The data on the inefficient region develops a u shape

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Unformatted text preview: lbs to 40,000 lbs and 50,000 lbs. The data on the inefficient region develops a “U” shape-curve as more mechanical energy is added by increasing the WOB, while keeping the hydraulic energy constant. For HSI equal to 7.6 hp/in2 (efficient region), DSE always increases when WOB is increased. The incremental DSE, nonetheless, decreases as WOB is increased from 20,000 lbs to 40,000 lbs. It seems that DSE on the experiment at the efficient region tends to plateau as the mechanical energy is increased, while keeping the hydraulic energy constant. The experiment with HSI equal to 2.9 hp/in2 behaves as it was on the inefficient drilling region with DSE initially decreasing and then increasing when WOB is increased. The “U” shape-pattern develops again. The experiment with HSI equal to 3.3 hp/in2 behaves as it was on the efficient drilling region with DSE always increasing when WOB is increased. The “plateau tendency” is illuminated again. This analysis suggests that a minimum HSI around 3.0 hp/...
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