封隔器仿生六棱柱齿状卡瓦微牙痕及稳定性  

Micro Tooth Mark and Stability of Bionic Hexagonal Prism Tooth Slip of Packer

作　　者：徐建宁[1] 邓冲 李万钟[1] XU Jian-ning;DENG Chong;LI Wan-zhong(School of Mechanical Engineering, Xi'an Shiyou University, Xi'an 710065, China)

机构地区：[1]西安石油大学机械工程学院,西安710065

出　　处：《科学技术与工程》2022年第15期6075-6083,共9页Science Technology and Engineering

基　　金：陕西省教育厅科研计划项目(19JK0659);陕西省自然科学基础研究计划(2021JQ-606)。

摘　　要：为解决常规封隔器卡瓦在长期锚定套管壁时,卡瓦牙与套管接触面形成咬痕,过大的嵌入深度可能会导致套管损坏、失效,使套管壁遭到破坏。通过对比常规齿状卡瓦牙型结构参数,构建仿生六棱柱齿状卡瓦牙型结构参数,建立锥体-卡瓦-套管三维接触有限元模型,采用有限元数值模拟和正交优化相结合的方法得出仿生六棱柱齿状卡瓦最佳牙型结构参数为:卡瓦牙倾角α′=18°、正六边形外接圆直径d=6 mm、相邻六棱柱卡瓦牙间距s=0.5 mm、卡瓦牙上底高c=0.5 mm和卡瓦锥角γ′=15°。结果表明:优化后的仿生六棱柱齿状卡瓦比优化后的常规齿状卡瓦在套管内表面产生的应力减小了14.61%~15.25%,牙痕深度了减小44.12%~47.10%,可见仿生六棱柱齿状卡瓦的微牙痕效果。同时,由数值模拟得出不同摩擦系数下常规齿状卡瓦和仿生六棱柱齿状卡瓦与套管接触压力的合力随时间变化曲线,摩擦应力的合力随时间变化曲线和接触面积随时间变化曲线,从曲线可以得出仿生六棱柱齿状卡瓦的稳定性要优于常规齿状卡瓦。In order to solve the problem that bite marks are formed on the contact surface between the slip teeth and the casing when the slip of conventional packer anchors the casing for a long time and excessive embedding depth may lead to damage and failure of the casing.Compared with the tooth structure parameters of conventional tooth slip,the tooth structure parameters of bionic hexagonal prism tooth slip were constructed and the three-dimensional contact finite element model of cone,slip and casing was established.Using the method of finite element numerical simulation and orthogonal optimization,the optimal tooth structure parameters of bionic hexagonal prism tooth slip are as follows.The slip tooth inclinationα′=18°,the diameter of circumcircle of regular hexagon d=6 mm,the spacing of adjacent hexagonal slip teeth s=0.5 mm,the upper line height of slip c=0.5 mm and the cone angle of slipγ′=15°.The results show that the stress of the optimized bionic hexagonal prism tooth slip on the inner surface of the casing is reduced by 14.61%~15.25%and the tooth mark depth is reduced by 44.12%~47.10%compared with the optimized conventional tooth slip,which proves the micro tooth mark effect of the bionic hexagonal prism slip.At the same time,the time-varying curves of Normal contact force,the time-varying curve of Contact frictional stress and the time-varying curve of Contact area are obtained between slip and casing by numerical simulation under different friction coefficients.The curves show that the stability of the bionic hexagonal prism tooth slip is better than the conventional tooth slip.

关 键 词：封隔器卡瓦 仿生六棱柱 有限元仿真 微牙痕 稳定性 

分 类 号：TE931.2[石油与天然气工程—石油机械设备]