关键词: 管柱, 螺旋屈曲, 光弹分析, 接触压力

Abstract: The tubing string is forced by various loads during the production period of the well.An axially loaded tubing string buckles helicaliy and produces wall contact force when constrained within the casing or well wall.The tubing string can be damaged in severe case.In this paper,typical expression of contact force of some savant is summarized.It is very different to calculate results for them.According to needs of engineering application,wall contact force on helical buckled tubing is studied by means of theory and detected by means of the first experiment about the contact force.The experiment method and device were put forward.The experiment results produced form 3-dimensional photoelastical tests of the freezed stress have been given.The distribution of wall contact forces in three sections is presented.The more reasonable expressions are given for engineering application.The different expressions of wall contact force in some papers presented are analyzed according to the works.These works provide scientific basis for analyzing the applied load and engineering application of helical buckled tubing string in wells.

Key words: pipe string, helical buckled, photo elastic analysis, contact force