... operation dimensionless critical load pipe natural boundary condition Directional Drilling friction crh Miska drillstring design dimensionless axial load boundary condition buckled pipe configuration Eqn helix turn loading end axial load wellbore Upstream Oil & Gas Lateral Friction...

... works. Different aspects of the phenomenon are discussed including sinusoidal (lateral) and helical buckling and influence of torque. torque derivation drillstring design houston horizontal well friction expression buckled pipe wellbore lubinski miska artificial intelligence pipe...

... ABSTRACT This paper studies helical buckling, and also critical (sinusoidal) buckling, of pipes (tubing and drillstring) in horizontal wells. The large frictional drag of helically buckled pipes is also studied. Helical buckling is developed from critical (sinusoidal) buckling as the axial...