Abstract: The fluid flow properties and mechanism of fluid flow in low-permeability reservoir with fractured sandstones are complicated.The spontaneous imbibition of water is very important for oil recovery.The influencing factors on spontaneous imbibition include rock size,rock properties,fluid properties,wettability,initial oil saturation and boundary condition,etc.The affecting degrees of those factors were investigated by the spontaneous imbibition experiment in laboratory,NMR technology and displacement test.The study results may provide some theoretical bases for oil development of low-permeability reservoir with fractured sandstone.

Key words: low-permeability reservoir, fractured sandstone, imbibition mechanism, wettability, displacement test, seepage flow

摘要： 低渗透裂缝性油田开发比较复杂,其中水的自发渗吸对原油的开采十分有利。影响渗吸的因素有岩样大小、岩石特性(孔隙度、渗透率)、流体特性(密度、粘度和界面张力)、润湿性、初始含油饱和度以及边界条件等。利用常规室内渗吸实验和先进的核磁共振技术,系统地研究了低渗透裂缝性砂岩油藏中以上各种因素对渗吸的影响程度,得到了一些变化规律,从而为低渗透裂缝性砂岩油藏的开发提供了理论根据.

关键词: 低渗透油藏, 裂缝性砂岩, 渗吸机理, 润湿性, 驱替试验, 渗流