驱油用CO2泡沫体系粒径对其性能影响研究  

Study on impact of particle size of CO2 foam system for flooding on its performance

作　　者：刘双星 彭勃[1] 刘琦 李兴春 薛明 LIU Shuangxing;PENG Bo;LIU Qi;LI Xingchun;XUE Ming(China University of Petroleum(Beijing),Beijing 102249,China;CNPC Research Institute of Safety and Environment,Beijing 102206,China)

机构地区：[1]中国石油大学(北京),北京102249 [2]中国石油集团安全环保技术研究院有限公司,北京102206

出　　处：《油气藏评价与开发》2020年第3期33-38,共6页Petroleum Reservoir Evaluation and Development

摘　　要：CO2由于其独特的物理性质和其与原油之间的理化反应,被广泛用作驱替剂应用于原油开采过程中。但纯气体驱油易发生气窜现象,将CO2用于泡沫驱过程,既能发挥CO2气体本身的驱油作用,又能够实现流度控制,减少气窜现象发生的可能性。对粒径不同、化学组成相同的CO2泡沫体系的稳定性、粒径变化、渗流特征等进行了实验研究,得到了粒径对泡沫性能影响的变化规律,并对影响方式进行了分析与讨论。结果显示,气泡粒径越小,泡沫体系的稳定性越好、封堵能力越强,且粒径随时间变化越缓慢。通过改变制备工艺,减小泡沫体系的粒径,有利于驱油用泡沫体系稳定性和原油驱替能力的提升。CO2 is widely used as a displacement agent in oil displacement because of its unique physical properties and its chemical reaction with crude oil.But pure CO2 gas flooding is prone to gas channeling.So the application of CO2 in the foam flooding process make CO2 can not only play its own role in oil displacement,but also realize fluidity control and reduce the possibility of gas channeling.In this study,the stability,particle size change and percolation characteristics of CO2 foam with different particle sizes and the same chemical composition are experimentally studied,the change rule of the influence of particle size on foam performance is obtained,and the influence mode is analyzed and discussed.The results show that the smaller the bubble size,the better the stability of the foam system,the stronger the blocking ability,and the slower the particle size changes over time.Changing the preparation method to reduce the particle size of the foam system can effectively improve the foam’s stability and EOR capacity.

关 键 词：CO2泡沫 原油驱替 粒径 稳定性 渗流 

分 类 号：TE355[石油与天然气工程—油气田开发工程]