摘要
建立了油水两相流三维网络模拟模型。在水湿、油湿、中性3种储层条件下,通过微观模拟分别讨论了孔隙半径、孔喉比、形状因子、配位数等储层微观参数对剩余油分布规律的影响。研究结果表明:对于油湿和中性储层,孔隙半径、配位数愈小,形状因子愈大,孔隙中存在剩余油概率愈大;对于水湿性储层,孔隙半径增大,形状因子减小,产生剩余油的概率反而增加。具有合适配位数的孔隙,驱油效率较高,较大或较小配位数情况下孔隙中都容易产生剩余油。无论是水湿、油湿还是中性储层,随着孔喉比的增大,总体上孔隙中存在剩余油的概率加大。
A three-dimensional network model for oil-water two-phase flow was proposed. The influences of pore radius, pore-throat ratio, shaping factor and coordination number on distribution of remaining oil in the oil-wet, water-wet and middle-wet reservoirs were investigated by means of microscopic simulation. The results show that the probability for generating remaining oil in oil-wet or middle-wet reservoirs would be larger as the pore radius and coordination number get smaller or the shaping factor becomes larger. The same was for the wate-wet reservoirs as the pore radius becomes larger or the shaping factor becomes smaller. The pores with suitable coordination number will lead to high sweep efficiency. Also remaining oil can be generated easily in the pores with a large or small coordination number. In general, the probability for generating remaining oil in water-wet,oil wet reservoirs and middle-wet reservoirs will become larger as the pore-throat ratio increases.
出处
《石油学报》
EI
CAS
CSCD
北大核心
2005年第6期69-73,共5页
Acta Petrolei Sinica
基金
国家自然科学基金资助项目(No.10302021)"聚合物驱微观渗流机理及剩余油启动临界参数研究"部分成果
关键词
剩余油分布
三维网络模型
润湿性
储层参数
微观模拟
remaining oil distribution
three-dimension network model
wettability
reservoir parameter
microscopic simulation
