Drillsting Design Problem

[HamzaSaad39]

The power of a rig drawworks is 311 hp, knowing that ten lines are strung between the crown block and travelling block, and fast line has a velocity 14.22 ft/s; calculate The maximum real weight of the drill string which can be pulled out of the hole in a velocity of 3 in/s, if the drilling fluid has a MW of 9.4 ppg.( the average density of carbon steel is 490 lb/ft3)