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This work show the relationship between density, friction factor, number of heavy weight drill pipe, number of drill collar, revolution per minute and weight on bit, Direction tools and Torque & Drag in cased and open hole and how the hole geometry effecting on Torque and Drag by using drilling simulator. The procedures and options currently available for this evaluation are reviewed. The central role of torque-drag calculations in this evaluation is well recognized. The Torque and Drag is still one of the important problems faced during drilling operations. In facts, the factors effecting on...