Visualization investigation of fluid transport in multiscale porous media for CO2-EOR based on microfluidic technology†

IF 6.1 2区 工程技术 Q1 BIOCHEMICAL RESEARCH METHODS
Lab on a Chip Pub Date : 2025-03-25 DOI:10.1039/D5LC00019J
Jianxiang Wang, Jiafeng Sun, Jiawei Shi and Bo Bao
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Abstract

During oil extraction, the recovery rates of traditional methods have been gradually declining. CO2-enhanced oil recovery (CO2-EOR) has been utilized since the 1960s; however, in recent years, it has garnered renewed attention due to its environmental benefits and economic advantages. However, there are few reports addressing multiphase mass transfer in micro- and nano-scale pores. This study employs microfluidic technology to simulate the pore structures of real reservoir rocks. A fracture–matrix porous medium chip with a network channel structure and a microscale porous medium chip featuring multiple pore-throat ratios were designed to investigate the effects of cross-scale interactions, network channel geometries, and the Jamin effect on fluid flow patterns and oil recovery rates during both CO2 miscible and CO2 immiscible flooding processes. The experiments demonstrated that the cross-scale effect facilitates the rapid achievement of a 100% recovery rate during CO2 miscible flooding, but exacerbates gas channeling during CO2 immiscible flooding, resulting in a decreased recovery rate. The Jamin effect becomes more pronounced with increasing pore-throat ratios, and the substantial capillary resistance generated by this effect in regions with high pore-throat ratios significantly reduces the rate of increase in recovery during CO2 miscible flooding, as well as the overall recovery rate during CO2 immiscible flooding. This study enhances the understanding of multiphase mass transfer in reservoir conditions and provides critical insights for optimizing CO2-EOR strategies, ultimately contributing to more efficient oil recovery and supporting sustainable practices in the energy sector.

Abstract Image

基于微流体技术的CO2-EOR多尺度多孔介质流体输运可视化研究
在采油过程中,传统方法的采收率逐渐下降。自20世纪60年代以来,二氧化碳提高采收率(CO2-EOR)一直在使用;然而,近年来,由于其环境效益和经济优势,它重新引起了人们的关注。然而,关于微纳米尺度孔隙中多相传质问题的报道很少。本研究采用微流体技术模拟真实储层岩石孔隙结构。设计了具有网络通道结构的裂缝基质多孔介质芯片和具有多个孔喉比的微尺度多孔介质芯片,以研究CO2混相和CO2非混相驱过程中跨尺度相互作用、网络通道几何形状和Jamin效应对流体流动模式和采收率的影响。实验表明,在CO2混相驱过程中,跨尺度效应有助于快速实现100%的采收率,但在CO2非混相驱过程中,跨尺度效应加剧了气窜,导致采收率下降。随着孔喉比的增加,Jamin效应变得更加明显,在高孔喉比区域,这种效应产生的大量毛管阻力显著降低了CO2混相驱采收率的提高速度,以及CO2非混相驱的总体采收率。该研究增强了对油藏条件下多相传质的理解,为优化CO2-EOR策略提供了重要见解,最终有助于提高石油采收率,并支持能源行业的可持续实践。
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来源期刊
Lab on a Chip
Lab on a Chip 工程技术-化学综合
CiteScore
11.10
自引率
8.20%
发文量
434
审稿时长
2.6 months
期刊介绍: Lab on a Chip is the premiere journal that publishes cutting-edge research in the field of miniaturization. By their very nature, microfluidic/nanofluidic/miniaturized systems are at the intersection of disciplines, spanning fundamental research to high-end application, which is reflected by the broad readership of the journal. Lab on a Chip publishes two types of papers on original research: full-length research papers and communications. Papers should demonstrate innovations, which can come from technical advancements or applications addressing pressing needs in globally important areas. The journal also publishes Comments, Reviews, and Perspectives.
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