文23储气库注采管柱封隔器密封数值模拟研究  

Numerical Simulation Study on Packer Sealing of Injection-production String in Wen 23 Gas Storage

作　　者：何祖清[1] 伊伟锴[1] 李军[2,3] 孙鹏 蒋记伟[2] 刘鹏林[2] HE Zuqing;YI Weikai;LI Jun;SUN Peng;JIANG Jiwei;LIU Penglin(Sinopec Research Institute of Petroleum Engineering,Beijing 100101,China;School of Petroleum Engineering,China University of Petroleum(Beijing),Beijing 102249,China;School of Petroleum,China University of Petroleum(Beijing)at Karamay,Karamay,Xinjiang 834000,China)

机构地区：[1]中国石化石油工程技术研究院,北京朝阳100101 [2]中国石油大学(北京)石油工程学院,北京102249 [3]中国石油大学(北京)克拉玛依校区石油学院,新疆克拉玛依834000

出　　处：《石油管材与仪器》2020年第6期47-51,共5页Petroleum Tubular Goods & Instruments

基　　金：中国石化重点科技攻关项目“中原文23储气库注采工艺关键技术”(项目编号:P18098-2);国家自然科学基金-企业创新发展联合基金课题“海相深层油气富集机理与关键工程技术基础研究-构造应力集中区页岩气井套管载荷模型及结构完整性失效机理”(项目编号:U19B6003-05-04-02)。

摘　　要：针对文23储气库注采管柱结构,基于非线性接触理论,建立了封隔器中心管-胶筒-油层套管密封结构三维有限元模型,模拟多周次注采情况下封隔器的密封性能。研究结果表明:随着胶筒高度的增加、套管内径和胶筒摩擦系数的减小,胶筒与油层套管之间的接触应力增大,轴向压缩距减小,密封系数增大;采用高度较大、摩擦系数较小的胶筒及内径较小的套管有利于封隔器与油层套管的密封;注采周次越多,封隔器胶筒中部的接触应力和密封系数越低,封隔器密封失效风险越大。基于此,建议文23储气库提前做好封隔器失效预防方案。Based on the non-linear contact theory,a three-dimensional finite element model of the packer′s central tube-rubber-production casing seal structure was established for the injection and production pipe structure of Wen 23 gas storage,and the sealing performance of the packer was simulated under the condition of multi-cycle injection and production.The results show that with the increase of the rubber height,and the decrease of the inner casing diameter and the rubber friction coefficient,the contact stress between the rubber and the production casing increases,the axial compression distance decreases,and the sealing coefficient increases.The use of rubber with higher height and smaller friction coefficient and casing with small inner diameter is beneficial to the sealing of the packer and production casing.The more the injection and production cycle,the lower the contact stress and sealing coefficient in the middle of the packer rubber,and the greater the failure risk.Therefore,it is recommended that a failure prevention plan on packer of Wen 23 gas storage should be made in advance.

关 键 词：文23储气库 封隔器 多周次 接触应力 密封系数 数值模拟 

分 类 号：TE972.2[石油与天然气工程—石油机械设备]