【摘要】 从岩心薄片分析着手,利用模拟退火算法重建数字岩心;从所建数字岩心中提取对等的由形状简单的孔隙和孔喉组成的孔隙级网络模型。利用表面自由能平衡得到每个网络模型组成单元的毛细管入口压力,从而确定孔隙中流体的流动过程,即所有单元按毛细管入口压力从小到大的顺序进行驱替,入口压力越小的孔隙越先被驱替。由单相和多相时流量的不同可以求出油水两相的相对渗透率,而计算结果与实验结果的一致性则证明了模型是可以用来代表真实岩样的,可以作为一个平台更深入地研究流体在多孔介质中的流动。更多还原

【Abstract】 Based on the analysis of the core slice, simulated anneal algorithm is used to reconstruct digital cores, from which an equal network model made up of pores and throats of simple shape is extracted. According to the balance of surface free energy, the entry capillary pressure of each unit in the network model is calculated, which is then used to determine the fluid flow in the pores, in other words, all the units are flooded in order according to their entry pressures - the pores with the smallest entry capillary pressure are flooded first. The oil and water relative permeability are obtained using the flow rate difference between single - phase flow and multiphase flow. The result of calculation from the model matches well with the experimental results, which shows that the constructed model can represent the true core samples, and therefore it can be used as a platform to study fluid flow in porous medium.更多还原