ABSTRACT

Surfactant assisted spontaneous imbibition is a feasible method for enhanced oil recovery in the reservoirs. A series of pore-scale visual spontaneous imbibition experiments of surfactant solution in oil-wet capillary tubes with six different diameters (10 μm~60 μm) are thoroughly investigated. The results showed that the final imbibition recovery exhibited a rise and fall tendency in sequence with the increase of capillary tube diameter. The combination of the Marangoni effect and diffusion effect was the dominant power to render the oil be expelled, and the wettability alteration was principally conducive to the migration of expulsion oil. Additionally, emulsification entrainment was beneficial to imbibition recovery.

摘要

表面活性剂辅助自吸是提高油藏采收率的可行方法。深入研究了表面活性剂溶液在六种不同直径（10 μm~60 μm）的油湿毛细管中的一系列孔隙尺度视觉自吸实验。结果表明，随着毛细管直径的增加，最终的自吸恢复呈现出依次上升和下降的趋势。Marangoni效应和扩散效应共同作用是排油的主导动力，润湿性改变主要有利于排油的运移。此外，乳化夹带有利于吸胀恢复。