修丽群 刘帅 刘立阳 刘丽丽 张贵鹏

摘 要：近年来，随着注水开发进入特高含水阶段，剩余油的分布形态和流动状况发生了很大变化。为明确微观孔隙剩余油的形成机理，采用计算流体动力学软件Fluent对水驱油藏油滴的变形流动进行数值模拟计算，分析孔道的倾斜角度，润湿角和单根毛管并联双孔道对油滴变形流动规律的影响。研究表明：岩石的不同孔隙倾斜角度可影响油滴的变形，当孔隙与竖直方向存在夹角时，重力的作用不可忽略，驱替方向与重力方向的夹角可影响油滴的变形。并且油滴的变形随着润湿角的增大而更加明显。在单根毛管并联双孔道中，由于毛管半径不同剩余油的运移速度不同，先到达出口的油滴会对其余油滴产生阻碍其运动的力。研究结论可为进一步研究微观孔隙油滴变形机理提供理论依据。

关 键 词：特高含水期;油滴变形;微观孔隙;数值模拟

中图分类号：TE 357 文献标识码： A 文章编号： 1671-0460（2015）06-1443-03

Research on Oil Droplets Deformation Flow of Water-flooding Reservoir

XIU Li-qun 1，LIU Shuai2，LIU Li-yang2，LIU Li-li1，ZHANG Gui-peng3

（1. Northeast Petroleum University， Heilongjiang Daqing 163318，China;

2. Daqing Oilfield Company No.1 Oil Production Plant， Heilongjiang Daqing 163000，China

3. Daqing Oilfield Company Downhole Operation Branch， Heilongjiang Daqing 163000，China）

Abstract： In recent years， the water injection development has entered the stage of super high water cut. The distribution of remaining oil and the flow condition have changed greatly. To clarify the formation mechanism of remaining oil in micro pores， computational fluid dynamics software Fluent was used for numerical simulation of the oil droplets deformation flow of water-flooding reservoir， and then the influence of tilt angle of the channel， wetting angle and the single capillary tube parallel double channel on the flow of oil droplets was analyzed. The results show that， the different angle of the pore can affect the deformation of oil droplets; when there is angle between the pore and the vertical， the effect of gravity should not be neglected. The angle between the displacement direction and the gravity can affect the deformation of the oil droplets. And for oil wet rock， the deformation of the oil droplets becomes more obvious with the increase of wetting angle. In the single capillary tube parallel double channel， due to different capillary radius， residual oil migration velocity is different. And the oil droplets which first reach the exit will give the remaining oil droplets a force that can hinder their movement. The research conclusion may provide a theoretical basis for further study of deformation mechanism of oil droplets in the microscopic pore.

Key words： high water cut stage; droplet deformation; microscopic pores; numerical simulation

隨着注水开发进入特高含水阶段[1]，剩余油分布形态及流动状况发生了巨大的变化，微观孔隙结构中的剩余油如何移动，移动的影响因素[2-5]是什么等问题己经成为特高含水期油田开发无法回避的关键问题[6，7]。以往的研究多数停留在静态分析的基础上，本文采用GAMBIT软件，建立微观孔隙二维模型。基于Fluent软件平台，应用VOF模型，在Fluent中实现油滴在微孔隙中真实运动的数值模拟，结合计算流体动力学，讨论分析孔道的倾斜角度，润湿角和单根毛管并联双孔道对油滴变形流动规律的影响，为微观孔隙结构中的油滴变形流动提供理论基础。……