储层岩心孔隙结构变化对流体流动速度变化影响  

The influences of pore structure changes in reservoir on fluid flow velocity

作　　者：白永强[1,2] 李娜[2] 姜莎莎[3] 姜振学[1] 刘常红[4] 

机构地区：[1]中国石油大学(北京)非常规天然气研究院,北京102249 [2]东北石油大学电子科学学院,黑龙江大庆163318 [3]大庆油田有限责任公司第四采油厂,黑龙江大庆163511 [4]中国石化石油勘探开发研究院,北京100083

出　　处：《东北石油大学学报》2014年第1期85-90,6,共6页Journal of Northeast Petroleum University

基　　金：国家自然科学基金项目(51274068)

摘　　要：储层岩心孔隙结构的改变对流体的动力学特性有重要影响,进而影响石油采收率变化.利用原子力显微镜表征岩心在纳米—微米尺度上的微观结构,定量描述岩心的形态特点;利用Comsol Multiphysics软件分析孔隙内流体流动特性,获得岩心关键点处孔隙直径微小变化对流体的流动速度影响规律.结果表明:岩心内流体的流动速度与孔隙直径大小并非为简单的正比例关系,而是同时受到其他孔隙协同变化的影响;孔隙大小存在阈值点,在阈值点两侧微孔中流体的流速随孔隙变化的改变规律不同.该研究结果对确定次生孔隙及其变化对三次采油效率提高的关键因素具有指导意义.The change of pore structure has important effect on micro fluid dynamics in oil reservoir core, this effect is closely related to the change of oil recovery.Characterizing original rock microstructure on nano-micro scale by atomic force microscopy to describe the characteristics of the core accurately,changes of pore diameter and micro fluid velocity are studied by Comsol Multiphysics 3.3to acquire the effect rule of the tiny.Interrelated analyses conclude that there is not a direct proportion relationship between micro fluid velocity and the size of the pore diameter in oil reservoir core.At the same time,coordinated variation of other porosity will influence micro fluid velocity.Further analysis showed that there is a threshold point of pore size.With the variation of pore diameter,the change regularities of micro fluid velocity are very different on both sides of the threshold point.These conclusions are very useful to confirm the influence of secondary pore or the change of secondary pore qualitatively and quantificationally for enhancing oil recovery.

关 键 词：储层 岩心 孔隙结构 流体速度 原子力显微镜 表征 

分 类 号：TE31[石油与天然气工程—油气田开发工程]