By this method, when the surface dynamometercard is known, the dynagraph at the pump can be accurately determined;
用这种方法，在地面示功图已知时，可以精确地确定井下泵的示功图；
2
The identification of down-hole dynamometercard is the key to making the diagnosis expert system for pumping with rod.
井下示功图的自动识别是建造有杆抽油工况诊断专家系统的一个技术关键。
3
The results show that the predicting surface dynamometercard is consistent with the measured card and can be used to analyze the data of pumping Wells.