Abstract
Summary The effect of connectors on pipe buckling has only recently received attention. For nonbuckled pipe, Lubinski analyzed the effect of connectors on pipe in tension in a curved borehole, and Paslay and Cernocky extended this analysis to pipe in compression. The first analysis of buckled pipe with connectors was done by Mitchell, who developed a 3D analysis of helical buckling. These papers indicate that bending stresses are greater because of connector standoff. Laterally buckled pipe with connectors is analyzed for the first time in this paper. It presents an analytic solution of the beam-column equations in 3D in a horizontal wellbore with pipe weight. Pipe deflections, contact loads, and bending stresses are determined with explicit formulas. Sag between connectors is calculated so that pipe body contact with the wellbore between connectors can be determined. Applications include the analysis of bottomhole assemblies, drillpipe, casing, and tubing. The solutions are simple formulas that are suitable for hand calculations.
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