基于正交试验的压缩式封隔器胶筒的结构参数优化
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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 3 D 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.
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 3 D 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.
引文
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[10]王云学,许仁波,孟奇龙,江能.压缩式封隔器胶筒接触力学行为有限元分析[J].武汉科技大学学报,2017,40(1):61-64.Wang Yunxue,Xu Renbo,Meng Qilong&Jiang Neng.Mechanical behaviors of contact of compressive packer's rubber sleeve:A finite element analysis[J].Journal of Wuhan University of Science and Technology,2017,40(1):61-64.
[11]李斌,卢大伟,张作鹏.压缩式封隔器波浪形胶筒力学性能分析[J].应用力学学报,2018,35(4):828-833.Li Bin,Lu Dawei&Zhang Zuopeng.Analysis of mechanical properties of wave packer rubber[J].Chinese Journal of Applied Mechanics,2018,35(4):828-833.
[12]郑明军,谢基龙.压缩状态下橡胶件大变形有限元分析[J].北方交通大学学报,2001,25(1):76-79.Zheng Mingjun&Xie Jilong.Finite element analysis of large deformation of compressed rubber component[J].Journal of Northern Jiaotong University,2001,25(1):76-79.
[13]钟卫平.封隔器胶筒密封性能研究[D].北京:中国石油大学,2016.Zhong Weiping.Sealing performance research on the compression packer rubbers[D].Beijing:China University of Petroleum,2016.
[14]曲宝龙,徐华静,马卫国.基于摩擦因数的封隔器胶筒优化设计[J].石油机械,2015,43(2):83-87.Qu Baolong,Xu Huajing&Ma Weiguo.Optimal design of packer rubber based on friction coefficient[J].China Petroleum Machinery,2015,43(2):83-87.
[15]吴建,徐兴平,王龙庭,张秋梅.常规高压封隔器密封胶筒力学分析[J].石油矿场机械,2008,37(6):39-41.Wu Jian,Xu Xingping,Wang Longting&Zhang Qiumei.Mechanical analysis of the conventional high pressure rubber barrel of packers[J].Oil Field Equipment,2008,37(6):39-41.
[16]李楠.压缩式封隔器胶筒的密封性能研究[D].大庆:东北石油大学,2012.Li Nan.Seal performance research of the compressed sealing rubber of the packer[D].Daqing:Northeast Petroleum University,2012.
[2]张奎林,谷磊.尾管顶部封隔器密封胶筒设计与试验[J].断块油气田,2018,25(3):381-384.Zhang Kuilin&Gu Lei.Design and experiment research on sealing rubber tube of top packer of liner hanger[J].Fault-Block Oil&Gas Field,2018,25(3):381-384.
[3]李英松,钟卫平,边杰,崔光宇,周先军.过电缆封隔器胶筒耐压试验及接触应力测试[J].石油机械,2016,44(6):106-109.Li Yingsong,Zhong Weiping,Bian Jie,Cui Guangyu&Zhou Xianjun.Pressure test and contact stress test of cable-through packer rubber[J].China Petroleum Machinery,2016,44(6):106-109.
[4]Polonsky VL&Tyurin AP.Design of packers for sealing of the inter-tube space in equipment used for recovery of oil and gas[J].Chemical and Petroleum Engineering,2015,51(1/2):37-40.
[5]Hu Gang,Zhang Peng,Wang Guorong,Zhang Min&Li Ming.The influence of rubber material on sealing performance of packing element in compression packer[J].Journal of Natural Gas Science and Engineering,2017,38:120-138.
[6]Ma Weiguo,Qu Baolong&Guan Feng.Effect of the friction coefficient for contact pressure of packer rubber[J].Proceedings of the Institution of Mechanical Engineers Part C:Journal of Mechanical Engineering Science,2014,228(16):2881-2887.
[7]仝少凯.压缩式封隔器胶筒力学性能分析[J].石油矿场机械,2012,41(12):1-7.Tong Shaokai.Mechanical properties analysis of compressed packing rubber during axial compressing[J].Oil Field Equipment,2012,41(12):1-7.
[8]于桂杰,李长江,孙宝全,蔡风涛,张福涛.压缩式封隔器异型胶筒密封性能分析[J].润滑与密封,2015,40(1):45-48.Yu Guijie,Li Changjiang,Sun Baoquan,Cai Fengtao&Zhang Futao.Sealing performance analysis on shaped rubber of compressed packers[J].Lubrication Engineering,2015,40(1):45-48.
[9]任露泉.试验优化设计与分析[M].北京:高等教育出版社,2003.Ren Luquan.Optimum design and analysis of experiments[M].Beijing:Higher Education Press,2003.
[10]王云学,许仁波,孟奇龙,江能.压缩式封隔器胶筒接触力学行为有限元分析[J].武汉科技大学学报,2017,40(1):61-64.Wang Yunxue,Xu Renbo,Meng Qilong&Jiang Neng.Mechanical behaviors of contact of compressive packer's rubber sleeve:A finite element analysis[J].Journal of Wuhan University of Science and Technology,2017,40(1):61-64.
[11]李斌,卢大伟,张作鹏.压缩式封隔器波浪形胶筒力学性能分析[J].应用力学学报,2018,35(4):828-833.Li Bin,Lu Dawei&Zhang Zuopeng.Analysis of mechanical properties of wave packer rubber[J].Chinese Journal of Applied Mechanics,2018,35(4):828-833.
[12]郑明军,谢基龙.压缩状态下橡胶件大变形有限元分析[J].北方交通大学学报,2001,25(1):76-79.Zheng Mingjun&Xie Jilong.Finite element analysis of large deformation of compressed rubber component[J].Journal of Northern Jiaotong University,2001,25(1):76-79.
[13]钟卫平.封隔器胶筒密封性能研究[D].北京:中国石油大学,2016.Zhong Weiping.Sealing performance research on the compression packer rubbers[D].Beijing:China University of Petroleum,2016.
[14]曲宝龙,徐华静,马卫国.基于摩擦因数的封隔器胶筒优化设计[J].石油机械,2015,43(2):83-87.Qu Baolong,Xu Huajing&Ma Weiguo.Optimal design of packer rubber based on friction coefficient[J].China Petroleum Machinery,2015,43(2):83-87.
[15]吴建,徐兴平,王龙庭,张秋梅.常规高压封隔器密封胶筒力学分析[J].石油矿场机械,2008,37(6):39-41.Wu Jian,Xu Xingping,Wang Longting&Zhang Qiumei.Mechanical analysis of the conventional high pressure rubber barrel of packers[J].Oil Field Equipment,2008,37(6):39-41.
[16]李楠.压缩式封隔器胶筒的密封性能研究[D].大庆:东北石油大学,2012.Li Nan.Seal performance research of the compressed sealing rubber of the packer[D].Daqing:Northeast Petroleum University,2012.