封隔压差与间隙对封隔器胶筒性能的影响
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摘要
为探讨封隔压差和封隔间隙对封隔器胶筒封隔性能的影响,应用有限元分析软件,研究不同封隔压差和间隙下胶筒的Von Mises应力分布、胶筒与套管壁间接触应力的分布以及胶筒的变形情况。结果表明:随着封隔压差的增大,胶筒上端部的Von Mises应力值不断增大,胶筒失效的可能性增加,但胶筒与套管壁的接触应力值增大,胶筒的封隔能力增强;随着封隔间隙的增大,胶筒上端Von Mises应力值增大,胶筒剪切失效的可能性增加,且胶筒与套管壁的接触应力减小,胶筒的封隔能力下降。设计出一种蜗形状防突装置,分析其对胶筒封隔性能的影响。结果表明:蜗形保护环能有效地防止胶筒端部突出,且胶筒的应力分布更均匀,胶筒与套管壁间的接触应力值更大,提高了胶筒的封隔能力。
In order to investigate the effect of sealing differential pressure and clearance on packing rubber of the packer,Von Mises stress distribution of packing rubber,the contact stress distribution between packing rubber and the casing wall,and the deformation of the packing rubber under different pressure and clearance were analyzed based on the finite element software.The results show that,with the increasing of sealing differential pressure,Von Mises stress value of packing rubber's upper part is constantly increased,which may lead to the failure of packing rubber,but the contact stress between packing rubber and the casing wall is increased and sealing ability of packing rubber is improved. With the increasing of sealing clearance,Von Mises stress value of packing rubber's upper part is constantly increased,the possibility of packing rubber shearing failure is also increased,and the contact stress between packing rubber and the casing wall is decreased which causes the decrease of sealing ability of packing rubber. A worm shaped anti-extrusion ring was designed and its effect on the sealing performance of packing rubber was analyzed.The results show worm shaped protection rings can effectively prevent packing rubber protruding,the packing rubber has more uniform stress distribution and higher contact stress between packing rubber and the casing wall,so the sealing ability of packing rubber is improved.
In order to investigate the effect of sealing differential pressure and clearance on packing rubber of the packer,Von Mises stress distribution of packing rubber,the contact stress distribution between packing rubber and the casing wall,and the deformation of the packing rubber under different pressure and clearance were analyzed based on the finite element software.The results show that,with the increasing of sealing differential pressure,Von Mises stress value of packing rubber's upper part is constantly increased,which may lead to the failure of packing rubber,but the contact stress between packing rubber and the casing wall is increased and sealing ability of packing rubber is improved. With the increasing of sealing clearance,Von Mises stress value of packing rubber's upper part is constantly increased,the possibility of packing rubber shearing failure is also increased,and the contact stress between packing rubber and the casing wall is decreased which causes the decrease of sealing ability of packing rubber. A worm shaped anti-extrusion ring was designed and its effect on the sealing performance of packing rubber was analyzed.The results show worm shaped protection rings can effectively prevent packing rubber protruding,the packing rubber has more uniform stress distribution and higher contact stress between packing rubber and the casing wall,so the sealing ability of packing rubber is improved.
引文
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[4]刘永辉,付建红,林元华,等.封隔器胶筒结构参数优化分析[J].机械工程师,2007(7):66-67.LIU Y H,FU J H,LIN Y H,et al.Optimization analysis of packer rubber’s structural parameters[J].Mechanical Engineer,2007(7):66-67.
[5]李晓芳,杨晓翔,王洪涛.封隔器胶筒接触应力的有限元分析[J].润滑与密封,2005,30(5):90-92.LI X F,YANG X X,WANG H T.Finite element analysis of the contact stress of the sealing rubber of the packer[J].Lubrication Engineering,2005,30(5):90-92.
[6]彭惠芬,王程,王鹏.不同温度下受压封隔器胶筒有限元分析[J].润滑与密封,2014,39(8):44-47.PENG H F,WANG C,WANG P.Finite element analysis of packer rubber cylinder pressurized under different temperature[J].Lubrication Engineering,2014,39(8):44-47.
[7]杨志鹏,刘大伟,许永权,等.压缩式胶筒肩部突出变形试验研究[J].润滑与密封,2012,37(2):103-105.YANG Z P,LIU D W,XU Y Q,et al.The experimental study on the edge protrusive deformationof the compression packing element[J].Lubrication Engineering,2012,37(2):103-105.
[8]仝少凯.压缩式封隔器胶筒力学性能分析[J].石油矿场机械,2012(12):1-7.TONG S K.Mechanical properties analysis of compressed packing rubber during axial compressing[J].Oil Field Equipment,2012(12):1-7.
[9]徐芝纶.弹性力学[M].北京:高等教育出版社,2006:205.
[10]周伟,靳萍,常晓林,等.基于扩展Lagrange乘子的Clough接触面模型及应用[J].岩土力学,2008,29(1):69-74.ZHOU W,JIN P,CHANG X L,et al.Clough contact model based on the augmented Lagrangian multiplier and its application[J].Rock and Soil Mechanics,2008,29(1):68-74.
[11]杨春明,谢禹钧.基于ANSYS的橡胶O形密封圈的密封性能有限元分析[J].弹性体,2010,20(3):49-52.YANG C M,XIE Y J.Analysis of O-shaped sealing ring sealing performance Based on ANSYS[J].China Elastomerics,2010,20(3):49-52.