“…Therefore, based on mechanism analysis in a sucker-rod pumping system, Zheng et al [ 28 ] drew out seven key parameters, such as the moisture content, gas-liquid ratio, sucker-rod specifications, stroke, speed, pump diameter, and working condition, and identified the working condition using a hidden Markov model. Zhang et al [ 7 ] selected feature data, such as dynamometer cards, power, liquid-producing capacity, dynamic fluid level. Liu et al [ 8 ] extracted the key parameters, such as dynamometer cards, liquid-producing capacity, work day time.…”