摘要
建立了在单相低速非达西渗流条件下反求低渗透油藏参数的敏感系数公式 ,给出了各类非均质油藏条件下压力关于渗透率和孔隙度的数值计算结果· 认识到井底压力对井底附近的渗透率更敏感 ,启动压力梯度的存在 ,使生产井附近区域敏感系数变大· 观测井敏感系数在两井连线区域受启动压力梯度影响很大·
Theoretical equations for computing sensitivity coefficients of wellbore pressures to estimate the reservoir parameters in low_permeability reservoirs conditioning to non_Darcy flow data at low velocity were obtained. It is shown by a lot of numerical calculations that the wellbore pressures are much more sensitive to permeability very near the well than to permeability a few gridboocks away from the well. When an initial pressure gradient existant sensitivity coefficents in the region are closer to the active well than to the observation well. Sensitivity coefficients of observation well at the line between the active well and the observation well are influenced greatly by the initial pressure gradient.
出处
《应用数学和力学》
CSCD
北大核心
2002年第6期635-642,共8页
Applied Mathematics and Mechanics
基金
国家自然科学基金资助项目 (10 172 0 6 1)
关键词
非达西渗流
渗透率
孔隙度
敏感系数
反问题
低渗透油藏
non_Darcy flow through porous media
permeability
porosity
sensitivity coefficient
inverse problem
low_permeability reservoir
