【作者】 肖易航； 郑军； 何勇明； 刘鑫；

【Author】 Xiao Yihang;Zheng Jun;He Yongming;Liu Xin;College of Energy, Chengdu University of Technology;

【机构】 成都理工大学能源学院；

【摘要】 以均匀润湿理论为基础的渗流理论模型无法模拟混合润湿体系渗流规律。基于圆柱形毛细管束及3R建模理论,通过Young-Laplace方程及传导率方程,推导出大孔油湿(MWL)、小孔油湿(MWS)及分数润湿(FW)体系的毛细管压力与相对渗透率模型,研究油湿比例因子对渗流规律的影响,并对三种混润湿体系渗流规律进行对比。结果表明:均匀水湿与均匀油湿体系分别具备排驱与自吸特征,混合润湿体系同时具有两种特征;MWL与MWS分别在油相驱替水相过程的末期与初期,与均匀水湿与均匀油湿体系具备相同的渗流特征,且随着油湿比例因子的增加,该阶段的饱和度范围分别减小与增大;驱油效果与油湿比例因子呈反比,油湿比例因子对不同混合润湿体系含水率曲线影响不同;MWS油相自吸能力较MWL强,且油相易进入水湿孔隙,MWL与MWS分别具有更大的油相与水相流动能力,MWL驱油效果好于MWS,FW均介于二者之间。更多还原

【Abstract】 The percolation laws of mixed-wet systems can not be simulated by the homogeneous-wet theories. In order to study the effect of oil-wet scaling factor in the percolation laws of mixed-wet systems, and show the differences for MWL, MWS and FW, capillary pressure models and relative permeability models of three mixedwet systems are derived based bundle of capillary tubes model and 3R modelling theory under Young-Laplace equation and conductivity equation. The results show: capillary pressure curves of the homogeneous water-wet and homogeneous oil-wet system respectively has the characteristics of drainage and imbibition, while mixed-wet systems have two characteristics at the same time. MWL and MWS share the same characteristics with homogeneous water-wet and homogeneous oil-wet systems at the last and early stage of oil driving water respectively, and saturation range of the phenomenon decreases and increases with increasing oil-wet scaling factor. The flooding effect and oil-wet scaling factor are inverse ratio, and the effects of oil-wet scaling factor on water cut for different mixed-wet systems are different. The capacity of spontaneous imbibition for MWS is better than MWL, and oil easily accesses homogeneous water-wet pores for MWS, MWL and MWS have higher flow capacity of oil and water respectively, the flooding effect of MWL is better than MWS, FW is between them.更多还原