压裂双弯头液固两相流冲蚀影响数值分析  

Numerical Analysis on Erosion Effect of Liquid-Solid Two-Phase Flow in Double-elbow Used for Hydraulic Fracturing

作　　者：代四维 樊建春[1,2] 张党生 杨思齐 李杰[1,2] DAI Siwei;FAN Jianchun;ZHANG Dangsheng;YANG Siqi;LI Jie(College of Safety and Ocean Engineering,China University of Petroleum(Beijing),Beijing 102249,China;Key Laboratory of Oil and Gas Safety and Emergency Technology Ministry of Emergency Management,China University of Petroleum(Beijing),Beijing 102249,China;Downhole Operation Branch of CNPC Bohai Drilling Engineering Company Limited,Cangzhou Hebei 062552,China;State Key Laboratory for Performance and Structure Safety for Petroleum Tubular Goods and Equipment Materials,CNPC Tubular Goods Research Institute,Xi’an Shaanxi 710077,China)

机构地区：[1]中国石油大学(北京)安全与海洋工程学院,北京102249 [2]中国石油大学(北京)应急管理部油气生产安全与应急技术重点实验室,北京102249 [3]中国石油集团渤海钻探工程有限公司井下作业分公司,河北沧州062552 [4]中国石油集团工程材料研究院石油管材及装备材料服役行为与结构安全国家重点实验室,陕西西安710077

出　　处：《润滑与密封》2024年第1期9-14,共6页Lubrication Engineering

基　　金：国家自然科学基金项目(52175208)。

摘　　要：在水力压裂过程中,地面高压管汇受管内携砂压裂液的复杂流动影响,长期承受着严峻的冲蚀破坏。在各类高压管汇构件中,弯管的冲蚀损伤最为严重。为改善压裂双弯头冲蚀磨损状况,采用DPM模型、RNG k-ε湍流模型,综合分析了斯托克斯数(St)、重力方向、粒径及流速对串联双弯头冲蚀磨损的影响。结果表明:冲蚀磨损区域主要由St和重力方向共同决定;St<1时,最大冲蚀率随颗粒尺寸增大呈线性增加,St>1时呈指数增长;St相同时,速度对冲蚀磨损程度的影响远比颗粒尺寸强烈;向下流重力方向下,损伤区域随St增加完全转移至第二弯头的临界粒径显著小于向上流临界粒径;重力方向对同向冲击颗粒的冲蚀损伤虽有增强效应,其对冲蚀磨损程度影响远不及颗粒尺寸因素作用大。In the process of hydraulic fracturing,the ground high-pressure manifold is affected by the complex flow of liquid-particle two-phase fracturing fluid in the pipe,which makes it suffer severe erosion damage for a long time.Among all kinds of high-pressure manifold components,the erosion damage of elbow is the most serious.In order to improve the erosive wear of fractured double-bends,DPM model and RNG k-εturbulence model were used to comprehensively analyze the influence of Stokes numbers(St),gravity directions,particle sizes and flow velocities on the erosive wear of series double-bends.The results show that the erosion zone is mainly determined by St and gravity direction.When St is less than 1,the maximum erosion rate increases linearly with the increase of particle size.When St is more than 1,the maximum erosion rate increases exponentially.The effect of velocity on erosion rate is much larger than that of particle size when St is the same.In the gravity direction of downflow,the critical particle size of the damage region completely transferred to the second elbow with the increase of St is significantly smaller than that of the upflow.Although the gravity direction has an enhancing effect on the erosion damage of co-directional impact particles,its effect on erosive wear is far less than that of particle size.

关 键 词：高压管汇 双弯头 液固两相流 冲蚀磨损 斯托克斯数 

分 类 号：TH117.1[机械工程—机械设计及理论]