连续管反循环冲砂过程的磨损研究  

Study on Abrasion of Coiled Tubing for Reverse Circulation Sand Washing

作　　者：赵签[1] 黄宏彬 王一全 张永学[2] 张金亚[2] Zhao Qian;Huang Hongbin;Wang Yiquan;Zhang Yongxue;Zhang Jinya(PetroChina Xinjiang Oilfield Company;College of Mechanical and Transportation Engineering,China University of Petroleum(Beijing))

机构地区：[1]新疆油田公司,新疆克拉玛依市834000 [2]中国石油大学(北京)机械与储运工程学院

出　　处：《石油机械》2020年第9期107-113,共7页China Petroleum Machinery

基　　金：“十三五”国家油气重大专项“大型油气田及煤层气开发”之子课题“深层连续管作业与增产改造施工技术”(2016ZX05023-006-003-001)、深层连续管作业与增产改造先导实验(2016ZX05023-006-003-002)。

摘　　要：针对连续管反循环冲砂解堵过程中颗粒对管壁造成的磨损问题,采用欧拉-欧拉两相流模型,选择了新的磨损模型并自编对应的用户自定义函数(UDF)接口程序,对水平井斜井段两相流进行了数值计算,研究了不同颗粒体积分数、流体流速、颗粒大小及流体黏性时液固两相流对壁面磨损的影响规律。研究结果表明:高颗粒体积分数下的磨损机理为以磨蚀为主,冲蚀为辅;磨损主要发生在连续管内的外曲率半径处,且无论两相流的流速、颗粒体积分数、颗粒大小及流体性质如何,最大磨损率均发生在斜井段入口附近;流体排量越大,磨损越严重,当排量从200 L/min增加到600 L/min时,最大磨损率从6.06×10^-11m/s增加到2.15×10^-10m/s。所得结果可为减轻连续管磨损及预测连续管寿命提供理论支持。To address the abrasion on the pipe wall caused by high particle volume fraction fluid during reverse circulation sand washing using coiled tubing,the Euler-Euler two-phase flow model is adopted,a new wear model is selected and the corresponding user-defined function(UDF)interface program is compiled to numerically calculate the two-phase flow in the inclined section of a horizontal well.The influence of liquid-solid two-phase flow on wall abrasion under different particle volume fractions,particle sizes and fluid viscosity are studied.The study results show that the wear mechanism under high particle volume fraction is mainly abrasion,and erosion is the auxiliary.Wear mainly occurs at the outer radius of curvature in the coiled tubing.Regardless of the flow rate,particle volume fraction,particle size and fluid property,the maximum wear rate occurs near the entrance of the inclined well section.The larger the fluid displacement,the more severe the wear.When the displacement increases from200 L/min to 600 L/min,the maximum wear rate increases from 6.06×10^-11 m/s to 2.15×10^-10 m/s.The study results can provide theoretical support for reducing coiled tubing wear and predicting coiled tubing life.

关 键 词：连续管 反循环冲砂 欧拉-欧拉两相流模型 磨损率 磨蚀 冲蚀 

分 类 号：TE934[石油与天然气工程—石油机械设备]