第15卷第2期 2017年4月
中国工程机械学报
CHINESE JOURNAL OF CONSTRUCTION MACHINERY
Vol. 15 No.2 Apr.2017
具有台阶密封面油套管接头力学性能有限元分析
商靖宇1,2，安琦1
（1.华东理工大学机械与动力工程学院，上海200237；2.上海电力学院数理学院，上海200090）
摘要；以具有台阶密封面结构的锥形油套管接头为研究对象，以美国石油学会（APD圆螺纹套管接头为例，通过有限元分析计算，研究了锥螺纹联接上扣疗紧时，紧圈数和密封面初始间欧对密封面上挤压力、螺纹轴向力和轴向累计弹性变形量的影响规律.结果表明：在密封面初始间隙一定的条件下，螺纹接头拧紧匾数增大使密封面上挤压力、螺纹轴向力和轴向累计弹性变形量增大；当紧圈数相同时，密封面初始间隙越小，密封面上挤压力、螺纹轴向力和轴向累计弹性变形量越大
关键词：台阶油套管接头；有限元分析；力学性能；密封面初始间隙
文章编号：16725581(2017)02013006
中图分类号：TH131.3;TE256.9
文献标志码：A
Finiteelementanalysisofmechanicalperformanceforthe tubing and casing connection with sealing shouldered face
MANJingyul-2,ANQi
(1. School of Mechanical and Power Engineering,East China University of Science and Technology, Shanghai 200237,China;
2. School of Mathematics and Physics, Shanghai University of Electric Power,Shanghai 200090,China)
Abstract: In this paper,the tubing and casing conical threaded connection with a sealing shoulder face is taken as the research object. An API conical casing threaded connection is taken as the sample and the influences of the tightening cycle and initial sealing clearance on the extrusion force on the sealing face, the axial load and the accumulative axial elastic deformation of each thread are calculated and modeled by finite element analysis. The results show that the extrusion force on the sealing face, the axial load and the accumulative axial elastic elongation(compression)variation of each thread will increase with the increase of the tightening cycle under a certain initial seal clearance. Under the same tightening cycle,a smaller initial sealing clearance can lead to larger the extrusion force on the sealing face,the axial load and the accumulative axial elastic elongation(compression)variation of each thread.
Key words: tubing and casing threaded connection with shouldered sealing face; finite element analysis; mechanical performance; initial sealing clearance
油套管接头往往具有台阶密封面结构，这种螺纹联接在紧时通过台阶密封面的压紧作用可实现密封效果.研究表明，螺纹联接处是油套管联接中最薄弱的环节，油套管失效事故60%以上发生在螺纹联接部位}].由于台阶密封面的存在，使得螺纹面的受力更加复杂，对其拧紧过程进行力学分析十分必要，
有限元法是研究螺纹联接力学行为的有效方
法之一，习俊通等(2研究了套管螺纹接头在上扣过盈、轴向拉伸及内压3种工况下各圈螺纹轴向载荷的分布情况，结果表明：3种工况下各圈螺纹轴向载荷分布都是不均匀的，这种载荷分配的不均匀性对套管螺纹接头的抗拉性能有重要影响.Baragetti[3] 研究了锥度变化对具有台肩结构锥螺纹接头载荷分布的影响，研究表明：在一定范围内减小螺纹锥度可有效改善螺纹接头载荷分布的不均匀性.高连
作者简介：鹿靖字（1972—），男，博士生.E-mail.shiepmjy@163.com 万方数据