摘要
针对地下储气库井口采气树在强注强采工况下所面临的气液固三相流冲蚀磨损问题,采用ANSYS Fluent软件建立三维数值模型,结合Mixture多相流模型、离散相模型(Discrete Phase Model,DPM)与RNG k-ε湍流模型,系统模拟了采气速率、颗粒粒径、颗粒质量流量、井口压力及液气比等因素对冲蚀速率的影响。结果表明:冲蚀热点位于上游与下游直管段连接处外壁;采气速率上升显著加剧冲蚀;粒径变化影响冲蚀形态,小粒径形成细长冲蚀带,大粒径造成宽短冲蚀坑;颗粒质量流量增大加剧磨损;井口压力升高会增强湍流并扩大冲蚀范围;当液气比>0.1 m^(3)/104 m^(3)时,液相润滑作用减弱,冲蚀区域趋于集中。研究揭示了储气库井口通道的冲蚀机制与关键影响因素,为其安全运行阈值设定与防护设计提供了理论支撑。
This paper focuses on the erosion and wear problem of the gas production tree at the wellhead of underground gas storage facilities under the strong injection and strong production conditions.A three-dimensional numerical model was established using ANSYS Fluent,combined with the Mixture multiphase flow model,DPM discrete phase model and RNG k-εturbulence model,to systematically simulate the influence of gas production rate,particle size,particle mass flow rate,wellhead pressure and gas-liquid ratio on the erosion rate.The results show that the erosion hotspots are located on the outer wall at the connection between the upstream and downstream straight pipe sections;An increase in the gas production rate significantly intensifies the erosion;Changes in particle size affect the erosion morphology,with small particle sizes forming long and thin erosion bands and large particle sizes causing wide and short erosion pits;An increase in the particle mass flow rate intensifies the wear;An increase in wellhead pressure enhances turbulence and expands the erosion range;When the gas-liquid ratio is greater than 0.1 m^(3)/10^(4) m^(3),the lubricating effect of the liquid phase weakens and the erosion area tends to concentrate.The study reveals the erosion mechanism and key influencing factors of the wellhead channel of the gas storage facility,providing theoretical support for setting the safety operation threshold and protective design.
作者
赵宇曈
高翔
Zhao Yutong;Gao Xiang(School of Petroleum and Natural Gas Engineering,Liaoning Petrochemical University,Fushun 113005,China;CNPC Engineering Technology R&D Company Limited,Beijing 102206,China)
出处
《当代化工研究》
2025年第19期35-37,共3页
Modern Chemical Research
关键词
储气库
采气树
CFD
储气库出砂
冲蚀
冲蚀速率
gas storage reservoir
gas production tree
CFD
sand production from the gas storage reservoir
erosion
erosion rate
