Diagnose for downhole working conditions of the beam pumping unit based on 16-directions chain codes and K-means clustering method

摘要

The dynamometer card is a main method to analyze downhole working conditions of the beam pumping unit in actual operation. For computer based diagnosis mode, a method based on 16-directions chain codes and K-means clustering is proposed in this paper. First, the 16-directions chain codes are used to recreate boundary contour curve of the dynamometer card; then seven feature vectors which can accurately describe regional characteristics of the curve are extracted; and finally, K-means clustering algorithm is used to determine the fault type. Simulation experiments verify that the proposed method has better effectiveness both in diagnosis accuracy and computation time.