基于正交试验的压缩式封隔器胶筒的结构参数优化  

Structural parameters optimization of compression packer rubber based on orthogonal test

作　　者：张智 祝效华[2] 许建波 Zhang Zhi;Zhu Xiaohua;Xu Jianbo(Chengdu Zhongteng Petroleum Engineering Technology Co., Ltd., Chengdu, Sichuan 610500, China;School of Mechatronic Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China;Downhole Operation Company, Sinopec Shengli Oilfield Service Corporation, Dongying, Shandong 257000, China)

机构地区：[1]成都中腾石油工程技术有限公司 [2]西南石油大学机电工程学院 [3]中石化胜利石油工程有限公司井下作业公司

出　　处：《天然气工业》2019年第3期80-84,共5页Natural Gas Industry

基　　金：国家自然科学基金项目(编号:51674214);四川省青年科技创新团队项目(编号:2017TD0025);四川省科技计划国际合作计划项目(编号:2016HH0008)

摘　　要：主要用于封隔油管与套管环形空间的封隔器胶筒在现场使用中常常出现密封失效和撕裂失效等问题。为了解决上述突出问题,基于虚功原理、Von Mises屈服原则及接触非线性理论,建立了压缩式封隔器胶筒工作中的三维有限元计算模型,采用正交优化方法,对胶筒的关键结构参数长度、厚度和倒角尺寸进行了优化,获得了胶筒关键结构参数的最优组合方案,并对优化前后封隔器胶筒的力学性能进行了对比分析。研究结果表明:①对胶筒密封性能影响由大到小的因素排序为:厚度、倒角尺寸、长度;②胶筒关键结构参数的最优组合应为长度80 mm、厚度20 mm、倒角尺寸10 mm;③较之于优化前,优化后的胶筒与套管间的最大接触应力平均提高70.44%、胶筒最大Mises应力平均降低15.72%、胶筒的压缩距平均降低37.82%;④在相同坐封载荷作用下,优化后的胶筒增大了胶筒与套管间的接触应力、降低了胶筒自身的Mises应力。结论认为,经过参数优化后的封隔器胶筒能够更好地满足现场使用中的密封性能和寿命要求。When the packer rubber which is mainly used to seal the tubing-casing annulus is applied on site, it often suffers seal failure and tear failure. In this paper, a 3D finite element calculation model for compression packer rubber was established based on the virtual work principle, Von Mises yield criterion and nonlinear contact theory to deal with above mentioned problems. By using the orthogonal optimization method, the key structural parameters of packer rubber (length, thickness and chamfering dimension) were optimized and their optimal combination scheme was prepared. In addition, the mechanical property of packer rubber before and after the optimization was analyzed and compared. And the following research results were obtained. First, the factors influencing the sealing performance of packer rubber are ranked from the top to the bottom as thickness, chamfering dimension and length. Second, the optimal combination of the key structural parameters of the packer rubber is: length 80 mm, thickness 20 mm and chamfering dimension 10 mm. Third, after optimization, the maximum contact stress between a packer rubber and a casing is increased by 70.44% on average, the maximum Mises stress of the packer rubber is decreased by 15.72% on average, and the compression distance is decreased by 37.82% on average. Fourth, under the same setting load, the optimized packer rubber increases the contact pressure between the packer rubber and the casing and reduces the Mises stress of the packer rubber itself. In conclusion, the optimized packer rubber can better satisfy the on-site requirements of sealing performance and service life.

关 键 词：封隔器胶筒 正交优化 接触应力 Von-Mises 应力 压缩距 密封性能 使用寿命 

分 类 号：TE931.2[石油与天然气工程—石油机械设备]