高温下橡胶应力松弛行为对封隔器密封性能的影响研究  

Effects of rubber stress relaxation on packer sealing performance at high temperature

作　　者：李斌[1] 于富盛 郑旭 王军锋[2] Li Bin;Yu Fusheng;Zheng Xu;Wang Junfeng(School of Mechanical Engineering,Southwest Petroleum University,610500,Chengdu,China;Changqing cementing company of CNPC Chuanqing Drilling Engineering Co.,Ltd,710018,Xi'an,China)

机构地区：[1]西南石油大学机电工程学院,成都610500 [2]中石油川庆钻探工程有限公司长庆固井公司,西安710018

出　　处：《应用力学学报》2020年第5期2153-2159,I0022,I0023,共9页Chinese Journal of Applied Mechanics

摘　　要：由于橡胶材料的温度特性和时间特性,封隔器胶筒的密封性能自坐封成功后是不断衰减的。本文对大芦湖东部某井的Y344压缩式封隔器氟橡胶胶筒材料进行高温下的样本单轴拉伸试验和应力松弛试验。根据试验结果拟合相应的超弹性本构模型和黏弹性本构模型,并建立Y344压缩式封隔器的有限元模型进行仿真分析。结果表明:橡胶材料高温下的应力松弛导致胶筒的最大剪切应力、最大接触应力、线压和面压均有不同程度的下降,导致封隔器的密封性能和密封可靠性下降。因此,在考虑封隔器胶筒密封性能时,有必要考虑胶筒橡胶材料应力松弛行为带来的影响。Due to the temperature characteristics and time characteristics of the rubber material, the sealing performance of the packer rubber is continuously attenuated after successful sealing. In this paper, the uniaxial tensile test and stress relaxation test of the fluorine rubber material of the Y344 compression packer rubber at high temperature were carried out in a well in the eastern part of Daluhu. According to the test results, the corresponding hyperelastic constitutive model and viscoelastic constitutive model are fitted, and the finite element model of Y344 compression packer is established for simulation analysis. The results show that the stress relaxation of the rubbermaterial at high temperature causes the maximum shear stress, maximum contact stress, line pressure and surface pressure of the rubber to decrease 15%, resulting in a decrease in the sealing performance and sealing reliability of the packer. Therefore, it is necessary to consider the effects of the stress relaxation behavior of the rubber when investigating the sealing performance of the packer rubber.

关 键 词：压缩式封隔器 应力松弛 高温试验 氟橡胶 黏弹性本构模型 

分 类 号：TE938[石油与天然气工程—石油机械设备]