Chemical-Assisted CO₂ Water-Alternating-Gas Injection for Enhanced Sweep Efficiency in CO₂-EOR.

IF 4.2 2区化学 Q2 BIOCHEMISTRY & MOLECULAR BIOLOGY Molecules Pub Date : 2024-08-22 DOI:10.3390/molecules29163978

Pengwei Fang, Qun Zhang, Can Zhou, Zhengming Yang, Hongwei Yu, Meng Du, Xinliang Chen, Yuxuan Song, Sicai Wang, Yuan Gao, Zhuoying Dou, Meiwen Cao

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Abstract

CO₂-enhanced oil recovery (CO₂-EOR) is a crucial method for CO₂ utilization and sequestration, representing an important zero-carbon or even negative-carbon emission reduction technology. However, the low viscosity of CO₂ and reservoir heterogeneity often result in early gas breakthrough, significantly reducing CO₂ utilization and sequestration efficiency. A water-alternating-gas (WAG) injection is a technique for mitigating gas breakthrough and viscous fingering in CO₂-EOR. However, it encounters challenges related to insufficient mobility control in highly heterogeneous and fractured reservoirs, resulting in gas channeling and low sweep efficiency. Despite the extensive application and research of a WAG injection in oil and gas reservoirs, the most recent comprehensive review dates back to 2018, which focuses on the mechanisms of EOR using conventional WAG. Herein, we give an updated and comprehensive review to incorporate the latest advancements in CO₂-WAG flooding techniques for enhanced sweep efficiency, which includes the theory, applications, fluid displacement mechanisms, and control strategies of a CO₂-WAG injection. It addresses common challenges, operational issues, and remedial measures in WAG projects by covering studies from experiments, simulations, and pore-scale modeling. This review aims to provide guidance and serve as a reference for the application and research advancement of CO₂-EOR techniques in heterogeneous and fractured reservoirs.

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化学辅助二氧化碳注水替代注气以提高 CO2-EOR 的清扫效率。

二氧化碳强化采油（CO2-EOR）是二氧化碳利用和封存的重要方法，是一项重要的零碳甚至负碳减排技术。然而，二氧化碳的低粘度和储层的异质性往往会导致气体的早期突破，从而大大降低二氧化碳的利用和封存效率。水替代气体（WAG）注入是一种在 CO2-EOR 中减缓气体突破和粘指的技术。然而，该技术在高度异质和裂缝储层中遇到了流动性控制不足的挑战，导致气体通道和低扫采效率。尽管 WAG 注入在油气藏中有着广泛的应用和研究，但最新的全面综述要追溯到 2018 年，主要集中在使用常规 WAG 进行 EOR 的机理方面。在此，我们结合二氧化碳-WAG注水技术的最新进展，对其进行了更新和全面的综述，包括二氧化碳-WAG注水的理论、应用、流体置换机理和控制策略，以提高扫采效率。它通过实验、模拟和孔隙尺度建模研究，探讨了 WAG 项目中的常见挑战、操作问题和补救措施。本综述旨在为异质和裂缝储层中 CO2-EOR 技术的应用和研究进展提供指导和参考。

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来源期刊

Molecules 化学-有机化学

CiteScore

7.40

自引率

8.70%

发文量

7524

审稿时长

1.4 months

期刊介绍： Molecules (ISSN 1420-3049, CODEN: MOLEFW) is an open access journal of synthetic organic chemistry and natural product chemistry. All articles are peer-reviewed and published continously upon acceptance. Molecules is published by MDPI, Basel, Switzerland. Our aim is to encourage chemists to publish as much as possible their experimental detail, particularly synthetic procedures and characterization information. There is no restriction on the length of the experimental section. In addition, availability of compound samples is published and considered as important information. Authors are encouraged to register or deposit their chemical samples through the non-profit international organization Molecular Diversity Preservation International (MDPI). Molecules has been launched in 1996 to preserve and exploit molecular diversity of both, chemical information and chemical substances.