Fig 1.
Motor driven rod pumping unit construction.
Fig 2.
Physical structure of rod pumping unit.
Fig 3.
Schematic diagram of converting DCs into motor power curve.
Fig 4.
Automatic adjustment of input data by electrical reference production model.
Fig 5.
Structural diagram of N-HiTS prediction model.
Fig 6.
Contrast of N-HiTS and N-BEATS blocks.
Fig 7.
Local predictions are combined into global predictions.
Fig 8.
(A) Structure of rod pumping unit. (B) Drive motor and gearbox.
Fig 9.
Drive motor and parameter sensor.
(A) Drive motor. (B) Sensors installed in the distribution box.
Table 1.
Parameters for driving the motor.
Fig 10.
DC and converting the resulting electrical power curve.
(A) Normal. (B) Insufficient fluid supply. (C) Gas influence. (D) Leakage from the pump.
Fig 11.
Statistical results of measured motor power data in one day.
Fig 12.
Electric power time series prediction results after sampling.
Fig 13.
Motor power time series predicted by different forecasting methods.
Table 2.
Evaluation of prediction results of actual motor power parameters.
Fig 14.
A combination of three lengths of motor power time series.
Fig 15.
Experimental results with a predicted length of one period.
(A) The motor power sequence length is 8 days. (B) The motor power sequence length is 12 days. (C) The motor power sequence length is 16 days.
Fig 16.
Comparison of model prediction results.
(A) An 8-day evaluation index of prediction results. (B) An 12-day evaluation index of prediction results. (C) An 16-day evaluation index of prediction results. (D) The N-HiTS model compared with the predictions of other models.
Table 3.
A three-length sequence of parameters is used to predict the time spent in seconds.
Fig 17.
Multi-period forecast results.
Fig 18.
Evaluation of Multi-period prediction results.
(A) An evaluation index with a prediction length of 2 days. (B) An evaluation index with a prediction length of 3 days.
Fig 19.
Prediction of composite fault states.
(A) Prediction of the composite state of gas influence and overbalance. (B) Prediction of the composite state of traveling valve leakage and underbalanced.
Fig 20.
The ratio of smaller peak to larger peak in the prediction experiment.