rpm= ⎛OD −ID Example: Determine the critical rotary speed for a 10,000 ft drill string consisting of 5 in OD/ in ID drill pipe and 800 ft drill collars Solution: Longitudinal rpm (Eq. 18) = rpm Transversal rpm (Eq. 19) = 242 rpm Drill collar length Drill collars assumed to be fixed at the drill bit and free at
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