... coefficient (R) of 0.93. In addition, the new model outperformed three existing ROP models. The novelty in this paper is the application of the clustering technique in which the formations are clustered based on their compressive strength range to predict the ROP. Clustering yielded accurate ROP prediction...

... . 7143 , 0 . 6111 , 0 . 4889 } Clustering techniques gather features vectors with similar characteristics into clusters. K -means is one of the clustering methods with advantages of quick calculation and stable convergence. The number of cluster needs to be set first. Then, cluster...