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建立两层分采同步抽油系统的故障诊断模型 ,研究在实心抽油杆与空心抽油杆的界面处空心泵对应力波的影响 ,给出抽油杆柱不同杆段的波动方程的显示差分格式 ,提出一种故障诊断模型的反问题计算法。用此算法可在缺少一个边界条件的情况下求解故障诊断模型 ,获得抽油系统各个工况下抽油杆柱任意截面的受力状态 ,从而绘制出两层分采同步抽油系统的空心泵示功图和管式泵示功图。将此算法与模式识别技术相结合可对两层分采同步抽油系统的故障进行诊断。
The fault diagnosis model of two-stage sub-synchronous pumping system is established. The influence of the hollow pump on the stress wave at the interface between the solid rod and the hollow rod is studied, and the wave equation of different rods in the rod string is presented. Differential format, an inverse problem calculation method of fault diagnosis model is proposed. With this algorithm, the fault diagnosis model can be solved in the absence of a boundary condition, and the stress state of any cross section of sucker rod column in each working condition of pumping system can be obtained, so as to draw a two-layer hollow pump with synchronous pumping system Kinetics and Tube Pump Kinetics. This algorithm can be combined with pattern recognition technology to diagnose the fault of two-stage sub-synchronous pumping system.