Interactions between Torque and Helical Buckling in Drilling

Abstract

Abstract The effects of torque on helical buckling are a concern in coiled tubing drilling. These effects are also important in conventional drilling of long horizontal wells. This paper presents theoretical models for the effects of torque on helical buckling, normal contact force, and pitch of helix in the curved well bore. The effects of helical buckling and the post-buckling contact forces on torque and drag in a drilling operation are also modelled. The models are used for realistic simulations for both conventional drilling and coiled tubing applications.