基于ANSYS的套管螺纹应力分析

摘要

石油套管在井下受力复杂,其螺纹连接是套管的薄弱环节。在目前发现的套损中有很大的比例是由螺纹连接失效造成的,因此真实地模拟井下受力情况,并且准确的测出在不同工况与螺纹部位的应力应变场的关系,对研究套管螺纹连接的极限承载能力,保护套管,保证油田正常生产具有十分重要的意义。文章采用ANSYS软件提供的子模型方法,通过有限元分析方法研究套管螺纹受力状况及变形情况,模拟井下复杂工况环境对套管螺纹的影响,优化螺纹结构,使应力分布更加合理。%Oil Casing is important to oil drilling equipment.Oil pipe in the underground stands complex stress,so oil casing pipe thread connection is the weak link.In the current,a large proportion of damage in the casing is caused by the failure of threaded connections.Realistic simulating the forces underground and accurately measuring the relationship between different conditions and stress or strain fields in threads are important.It is significant to study the limit of carrying capacity of casing thread connection,protecting the casing,and ensuring normal production of oil.Stress Analysis of casing threads are senior non-linear finite element contact problems,so we generally use special nonlinear analysis software.Based on researching the overall stress in the oil casing thread computation,the research is completed by sub-model method provided by ANSYS program.