热力耦合下封隔器锚固失效及影响因素分析  

Analysis on Anchoring Failure and Influential Factors of Packer Under Thermal-Mechanical Coupling

作　　者：刘怀亮 刘献博 席岩 刘宇 李军 连威 Liu Huailiang;Liu Xianbo;Xi Yan;Liu Yu;Li Jun;Lian Wei(Beijing Huamei Century International Technology Co.,Ltd.;China University of Petroleum(Beijing);Beijing University of Technology;China University of Petroleum(Beijing)at Karamay)

机构地区：[1]北京华美世纪国际技术有限公司 [2]中国石油大学(北京) [3]北京工业大学 [4]中国石油大学(北京)克拉玛依校区

出　　处：《石油机械》2023年第12期17-24,37,共9页China Petroleum Machinery

基　　金：国家自然科学基金青年基金项目“页岩气井多级压裂诱发断层滑移量化计算模型与套管变形控制方法研究”(52204018);国家自然科学基金联合基金集成项目“复杂环境下水泥环全生命周期密封理论与控制方法”(U22B6003);国家自然科学基金联合基金重点支持项目“四川盆地深层超深层气井环空带压预防与管控基础研究”(U22A20164);中国石油天然气集团有限公司科学研究与技术开发项目“200℃/105 MPa抗硫井下安全阀及封隔器研制”(2021ZG11);中国石油大学(北京)克拉玛依校区引进人才基金项目“页岩油气井全生命周期井筒完整性分析与优化体系构建”(XQZX20220019)。

摘　　要：在深井、超深井中,高温、高压的恶劣环境对封隔器的工作性能提出了更高要求。为此,基于能量守恒定律,考虑井筒-地层径向的温度传递过程,建立了井筒温度分布的理论计算模型;基于卡瓦有限元计算模型,明确了封隔器卡-套接触压力分布特征。分析结果表明:不同卡瓦牙齿与套管的接触压力存在明显的不均匀性;卡瓦倾角与卡瓦锥角是完井封隔器卡瓦结构设计的关键几何参数,卡瓦倾角对卡-套接触压力峰值影响变化幅值仅为1.65%,不同卡瓦倾角下卡瓦1~4号齿的卡-套接触压力变化幅值却高达22%,不同卡瓦锥角下卡-套接触压力峰值变化幅值高达27%,但卡瓦1~4号齿上的卡-套接触压力变化仅有8.5%。所得结论可为完井封隔器锚固系统设计提供理论参考。In deep and ultra deep wells,the harsh environment of high temperature and pressure has put forward higher requirements for the working performance of packers.Therefore,based on the law of energy conservation,considering the radial temperature transfer process between wellbore and formation,a theoretical calculation model for wellbore temperature distribution was built;based on the slip finite element calculation model,the packer slip-casing contact pressure distribution characteristics were clarified.The analysis results show that there is a significant nonuniformity in the contact pressure between different slip teeth and the casing;the slip inclination angle and slip cone angle are key geometric parameters for the structural design of well completion packer slips,the influence change amplitude of slip inclination angle on the slip-casing contact pressure peak is only 1.65%,but the slip-casing contact pressure change amplitude of No.1 to No.4 teeth under different slip inclination angles is as high as 22%;the slip-casing contact pressure peak change amplitude under different slip cone angles is as high as 27%,but the slip-casing contact pressure change amplitude of No.1 to No.4 teeth is only 8.5%.The conclusions provide theoretical reference for the design of anchoring system of the well completion packer.

关 键 词：完井封隔器 热力耦合 计算模型 锚固系统 卡-套接触压力 卡瓦几何参数 

分 类 号：TE931[石油与天然气工程—石油机械设备]