智能完井O形圈在双侧压力下的静密封分析  

Static Sealing Analysis of O-ring for Intelligent Completion Under Bilateral Pressure

作　　者：郑严[1] 蔡午阳 张辞 钟俊宇 顿志强 王龙 钱韦吉[1] ZHENG Yan;CAI Wuyang;ZHANG Ci;ZHONG Junyu;DUN Zhiqiang;WANG Long;QIAN Weiji(School of Mechanical Electrical,Southwest Petroleum University,Chengdu Sichuan 610500,China;China Petroleum Xinjiang Oilfield Company,Karamay Xinjiang 834000,China)

机构地区：[1]西南石油大学机电工程学院,四川成都610500 [2]中国石油新疆油田公司,新疆克拉玛依834000

出　　处：《润滑与密封》2025年第4期24-30,共7页Lubrication Engineering

基　　金：四川省自然科学基金面上项目(2022NSFSC0402);中海石油(中国)有限公司北京研究中心研发项目(CCL2020CPS0407ZSN,CCL2021RCPS0399RCN)。

摘　　要：O形橡胶密封圈结构简单,且具有自密封性能,多用于单侧受压的密封工况。然而在深水智能完井液控滑套的轴向静密封应用中,O形圈则同时承受内部控制压力与外部环境压力。为探究O形圈在双侧压力下的静密封性能,针对井下3 000 m的实际压力环境(环境压力30 MPa),利用ABAQUS有限元分析软件建立O形圈的有限元模型,分析不同压缩率下内外介质压力相等和内外介质压力存在压差时的O形圈静密封性能。结果表明:当内外压相同时,不同压缩率下O形圈主密封面上的接触应力均大于介质压力,但当压缩率大于23.81%后,Mises应力与剪切应力显著增长;当内压大于外压时,O形圈主密封面上的接触应力仍然大于介质压力,但其有效接触长度显著减小,当压缩率低于23.81%且内外压差为5 MPa时,O形圈主接触面上的有效接触长度占比不足50%,因此应选用使密封圈压缩率为23.81%的沟槽尺寸。设计一款专用实验设备,对压缩率为23.81%的O形圈进行密封性能试验,试验结果表明,该压缩率下的O形圈在承受35 MPa内压与30 MPa的外压时满足密封性能。Rubber O-ring seals have a simple structure and self-sealing performance,and are often used for sealing conditions under unilateral compression.However,in the axial static sealing application of deepwater intelligent completion hydraulic control slide sleeve,the O-ring simultaneously withstand internal control pressure and external environmental pressure.To investigate the static sealing performance of O-rings under bilateral pressure,the finite element model of theO-ringwas established using ABAQUS finite element analysis software to simulate the underground pressure environment at a depth of 3000 m(at environmental pressure of 30 MPa).The static sealing performance of the O-ring was analyzed under various compression rates,considering both equal internal and external medium pressures as well as pressure differentials between them.The results show that under the same internal and external pressure,the contact stress on the main sealing surface of the O-ring at different compression rates is greater than the medium pressure,however,when the compression rate exceeds 23.81%,Mises stress and shear stress significantly increase.When the internal pressure is greater than the external pressure,the contact stress on the main sealing surface of the O-ring is still greater than the medium pressure,but its effective contact length is significantly reduced.When the compression rate is lower than 23.81%and the difference of internal and external pressure is 5 MPa,the effective contact length on the main contact surface of the O-ring accounts for less than 50%.Therefore,a groove size with a compression rate of 23.81%for the sealing ring should be selected.A specialized experimental setup was designed to evaluate the sealing performance of the O-ring with a compression ratio of 2381%.The results demonstrate that the O-ring effectively maintains its sealing performance when subjected to an internal pressure of 35 MPa and an external pressure of 30 MPa.

关 键 词：静密封性能 O形圈 轴向密封 智能完井 双侧受压 

分 类 号：TB42[一般工业技术]