A drill string consists of a length of drill pipes and 70000 lbs of drill collars is used to drill a well from 5000 ft to 6000 ft depth with a work of 120 tone-miles. Use below data to calculate the derrick load. Data: + 264000d Mud weight; 1.321 gm/cc T, =), D(Ls+DxW. D(M+S 10560000 Traveling block weight: 25000 lb Drill collar nominal weight: 200 lb/ft Line and sheave efficiency: 0.95 1 [D(L+D)XWS Ts = Number of strung lines: 12 MD + 2640000 10560000