Table 1.
Selection parameters for block system efficiency research.
Table 2.
Statistical value of 16 indicators in the block.
Fig 1.
Improved k-means algorithm flow chart.
Fig 2.
Selection of the best k value.
Fig 3.
Comparison of system efficiency ratios (a) k = 2, (b) k = 3, (c) k = 4 and (d) raw data.
Fig 4.
Correlation of feature parameters: (a) correlation between factors; (b) Correlation between various factors and system efficiency.
Fig 5.
Histogram of the weight of each factor.
Fig 6.
Initial cluster centre determination: (a) ε value determination; (b) Initial cluster centre plot.
Fig 7.
Comparison of the results of the improved algorithm and k-means algorithm: (a) improved algorithm; (b) k-means algorithm (first test); (c) k-means algorithm (second test); (d) k-means algorithm (third test).
Table 3.
Comparison of within-group error sum of squares.
Table 4.
Distance between groups.
Fig 8.
k-means clustering results.
Fig 9.
Block motor parameters for the improved algorithm clustering analysis.
Fig 10.
Block downhole parameters of the improved algorithm cluster analysis.
Fig 11.
Block operating parameters of the improved algorithm clustering analysis.