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You can even perform a home based experiment to experience this situation.The drill string exerts a force on the formation as shown in figure.As tension on the drill string increases (depth below dogleg increases) the lateral force increases; therefore, the torque and drag increase.Since the drill pipe is in rotational as well as performs linear motion, the drill string experiences both TORQUE & DRAG.Torque and drag are caused by the friction between the drill string and the borehole wall.


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