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milled tooth bit drilled 2,461 ft of limestone in 150 rotating hours. Other relevant data for this bit is: Trip time (T) 8 hrs ,Bit cost (B) = $3,000, Rig cost = 900 $/hr It is proposed to replace this bit with an insert-type bit costing 8,500. calculate the rotating time required of the new bit at breakeven cost for equal penetration rates. Solution : note that at break even analysis cost per foot (new bit) = cost per foot (old bit)

milled tooth bit drilled 2,461 ft of limestone in 150 rotating hours. Other relevant data for this bit is: Trip time (T) 8 hrs ,Bit cost (B) = $3,000, Rig cost = 900 $/hr It is proposed to replace this bit with an insert-type bit costing 8,500. calculate the rotating time required of the new bit at breakeven cost for equal penetration rates. Solution : note that at break even analysis cost per foot (new bit) = cost per foot (old bit)

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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break even analysis milled tooth bit drilled 2,461 ft of limestone in 150 rotating hours. Other relevant data for this bit is: Trip time (T) = 8 hrs ,Bit cost (B) = $3,000 , Rig cost = 900 $/hr It is proposed to replace this bit with an insert-type bit costing 8,500. calculate the rotating time required of the new bit at breakeven cost for equal penetration rates. Solution : note that at break even analysis cost per foot (new bit) = cost per foot (old bit)
Transcribed Image Text:break even analysis milled tooth bit drilled 2,461 ft of limestone in 150 rotating hours. Other relevant data for this bit is: Trip time (T) = 8 hrs ,Bit cost (B) = $3,000 , Rig cost = 900 $/hr It is proposed to replace this bit with an insert-type bit costing 8,500. calculate the rotating time required of the new bit at breakeven cost for equal penetration rates. Solution : note that at break even analysis cost per foot (new bit) = cost per foot (old bit)
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