不同孔隙类型礁灰岩模型微观水驱渗流实验

Experimental study on micro water flooding seepage of real reef limestone with different pore types

为了更好地了解礁灰岩储层中的流体在微观渗流过程中的渗流规律和分布特征,文中以流花油田D5P1井为例,利用礁灰岩岩心制作了岩心薄片模型,采用可视化技术微观模拟水驱油过程,并选取具有代表性的4种孔隙类型进行对比分析研究。实验观察发现,裂缝方向与微观流体渗流和剩余油的分布密切相关,孔洞的存在有利于提高岩心采收率,在驱替结束时基质中普遍存在大量的剩余油。这些发现为该油田下一步进行注水开发提供了参考依据。

In order to understand the micro-seepage regularity and remaining oil distribution characteristics of the fluid in the reef limestone reservoir, the real core of the D5P1 Well in the Liuhua Oilfield is used to make the core model. The experimental process of microscopic water flooding was observed by visualization technique, and four representative types of porosity were selected for comparative analysis. The experimental observation shows that the direction of the fracture is closely related to the micro fluid seepage and the distribution of remaining oil; the pores are beneficial to improve the recovery of crude oil, and large amounts of residual oil are present in the matrix at the end of displacement. These findings provide a reference for the further development of water injection in this oilfield.