摘要
采用天然低渗透砂岩微观模型,通过与实际地质状况较为相似条件下的油驱水实验,模拟石油在低渗透砂岩孔隙内的渗流,分析和探讨了低渗透砂岩孔隙介质中石油的微观渗流机理。研究结果表明,石油在低渗透砂岩中渗流路径曲折复杂,运移渗流模式有稳定式、指进式和优势式3种;石油在低渗透砂岩中渗流存在启动压力梯度,启动压力梯度与砂岩孔隙度关系复杂,而与砂岩渗透率有很好的相关性;石油的渗流速度与驱替压力呈很好的相关性,石油以相同速度在不同渗透率级别的砂岩内渗流时所需要的驱替压力随砂岩渗透率的增大而降低。
By using natural sandstone microscopic model and the water-drive-oil experiment under the condition of similarly real geologic situation,the crude oil flowing through porous media in low permeability sandstone is simulated.The flow course and characteristics of crude oil in pores and throats are observed.The micro-mechanism of oil flowing through porous media in low permeability sandstone is analyzed and discussed.The result shows that the flow pathway is complicated and the flow patterns appear three types,they are stable,fingering and preferable ones.The relationship between threshold pressure gradient and sandstone porosity is complicated when oil flows in low permeability sandstone,but there is a good relationship between the gradient and the permeability,and also,there is a good relationship between crude oil flowing velocity and displacing pressure,when flowing in different permeability sandstones at same velocity,oil displacing pressure will decrease as the permeability increases.
出处
《西南石油大学学报（自然科学版）》
CAS
CSCD
北大核心
2010年第1期16-20,共5页
Journal of Southwest Petroleum University(Science & Technology Edition)
基金
国家自然科学基金项目(40772088)
关键词
低渗透砂岩
运移
渗流模式
启动压力梯度
模拟实验
low permeability sandstone
migration
pattern flowing through porous media
threshold pressure gradient
simulation experiment
