超膨胀波纹骨架封隔器结构设计与密封特性研究  

Structural design and sealing characteristics of super-expansion corrugated framework packer

作　　者：张政 毕绍东 郭岩宝[1] 王德国[1] ZHANG Zheng;BI Shaodong;GUO Yanbao;WANG Deguo(College of Mechanical and Transportation Engineering,China University of Petroleum-Beijing,Beijing 102249,China)

机构地区：[1]中国石油大学(北京)机械与储运工程学院,北京102249

出　　处：《石油科学通报》2025年第1期169-177,共9页Petroleum Science Bulletin

基　　金：中国石油大学(北京)科研基金资助(2462023SZBH008)。

摘　　要：储气库是国家战略储备、应急调峰、保障能源安全的重要基础设施。但复杂的注采工艺和频繁的压力波动对安全生产构成严峻挑战。过油管封隔器作为过油管作业关键井下装备,具有高效、低风险及操作简便等优势,因而在不动管柱暂堵、验封领域表现出巨大应用潜力。然而,传统叠层钢片式结构的过油管封隔器无法满足储气库用过4-1/2油管密封7寸套管的超膨胀密封的现场需求,亟需解决过小内径油管封大内径套管的问题,同时兼顾胶筒密封性能和强度要求。本文创新性提出一种新型波纹骨架过油管封隔器设计方案,确定了波纹骨架、三胶筒结构及关键部件的尺寸参数及材料选型,通过建立封隔器坐封力学模型,阐明了坐封机理,明确了井下作业的有效坐封条件;选用三阶Ogden模型对聚氨酯胶筒进行超弹本构分析,并利用ABAQUS有限元仿真软件模拟了封隔器的超膨胀过程,结果表明可以在30 s内实现整体完全超膨胀,验证了超膨胀行为的可行性;在此基础上,进一步优化了超膨胀波纹骨架封隔器波纹骨架和密封胶筒几何尺寸参数,模拟结果表明:当波纹骨架的型面表达式为y=3sin1.5x,外胶筒外径为84mm时,封隔器整体应力变化平缓,坐封性能良好,可有效减少应力集中,提升密封性能和坐封效果。该超膨胀波纹骨架封隔器可满足储气库复杂工况的承压需求,降低密封胶筒应力集中,延长工具使用寿命,为储气库用超膨胀过油管封隔器的设计提供了理论支持与设计参考。Gas storage reservoirs are crucial infrastructures for strategic reserves,emergency peak regulation,and safeguarding national energy security.However,the complex injection and production processes and frequent pressure fluctuations pose severe challenges to safe production.The through-tubing retrievable packer,as a key downhole equipment for through-tubing operations,has the advantages of high efficiency,low risk,and simple operation.It shows the great application potentialities in the fields of temporary plugging and seal verification of immobile pipe strings.However,the through-tubing packer with the traditional laminated steel sheet structure cannot meet the on-site requirements for the super-expansion sealing of using 4-1/2 tubing to seal the 7-inch casing in gas storage reservoirs.It is urgent to solve the problem of sealing a large-diameter casing with a small-diameter tubing while taking into account the sealing performance and strength requirements of the rubber element.Here,this paper innovatively put forward a design scheme for a new corrugated-skeleton through-tubing retrievable packer.It determined the size parameters and material selection of the corrugated skeleton,three-rubber-element structure and other key components.By establishing the setting mechanical models of through-tubing packer,the setting mechanism was elucidated and the effective setting conditions for downhole operations were defined.The 3rd-order Ogden model was selected to conduct a hyperelastic constitutive analysis on the polyurethane rubber element,and the ABAQUS finite element simulation software was adopted to simulate the super-expansion process of the packer.The results indicated that the overall complete super expansion could be achieved within 30 seconds,verifying the feasibility of the super expansion behavior.On this basis,the geometric size parameters of the corrugated skeleton and sealing rubber element of the super-expansion corrugated-skeleton through-tubing retrievable packer were further optimized.The simulation res

关 键 词：超膨胀封隔器 波纹骨架 结构设计 胶筒性能 模拟仿真 

分 类 号：TE931[石油与天然气工程—石油机械设备] TH122[机械工程—机械设计及理论]