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应用逾渗理论,基于计算机随机建模方法,建立了水湿储层三维网络模型.模型的孔隙喉道半径采用截断式威布尔分布随机产生,通过与实际岩心相渗曲线的拟合,验证了模型的有效性.计算了形状因子、孔隙度、导流率等参数,为模拟过程提供基础数据.应用建立的网络模型,模拟了饱和油和水驱油两个驱替过程,分析了孔隙特性参数对相对渗透率及驱替效率的影响.结果表明:随着孔喉比的降低、配位数的增加、形状因子的增加(在一定范围内),水相渗透率降低,油相渗透率升高,残余油饱和度降低,驱替效率增大.与其他理想模型相比,模型可以更真实地研究油水两相流动特征.
Based on the percolation theory, a three-dimensional network model of water wet reservoirs was established based on computer stochastic modeling method.The pore throat radii of the model were randomly generated by the truncated Weibull distribution.The fitting with the actual core infiltration curve proved that The validity of the model is discussed.The parameters such as shape factor, porosity, conductivity and so on are calculated to provide the basic data for the simulation process.Using the established network model, the two displacement processes of saturated oil and water flooding are simulated, and the pore characteristics Parameters on relative permeability and displacement efficiency.The results show that with the decrease of pore throat ratio, the increase of coordination number, the increase of shape factor (within a certain range), the decrease of water phase permeability, the increase of oil phase permeability The residual oil saturation decreases and the displacement efficiency increases.Compared with other ideal models, the model can more truly study the oil-water two-phase flow characteristics.