A formation at a depth of 6,400 ft is to be drilled using 6,000 ft, 5-in....

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A formation at a depth of 6,400 ft is to be drilled using 6,000 ft, 5-in. drill pipe (wt. 19.5 lb/ft) and 400 ft 8-in. drill collar (wt. = 220 lb/ft) with a 13.3 ppg mud. Bit records for 3 different bits are shown below. Find the suitable bit if the rig rental cost is $36,000/day, hook HP = 280 HP and it takes 25 sec. to screw or unscrew one stand. Bit Bit Cost, $/hr Interval, ROP, ft/hr A B 800 400 450 830 780 1050 14 25 22 Motor Cost, $ Bit Salvage Value, $ 1200 1000 1500 0.0 0.0 800 A formation at a depth of 6,400 ft is to be drilled using 6,000 ft, 5-in. drill pipe (wt. 19.5 lb/ft) and 400 ft 8-in. drill collar (wt. = 220 lb/ft) with a 13.3 ppg mud. Bit records for 3 different bits are shown below. Find the suitable bit if the rig rental cost is $36,000/day, hook HP = 280 HP and it takes 25 sec. to screw or unscrew one stand. Bit Bit Cost, $/hr Interval, ROP, ft/hr A B 800 400 450 830 780 1050 14 25 22 Motor Cost, $ Bit Salvage Value, $ 1200 1000 1500 0.0 0.0 800

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first we calculate the time required to drill each for Bit A T... View the full answer