The r2 value is 071 094 096 and 096 for the 20000 lb

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Unformatted text preview: ata and the DSE model is observed. The R2 value is 0.71, 0.94, 0.96 and 0.96 for the 20,000 lb, 30,000 lb, 40,000 lb and 50,000 lb, respectively. All the curves have a similar pattern showing three main regions: (1) High DSE and low ROP: inefficient drilling, on the left side of the plot; (2) Low DSE and high ROP: efficient drilling, on the right side of the plot; (3) A transition zone from region 1 to region 2 in between these two regions. DSE vs. ROP, for different HSI: Fig. 3 shows DSE vs. ROP again, but this time the data is grouped according to the HSI. The WOB curves are kept on the plot to make a connection with Fig. 2. Fig. 3 shows that all the data with HSI between 0.5 hp/in2 and 1.7 hp/in2 are located on the inefficient drilling region (Region 1: high DSE and low ROP) for their particular WOB. All the data with HSI between 5.8 hp/in2 and 7.9 hp/in2 are on the efficient drilling region (Region 2: low DSE and high ROP). The data with HSI between 1.8 hp/in2 and 5.7 hp/in2 are in the transitio...
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