特大井喷H_2S扩散的数值模拟分析  

Numerical simulation analysis of H_2S diffusion in a catastrophic gas blowout accident:A case study of Kai County in Chongqing

作　　者：练章华[1] 周兆明[1] 王辉[2] 李孝军[1] 林铁军[1] 

机构地区：[1]"油气藏地质及开发工程"国家重点实验室.西南石油大学 [2]中国石油吉林油田公司修井作业分公司

出　　处：《天然气工业》2009年第11期112-115,共4页Natural Gas Industry

基　　金：国家自然科学基金项目(编号:50774063)的资助

摘　　要：含H2S气体的高压井喷是一个非常复杂的扩散问题,涉及多组分气体的混合、运移、扩散、气象条件以及复杂的地形空间影响。为此,采用可行的计算流体动力学(CFD)对这一复杂的大空间流场问题进行了数值模拟研究,根据重庆开县特大井喷事故现场三维地貌等高线数据建立了井喷H2S扩散的CFD流场计算的有限元模型,结合当时气象条件,用Fluent软件的UDF功能编写了边界间歇风速的函数,数学模型中采用了适合于预测大气流动的大涡模拟运动方程,将CFD有限元模型和建立的数学模型用Fluent软件的解算器,对H2S气体的扩散和运移规律进行了详细的数值模拟研究,获得了H2S气体在该井场周围山谷地形的积聚、运移规律以及风向对气云扩散的影响,获得了H2S和CH4两种气体扩散的时空分布云图。模拟结果和事故现场调查结果一致。The high-pressure blowout with H2S is a complex problem of diffusion,involving gas mixture,gas movement,dispersion,and the influences by the meterological condition and complex topography.Therefore,a numerical simulation was carried out on the study of large-space flow field by the viable computational fluids dynamics(CFD).A finite element method was built up on the CFD flow field by the H2S diffusion of a gas blowout according to the 3D topographic contour data of this serious gas blowout occurred in Kai County of Chongqing.Then based on the meterological condition when this accident happened,a function of boundary intermittent wind speed was written with the function of UDF in the ANSYS-Fluent software,a motion equation of Large Eddy Simulation adaptable to air flow forecast was used in the mathematical model,and the CFD finite element method and the mathematical model were input to the Fluent-CFD software calculator to simulate the laws of H2S diffusion and movement.The results from simulation were shown as follows:(1)How the H2S gas is gathering and moving around,and how the gas cloud is influenced by wind direction around this well field in the valley area;(2)Time-space distribution plots of H2S and CH4 diffusion were obtained.These simulation results agree well with the field investigation data,providing theoretical basis for accident investigation,victim evacuation and risk evaluation.

关 键 词：井喷H2S CH4 CFD扩散 数值模拟 开县 

分 类 号：TE28[石油与天然气工程—油气井工程]