Abstract:         Water flooding development has become the only way for the ultra low permeability fractured reservoir development. However, due to the problems of reservoir micro fracture development, serious heterogeneity and critical water, resulting the water flooding recovery was low.Spontaneous imbibition oil production is an important way of oil production in this kind of reservoir, on the basis of the use of indoor experiment, the salinity of injected water, core permeability, oil saturation, surfactant, oil viscosity and temperature in a low permeability fractured reservoir were studied systematically. Experimental results show that when the environment formation water salinity is less than the mainland core layer water salinity, or joining a surface active agent could significantly improve spontaneous imbibition effect. as the permeability and oil saturation increased and the crude oil viscosity decreased; capillary imbibition became stronger and the ultimate imbibition recovery is greater; the increase of temperature can increase the initial imbibition rate, but the ultimate imbibition recovery is basically the same, the temperature is not the direct acting factors about imbibition effects in ultra low permeability fractured reservoir.

Key words: Ultra low permeability fractured reservoir,    , Spontaneous imbibition,    , Recovery ratio,    , Influencing factors

摘要：         注水开发已成为裂缝性特低渗油藏开发的必由之路,但由于储层微裂缝发育,非均质严重,油水井暴性水淹,导致水驱采收率较低。渗吸采油是该类油藏重要的采油方式,利用室内实验,系统研究了注入水矿化度、岩芯渗透率、含油饱和度、表面活性剂、原油黏度和温度等因素对特低渗油藏渗吸效果的影响。结果表明,在裂缝性特低渗油藏的开发过程中,当周围环境注入水矿化度小于岩芯内地层水矿化度或加入表面活性剂均可显著提高渗吸程度;渗透率越高,原油黏度越小,含油饱和度越大,毛细管渗吸作用越强,最终渗吸采出程度越大;温度的升高可提高初期渗吸速率,但最终渗吸采出程度基本相同,温度不是影响裂缝性特低渗油藏渗吸效果的直接因素。

关键词: 特低渗裂缝性油藏,   ,  渗吸,    , 采收率,   ,  影响因素