多孔介质中气水渗流的微观机理研究

MICROSCOPIC MECHANISM STUDY OF GAS-WATER FLOW IN POROUS MEDIA

朱华银 周娟 万玉金 黄立信

ZHU Hua-yin ZHOU Juan WAN Yu-jin HUANG Li-xin

西南石油学院, 四川, 成都, 610500 2. 中国石油, 勘探开发研究院, 廊坊分院, 河北, 廊坊, 065007

Southwest Petroleum Institute, Chengdu, Sichuan 610500, China 2. Langfang Branch, Research Institute of Petroleum Exploration and Development, SINOPEC, Langfang, Hebei 065007, China

利用微观玻璃模型进行了气水两相渗流微观机理研究.孔隙水平的直观观察表明:气水两相排驱和渗吸的微观渗流机理截然不同,低流速时虽然二者均受毛管力的影响,但排驱时气水前缘始终沿连续的大喉道路径运移,存在明显的跳跃式运移现象;速度较高时,有明显的粘性指进现象,气体前缘呈树枝状,随流速的增加,分叉更多.而低速渗吸时水沿壁进入孔隙,首先充满小喉道,发生严重的毛管指进,并沿壁能到达孔隙模型的各个角落,前缘推进随流速的增加而变得均匀.实验结束后的气水微观分布分析,对提高油气采收率的研究具有指导意义.

Microscopic mechanism of the percolation of 2 phrases of gas and water in an etched porous net on a 2 dimensional glass board is investigated. Direct observation of horizontal pores shows that, driving of the 2 phrases of gas and water is quite different from imbibition. Although both of them are influenced by capillary force when gas and water flow slowly, the front of gas and water continuously flows and obviously skipps in the paths of big pores when they are driven. However, when they flow rapidly, an obvious phenomenon of viscous fingering could be found. The front of gas occurs as tree branches. The branching of it increases with the increasing velocity of gas and water. When water is imbibited slowly into pores along pore walls, it fills the small pore throats and fingers when driven by strong capillary force. It reaches every corner of the pore model along pore walls. The front of water propels evenly with the increasing velocity. Analysis of the micro-distribution of gas and water after experiment is helpful for improving oil and gas recovery efficiency.

国家“九五”重点科技攻关项目(99-110-01-03).

https://doi.org/10.11781/sysydz200406571