Abstract: Buckling of radially confined oil tubulars is of significant importance to the oil industry.It will affect the life of the tubulars and cause difficulties in drilling and in oil production. Anumber of theoretical models have been developed to study the buckling load and the post-bucklingconfiguration of the tubular, but the most of the past studies have not considered the torsionalloads. Only recently, some investigators based on energy principle have derived some results forbelieal buckling of tubulars sub...