Abstract:

In order to research on the impact of imbibition effects, mechanisms and the correlation factors of the tight oil cores, the experimental devices of tight core imbibiton were established. The experiments of oil-water imbibition of tight sandstone were carried out. The effects of temperature, pressure and surfactant on the oil-water imbibition in compacted core were studied. The curves of imbibition efficiency versus time, characteristic points of curve and the influential factor of imbibition were analyzed. The imbibition law and characteristics of tight sandstone core were obtained. The results showed that the effect of imbibition was mainly occurred on the surface layer of the tight oil core. The temperature had a large effect on the second stage of imbibition. The oilwater imbibiton efficiency of the single tight oil core is about 10%, which is about 25% under the formation conditions.

Key words: Tight oil,    , Imbibition experiment,    , Imbibition mechanisms,    , Experimental device,    , Imbibition efficiency

摘要：         为了研究致密油岩心的渗吸作用、机理及影响因素,建立了致密岩心渗吸实验装置,进行了致密砂岩岩心油水渗吸实验,研究了温度、压力和表面活性剂等因素对致密岩心油水渗吸效果的影响,分析了渗吸效率随时间变化曲线、曲线特征点及渗吸影响因素,得到了致密砂岩岩心渗吸规律及特征。结果表明,渗吸作用主要发生在基质岩心的表层,温度对渗吸的第二个阶段有较大的影响。单面致密油岩心油水渗吸效率在10%左右,地层条件下油水渗吸效率在25%左右。

关键词: 致密油,   ,  渗吸实验,   ,  渗吸机理,   ,  实验装置,   ,  渗吸效率