Roller cone drill bit, method of designing the same and rotary drilling system

摘要

A method of designing a roller cone bit is disclosed. The method comprises the steps of: calculating the trajectory of at least one tooth on each cone through formation material at the cutting face; and jointly optimising both the orientations of said teeth and the width of uncut rings on said cutting face, in dependence on said trajectory. <IMAGE>A method of designing a roller cone bit is disclosed. The method comprises the steps of: calculating the trajectory of at least one tooth on each cone through formation material at the cutting face; and jointly optimising both the orientations of said teeth and the width of uncut rings on said cutting face, in dependence on said trajectory. <IMAGE>