摘要
油套管特殊螺纹主要通过金属对金属的径向过盈主密封结构保证油套管连接的气密封性能。针对特殊螺纹密封性能开展数值模拟评价研究,并提出优化特殊螺纹气密封结构的方法。首先建立了特殊螺纹锥面对锥面密封结构的数值仿真模型,研究了等锥面密封结构和非等锥面的密封面上接触应力分布关系,研究发现,若采用非等锥线性密封结构的密封接头,能够有效改善特殊螺纹密封面上接触不协调现象,改善密封面上接触应力的分布;其次,建立了特殊螺纹球面对锥面密封结构的数值仿真模型,引入密封接触能理论,研究了不同椭圆度下的球面密封结构密封面上接触应力分布关系,并给出特殊螺纹球面密封椭圆度的最佳取值范围。研究结果可以为提高特殊螺纹抗泄漏能力提供理论依据,为特殊螺纹密封结构的研发提供思路借鉴。
The sealability of the casing and tubing premium connections is guaranteed by the metal-to-metal radial interference fit construction. In order to understand the sealing structure of the premium connection,a numerical simulation model was established in this paper,and optimization method of the premium connection sealing structure was proposed. First,a numerical emulation model was developed to investigate the sealing structure of the cone-to-cone interference fit between two contact interfaces. The distribution characteristics of contact stress on the sealing surface of identical conical surface and non-identical conical surface were studied. The simulation results show that the sealing joint introducing non-identical cone linear sealing structure was able to improve the uncoordinated phenomenon of the contact on the sealing surface of the premium connection and improve the contact stress distribution on the sealing surface. Second,a numerical emulation model of ball-to-cone sealing structure was established,and sealing contact energy theory was introduced. The contact stress distribution relation on the sealing surface of spherical sealing structure under different tapers was studied,and the best range of taper of premium connection spherical seal was recommended.The research results can provide theoretical basis for improving the leakage resistance of premium connection and provides a reference for the research and development of premium connection sealing structure.
作者
张颖
练章华
周谧
林铁军
罗伟强
Zhang Ying;Lian Zhanghua;Zhou Mi;Lin Tiejun;Luo Weiqiang(School of Mechanical Engineering,Sichuan University of Science&Engineering,Zigong 643000,China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China)
出处
《压力容器》
北大核心
2019年第12期23-29,共7页
Pressure Vessel Technology
基金
国家自然科学基金面上项目(51574198)
四川轻化工大学人才引进项目(2019RC17)
四川省高校重点实验室开发基金项目(GK201914,GK201910)
自贡市重点科技计划项目(2019YYJC01)
关键词
特殊螺纹
密封结构
接触应力
有限元
premium connection
sealing structure
contact stress
finite element
