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A STUDY ON EFFECT OF DRAG & TORQUE ON BUCKLING OF ...
www.arpapress.comIJRRAS 11 (1) April 2012 Bagadi & al. Buckling of Drillstring in Horizontal Wells 122 2.8 0.504) 0.496( sin )0.511 r F hel EI W D (3) Lubinski continue studying the effects of changes in temperature and pressure. The study led to the derivation of the helix pitch-force relationship: