摘要
高压气井的套管在下入过程中,随隔水管在海洋环境中发生弯曲变形或振动,承受非均匀外载,使接头密封结构变形不一致,导致密封性能降低。应用线性Drucker-Prager塑性模型模拟作为套管接头二级密封的聚四氟乙烯密封圈,应用ABAQUS有限元软件建立高压气井套管接头密封模型,并分析聚四氟乙烯密封圈在内外压力作用下环密封面上的接触应力。结果表明:当套管外壁有集中载荷作用时,密封面上接触应力呈波浪形变化;集中载荷作用区域两侧60°位置上的密封面的接触应力最低,是套管密封最容易失效的区域。
During the running process of the high-pressure gas well casing,it will suffer from uneven external load due to the bending deformation or vibration caused by the ocean load,and result in the non-uniform deformation of the joint seal structure and the decline of its sealing performance.The linear Drucker-Prager plastic model was used to simulate the PTFE seal,which was used as the two stage seal of casing joint.Finite element model of high-pressure gas well casing was established by ABAQUS,and the contact stress on the ring sealing surface under the action of internal and external pressure was analyzed.The results show that when the outer wall of the casing has concentrated load,the contact stress on the sealing surface is in wavy change.The contact stress on the sealing surface is the lowest in the 60° position on both sides of the concentrated load zone,and which is the area where the casing is easiest to leak.
作者
白莉
宋存德
刘刚
BAI Li;SONG Cunde;LIU Gang(School of Petroleum Engineering,China University of Petroleum,Qingdao Shandong 266000,Chin)
出处
《润滑与密封》
CAS
CSCD
北大核心
2018年第6期12-17,共6页
Lubrication Engineering
基金
国家重点研发计划项目(2016YFC0303408)
国家重点基础研究发展计划(973计划)项目(2015CB251206)
