摘要
针对目前现场模拟火烧油层中网格划分尺度相对于燃烧前缘过大的局限性,将燃烧模型分为三个独立区域,基于充分大而有限的燃烧反应活化能假设,应用移动坐标系和奇异摄动法导出了燃烧温度和燃烧波前锋速度近似解,并在岩心尺度模型上与有限差分数值解进行了对比。结果表明,注气速度对火烧油层正向燃烧的燃烧动态影响很大;岩心尺度下奇异摄动解与有限差分数值解相一致,说明奇异摄动法求解火烧油层前缘问题可行。
At present, grid division scale is larger than combustion fronts in numerical simulation of in-situ combustion. To improve this limitation, combustion model is divided into three absolute zones. Simultaneously based on the hypothesis, combustion reaction activation energy is large enough and limited, approximations of combustion temperature and combustion waves＇ traveling velocity are educed by moving coordinates and singularity perturbation approach. Those solutions are compared to finite difference numerical solutions in the core scale model. Results indicate that the effect of air injection rate on combustion dynamics of forward combustion is large. Moreover singularity perturbation solutions are close to finite difference numerical solutions on core scale model, and the singular perturbation approach solving the fronts propagation of in-situ combustion is feasible.
出处
《系统仿真学报》
CAS
CSCD
北大核心
2009年第22期7026-7028,7032,共4页
Journal of System Simulation
基金
中石化集团公司重点科研项目(p06040)
关键词
火烧油层
多孔介质
数学模型
移动坐标
奇异摄动
in-situ combustion
porous media
mathematical model
moving coordinates
singular perturbed
