摘要
以Y344-142裸眼压裂封隔器为例,在120℃工作温度环境下,通过单轴拉伸试验、平面拉伸试验和等双轴拉伸试验,测定橡胶不同受力状态的应力-应变曲线,确定Mooney-Rivilin橡胶本构模型与材料参数。利用有限元方法,建立了封隔器密封结构分析模型,分析得出了Y344-142裸眼压裂封隔器在坐封力为82k N时,最大剪应力为6.68MPa,最大压应力为19.38MPa,最大接触应力为4.64MPa。提出了用压缩率、密封性系数、线压、面压评价封隔器胶筒密封性和可靠性的方法,该评价方法成功预测了樊154块封隔器的密封性能,在优化封隔器胶筒、判断失效形式上有推广意义。
Sealing component which always use rubbers as sealing materials are key component of packers, and sealing performance of packers at room temperature has been studied by a large number of researchers. However, the evaluation methods of the sealing and reliability of the rubber of packers at working temperature are not perfect yet. Uniaxial tensile test, planar tensile test and biaxial tensile test are adopted to obtain the stress-strain plots of the rubbers of Y344-142 open-hole fracturing packer on deferent strained conditions at 120℃, and then Mooney-Rivilin constitutive model is selected and material parameters is calculated. The analysis model of seal structure of packer is established by the finite element methods, and the stress state of Y344-142 open-hole fracturing packer is obtained while setting force is 82 kN. Compression rate, sealing ratio, line pressure and face pressure are putted forward to evaluate the sealing and reliability, and the evaluation methods have remarkable effectiveness in oil filed test. It is of great popularizing significance for structural optimization and failure analysis of the rubbers.
出处
《应用力学学报》
CSCD
北大核心
2017年第6期1079-1085,共7页
Chinese Journal of Applied Mechanics
关键词
封隔器胶筒
工作温度
密封性能
评价方法
packer rubber
working temperature
sealing performance
evaluation methods
