低渗透裂缝性砂岩油藏渗吸机理及其数学模型

Imbibition Mechanism of Low Permeability Fractured Sandstone Reservoir and Its Mathematical Model

研究了低渗透裂缝性砂岩油藏的渗吸机理 ,分析了各种因素对自发渗吸的影响。对低渗透岩心的自发渗吸实验数据进行了归一化处理 ,改进了三重指数函数模型 ,使之更好地符合低渗透裂缝性砂岩油藏的自发渗吸特性。利用常规室内水驱油实验和核磁共振成像技术 ,研究了驱替条件下渗吸的问题。提出了在低渗透岩心水驱油过程中存在最佳渗流速度 ;并分析了在水驱油过程中的渗吸机理 。

Imbibition mechanism of a low permeability fractured Sandstone reservoir is systematically studied,the effect of various factors on the spontaneous imbibition is analyzed Normalization is implemented on the spontaneous imbibition experimental data of low permeability cores,the model of triple exponential functions is improved to bring better agreement of the spontaneous imbibition characters of the low permeability fractured sandstone reservoir with it The problems of imbibition under displacement are studied by using the techniques of laboratory experiment of water displacement and imaging of nuclear magnetic resonance (NMR) An optimal percolation velocity during the low permeability core displacement is put forward,imbibition mechanism is analyzed during the water displacement,which provides a theoretical guidance for the development of the low permeability fractured sandstone reservoir by water displacement