Downhole Fault Prediction Method of Rod Pumped Oil Well Based on Multivariable Gray Model

Abstract

A downhole fault prediction method for rod pumped oil wells based on a multivariable gray model. The ground dynamometer diagram is collected by the dynamometer remote data acquisition system; the surface dynamometer diagram is converted into a downhole pump dynamometer diagram; Characterize the curve moment eigenvector of the graphic features of the downhole pump power map; predict each eigenvector by the multivariate gray model; calculate the gray correlation degree between the predicted sample and each fault type in the standard set, and the fault corresponding to the maximum gray correlation degree Type is the failure type of the predicted sample. It can reasonably adjust the working system of the pumping well, thereby improving the production efficiency of the pumping well, and can realize the fault prediction of the downhole working condition of the rod pump pumping well; the calculation is simple, the required samples are few, and it is suitable for any distributed data set ; The prediction accuracy is high, especially for gradual fault types.

Description

technical field [0001] The invention belongs to the field of fault prediction methods for rod pumped oil wells, and in particular relates to a downhole fault prediction method for rod pumped oil wells based on a multivariable gray model. Background technique [0002] The failure of rod pump wells is a major problem faced by oil field production, which will affect the operation status of downhole pumps and the oil production of oil wells. Since the oil well pump works thousands of meters underground, the working conditions are very complicated, the working environment is extremely harsh, and the failure rate is very high, which will greatly affect the normal production of the oil field. Once the pumping well breaks down and cannot be diagnosed in time, it will cause waste of energy, affect the production of the pumping well, and bring losses to the enterprise. At present, many studies have focused on the downhole fault diagnosis methods of pumped rod pumping wells, but this ...

AI Technical Summary

Problems solved by technology

Since the oil well pump works thousands of meters underground, the working conditions are very complicated, the working environment is extremely harsh, and the failure rate is high, which will greatly affect the normal production of the oil field

Once the pumping well fails and cannot be diagnosed in time, it will cause waste of energy, affect the production of the pumping well, and bring losses to the enterprise

At present, many studies have focused on the downhole fault diagnosis method of the rod pump pumping well, but this is based on the fact that the fault has already occurred, which has already brought a certain impact on the normal production of the pumping well.

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