【摘要】 利用狭窄平行板裂隙模型来模拟和分析单个裂隙内油运移的过程。实验中采用表面起伏的玻璃板制作平行板裂隙模型,通过改变水中蔗糖的浓度控制两相流体间的密度差,来分析不同密度差和注入速率条件下油的运移过程和特征。观察发现,油在饱含水的狭窄裂隙空间内的运移特征与在孔隙介质中的运移有相似之处:运移的路径只占通道的一部分,都具有不规则的分形特征,也可形成活塞式、指进式和路径式等模式。而这些模式的形成也同样受各种因素的影响。利用孔隙介质中油运移实验结果总结出来的、以Bo数和Ca数为纵横坐标运移相图完全可以用来表征单个裂隙中油的运移模式。更多还原

【Abstract】 A narrow parallel plates model is used to test and analyze oil migration process in a single fracture. Two glass plates, one side surface of which is rough, are used in the model. The density difference between two phases of fluid is realized by changing the salinity of sugar in water. The experiments were done by changing the fluid density difference and the oil injecting velocity. The results show that the pathways of oil migrating in a narrow fracture is similar to those in a porous medium. The pathways may be reckoned by fractal and occupy only a part of the possible path in the medium. Influenced by different factors, the pathways may be in different modes as follows: piston, finger and strangle. These modes observed in the fracture model may be completely characterized by a migration phase diagram that can be synthesized from experiments of oil migration in a porous medium.更多还原