To explore the buckling form of the straight long tube under complicated conditions,the buckling analysis based on the beam-to-beam contact theory is carried out.The beam is discretized according to the beam-to-beam contact theory in consideration of shear and bending deformation.The finite element method (FEM) model considering the variable section and frictional contact is built,where the tube-to-tube contact element is used.By using this method,the FEM model concerned with the layered production's actual working conditions is presented.The result turns out that the tube's buckling form under the complex condition,is multiple and not equidistant.Moreover,the buckling form with friction is not the standard sine type or the spiral configuration,and the reliability of these results has been proved by the magnetic positioning data.%为探究长直管柱在井下复杂工况下的屈曲形式,进行基于梁-梁接触理论的管柱屈曲分析研究.利用梁-梁接触理论对考虑剪切弯曲变形的梁进行离散化,使用管-管接触单元建立管柱变截面摩擦接触有限元模型,并用此方法针对分层采油井实际井况建立管柱有限元分析模型.结果表明,分层采油管柱在井下复杂的受力环境下会发生不等距复合屈曲,在考虑摩擦的情况下管柱的屈曲构型不再是标准的正弦线或是螺旋线构型,并利用磁定位数据验证了计算结果的可靠性.
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