在异质多孔介质中对CO2泡流的微流体研究
Nikoo Moradpour1, Peichun Amy Tsai1
1Department of Mechanical Engineering, University of Alberta, Edmonton, Alberta T6G 2R3, Canada. peichun.amy.tsai@ualberta.ca.
Lab on a chip
|October 10, 2025
概括
二氧化碳 (CO2) 泡通过改善异质水库中的流动性控制来增强石油回收. 微流体研究表明,泡性能优于二氧化碳气体,通过孔隙阻塞和流量转移实现更高的回收率.
科学领域:
- 石油工程是石油工程中的一个.
- 化学工程是化学工程的重要组成部分.
- 流体动力学 流体动力学
背景情况:
- 增强石油回收 (EOR) 旨在改善石油开采,超越初级和二级方法.
- 二氧化碳泡是一种有前途的EOR剂,用于控制移动性,但其在异质介质中的孔尺度机制尚未完全理解.
- 微流体学提供了一个平台,以可视化和研究多相孔尺度的多相流现象.
研究的目的:
- 在微流体异质多孔介质中研究二氧化碳泡流和油位移的孔尺度动态.
- 为了比较二氧化碳泡与二氧化碳气体和表面活性剂溶液的EOR性能.
- 为了阐明泡生成,传播和油位移在各种透区的机制.
主要方法:
- 微流体装置的制造,具有并行的高和低透区域 (透率为5.8).
- 使用流量聚焦几何形状生成二氧化碳泡,气泡大小由气体压力和液体流量控制.
- 在不同的EOR方法下分析泡形态,运输特性 (气体注射比,气体面积分数,气体捕获,泡速度,泡纹理) 和油位效率.
主要成果:
- 稳定的二氧化碳泡 (30-270微米) 产生,其形态受气体注入比率 (Rg) 的影响.
- 增加Rg导致更高的气体面积分数 (Fg),增加气体捕获,减少泡速度和质地.
- 二氧化碳泡泛滥实现了高达100%的石油回收,通过防止粘性指纹和使流量转移到低透区,显著优于二氧化碳气体注入.
结论:
- 二氧化碳泡是异质多孔介质中高效的EOR剂,在石油回收效率方面超过了二氧化碳气体.
- 泡诱导的孔隙阻塞和流量转移是增强在异质形成中的石油回收的关键机制.
- 微流体实验为孔尺度多相传输现象提供了宝贵的见解,有助于优化EOR策略.
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