连续管防喷盒胶筒摩擦机理及过管稳定性分析  

Analysis on Friction Mechanism and Crossing Stability of Coiled Tubing Stripper

作　　者：郑翔 陈婷[2] 曾永锋 朱再思 邓琳 李伟 郭伟 Zheng Xiang;Chen Ting;Zeng Yongfeng;Zhu Zaisi;Deng Lin;Li Wei;Guo Wei(Jianghan Machinery Research Institute Limited Company of CNPC;School of Mechanical Engineering,Yangtze University;Sinopec Engineering Incorporation)

机构地区：[1]中石油江汉机械研究所有限公司 [2]长江大学机械工程学院 [3]中国石化工程建设有限公司

出　　处：《石油机械》2023年第11期87-94,共8页China Petroleum Machinery

基　　金：中国石油天然气股份有限公司科学研究与技术开发项目“连续管采油作业一体化技术现场试验”(2020F-48)。

摘　　要：为了降低连续管过防喷盒的摩擦力和注入井内时连续管径向无支撑段的失稳风险,对连续管过防喷盒摩擦行为及其稳定性进行研究。采用试验方法对防喷盒胶筒进行了微观摩擦磨损分析,同时采用有限元与二次开发相结合的方法,建立了连续管过防喷盒的有限元模型及摩擦力计算程序,并分析了连续管运动状态、摩擦因数和井筒介质压力等因素对连续管过防喷盒的摩擦力及其稳定性的影响规律;依据连续管注入井内时连续管的轴向力计算模型,采用压杆稳定理论,计算不同摩擦因数和井筒介质压力时连续管无支撑段最大允许长度。研究结果表明:磨粒磨损是胶筒的主要失效形式,摩擦力的主要来源为机械作用力;井筒介质压力增大,摩擦力增大,连续管无支撑段最大允许长度值减小,其最大允许长度值应小于0.46 m。所得结论可为优化作业参数和计算连续管无支撑段最大允许长度提供理论基础。In order to reduce the friction of coiled tubing crossing rubber cylinder and the destabilizing risk of coiled tubing in radial unsupported section at running in,the friction behavior and stability of coiled tubing crossing rubber cylinder were studied.First,a microscopic frictional wear analysis was conducted on the stripper using test methods,simultaneously,a finite element model and a friction calculation program for coiled tubing crossing rubber cylinder were established using a finite element and secondary development combination method,and the influence of factors such as coiled tubing motion state,friction factor and wellbore medium pressure on the friction and stability of coiled tubing crossing rubber cylinder was analyzed;second,based on the axial force calculation model of coiled tubing at running in,the maximum allowable length of unsupported section of the coiled tubing under different friction factors and wellbore medium pressures was calculated using the pressure bar stability theory.The study results show that abrasive wear is the main failure form of the stripper,and the main source of friction is mechanical force;as wellbore medium pressure increases,the friction increases,and the maximum allowable length of the unsupported section of coiled tubing decreases,which should be less than 0.46 m.The conclusions provide a theoretical basis for optimizing operation parameters and calculating the maximum allowable length of the unsupported section of coiled tubing.

关 键 词：连续管 防喷盒 胶筒 摩擦力 稳定性 

分 类 号：TE935[石油与天然气工程—石油机械设备]