三气合采井下分层调控工具高速流体冲蚀研究  

High-speed Fluid Erosion of Downhole Stratification Control Tool for Combined Production of Three-phase Gas

作　　者：唐洋[1,2,3] 向上 赵鹏 王杰 王国荣[1,2,3] TANG Yang;XIANG Shang;ZHAO Peng;WANG Jie;WANG Guorong(School of Electrical and Mechanical Engineering,Southwest Petroleum University,Chengdu 610500,China;Key Laboratory of Oil and Gas Equipment of the Ministry of Education,Southwest Petroleum University,Chengdu 610500,China;National Key Laboratory of Marine Natural Gas Hydrates,Beijing 102209,China;Research Institute of Drilling and Mining Technology of China National Petroleum Group Chuanqing Drilling Engineering Limited Company,Sichuan Deyang 618000,China)

机构地区：[1]西南石油大学机电工程学院 [2]西南石油大学石油天然气装备教育部重点实验室,成都610500 [3]海洋天然气水合物全国重点实验室,北京102209 [4]中国石油集团川庆钻探工程有限公司钻采工程技术研究院,四川德阳618000

出　　处：《表面技术》2024年第19期93-106,共14页Surface Technology

基　　金：国家重点研发计划项目(2021YFC2800903);中国博士后科学基金资助项目(2020M683359);深水钻井工程四川省自然科学基金创新研究群体(2023NSFSC1980);国家自然科学基金资助项目(52004235)。

摘　　要：目的针对三气合采复杂工况导致井下分层调控工具易冲蚀失效的问题,开展高速气固混合流体对该工具冲蚀规律研究,以获得其最优结构设计参数。方法通过计算流体力学的方法建立了井下分层调控工具的三维冲蚀模型,并采用离散相模型描述了固相颗粒的运动轨迹。通过数值模拟分析,得到了井下分层调控工具的易冲蚀区域,并通过实验验证了不同结构参数和产量下的冲蚀破坏机理。结果冲蚀磨损区域主要分布在笼套段底部、节流孔及其内壁面、笼套段与固定油嘴的过渡段、固定油嘴入口端、固定油嘴内壁面。随着固定油嘴入口角度增大,固定油嘴内壁面最大冲蚀率变化不大,过渡段和固定油嘴入口端最大冲蚀率先增大后减小再增大。随着笼套底部半径增大,笼套段底部最大冲蚀率处于较低水平且无明显变化,但节流孔及其内壁面最大冲蚀率逐渐增大。随着笼套式阀芯开度增大,节流孔及内壁面最大冲蚀率处于较低水平且无明显变化,过渡段及油嘴入口端最大冲蚀率在阀芯开度为60%时取得最大值。随着固相颗粒粒径以及质量流量的增大,节流孔及内壁面、过渡段和固定油嘴入口端最大冲蚀率呈增大趋势,笼套段底部和固定油嘴内壁面最大冲蚀率较低且无明显变化。结论本研究结果揭示了高速高压气固两相流对两级节流结构的冲蚀破坏机理,在设计同类井下工具时,可选择固定油嘴进口角为25°~30°,笼套底部半径为25~30 mm,阀芯开度小于50%或大于70%。During the extraction process of three-phase natural gas hydrates,downhole layer control tools are prone to erosion from solid particles like sludge and rock fragments carried by high-speed and high-pressure gas.To enhance the lifespan of these tools and reduce erosion,it is crucial to analyze susceptible areas for erosion and improve their structural design.The computational fluid dynamics was employed to establish a three-dimensional erosion model of downhole layer control tools and a discrete phase model was adopted to depict the trajectories of solid particles.Numerical simulations were conducted to investigate the primary erosion-wear zones in these tools,including the bottom section of the casing,orifice holes and their inner walls,the transition section between the casing segment and the fixed oil nozzle,the inlet of the fixed oil nozzle,and its internal wall.Moreover,the effects of various structural parameters(such as inlet structure of the fixed oil nozzle,different bottom radii of the casing,and valve core opening)and production parameters(particle size,mass flow rate of solid particles)on the erosion rate of downhole layer control tools were studied.The study findings indicated that as the inlet angle of the fixed oil nozzle increased,the maximum erosion rate on the internal wall surface remained relatively stable,while the maximum erosion rate at the transition section and the inlet end of the nozzle firstly increased,then decreased,and subsequently increased again.Analysis suggested that an inlet angle of 35°yielded optimal results.With an increase in the bottom radius of the casing,the maximum erosion rate at the bottom section of the casing remained relatively low,but the erosion rate at the orifice holes and their inner walls gradually increased,resulting in a higher erosion rate at the bottom section of the casing.Analysis suggested that a casing bottom radius between 25 mm and 30 mm provided increased erosion resistance for downhole layer control tools.As the valve core opening increased,the m

关 键 词：三气合采 井下分层调控工具 冲蚀失效机理 数值分析 计算流体力学 天然气水合物 

分 类 号：TH117[机械工程—机械设计及理论]