic curve of single screw pump cooperates well with the working parameters of oil well: the working point of oil well should be below the pump characteristic curve Q0-H0, The beginning of the district. Practice has proved that using this method to choose the pump, both to ensure the production of wells, but also significantly improve the efficiency of the whole set of single screw pump device, but also to extend pump life.