低渗透裂缝油藏渗吸法采油数值模拟理论研究

根据低渗透裂缝油藏渗吸法采油渗流机理，建立了双孔双渗渗吸法采油数学模型，并给出了数值解法和流动系数的取值方法。通过实例验证。该方法计算的含水率指标与矿场实际值符合程度较高。在此基础上，定量分析了渗吸法采油的主要影响因素，结论是：裂缝与基质渗透率比大于100，裂缝密度大于0.030条/m，油水粘度比小于15，毛管力较大的水湿油藏适合渗吸法采油，能够提高水驱采收率1％以上。

Numerical simulation of imbibition oil recovery for low permeability fractured reservoir

Based on mechanism of imbibition oil recovery in low permeability fractured reservoir, a mathematical model of dual porosity and dual-permibility imbibition oil recovery is established, and numerical solution method and the acquiring-value method of flow coefficient are presented. Through the verification of practical example, the corresponding water-cut index, which is calculated by this method, meets the practical value of field site satisfactorily. On the basis of it, the main influential factors of imbibition oil recovery are quantitatively analyzed. The conclusion is that: those hydrophilic reservoirs, of which the permeability ratio of fractures to matrix is more than 100, the fracture density is more than 0.030 item per meter and the viscosity ratio of oil to water is less than 15 and the capillary force is greater, is suitable for imbibition oil recovery, and imbibition oil recovery can enhance waterflooding recovery ratio more than 1%.