低浸透性・タイト油層におけるプロファイル制御、増油回収、炭素貯留のためのCO2フォームの進展

Unofficial AI-generated summary based on the public title and abstract. Not an official translation.

🔬研究者:CO2フォームの安定性・深部伝播・EORと貯留寄与の定量分離といった未解決課題の研究動向を把握できる。

🏢実務担当者:CCUS-EORプロジェクトの設計やフォームシステム選定における技術的留意点を理解する助けになる。

🏛政策担当者:CCUSの貯留効率・長期安定性に関する技術的制約を踏まえ、実証支援や貯留量評価制度の設計に示唆を得られる。

: Low-permeability and tight oil reservoirs are characterized by small pore-throat sizes and strong heterogeneity. During the process of conventional CO 2 flooding, viscous fingering, gravity override, and gas channeling through preferential flow paths are prone to occur, resulting in insufficient sweep efficiency, low CO 2 utilization, and reduced storage efficiency. CO 2 foam can divide the continuous CO 2 gas phase into numerous discrete bubbles, thereby increasing the apparent gas viscosity and reducing the effective gas mobility. Therefore, it has great application potential in profile control, gas-channeling mitigation, enhanced oil recovery (EOR), and geological CO 2 storage. Focusing on the requirements of CO 2 foam flooding and the synergistic development of carbon capture, utilization, and storage-enhanced oil recovery (CCUS-EOR) in low-permeability and tight oil reservoirs, this paper systematically reviews the physicochemical fundamentals, static and dynamic performance evaluation methods, and commonly used foaming systems of CO 2 foam. Particular attention is paid to the foam-stabilizing characteristics and reservoir applicability of surfactant foams, nanoparticle-surfactant composite foams, and related systems. On this basis, the mechanisms of CO 2 foam mobility control and gas-channeling mitigation in porous media are analyzed, and the processes by which foam expands sweep volume through gas-phase division, pore-throat blockage, and selective plugging are clarified. Meanwhile, the main mechanisms by which CO 2 foam improves microscopic displacement efficiency are summarized from the perspectives of interfacial tension regulation, CO 2 mass transfer, oil swelling and viscosity reduction, and wettability alteration. Regarding CO 2 storage, this paper further discusses the influence of foam on CO 2 flow pathways, spatial distribution, and the contributions of different trapping mechanisms, and summarizes the roles of experimental evaluation and numerical simulation in identifying CO 2 storage mechanisms. However, under complex reservoir conditions, CO 2 foam still faces challenges such as insufficient long-term stability, limited deep propagation capacity, difficulty in quantitatively distinguishing the contributions of EOR and storage, and inadequate field-scale evaluation. Future research should focus on the development of temperature-and salinity-resistant composite foam systems, multiscale in situ characterization, long-term storage numerical simulation, and synergistic optimization of EOR and storage, thereby providing theoretical support for the field application of CO 2 foam flooding and CCUS-EOR in low-permeability and tight oil reservoirs.

• semanticscholar https://www.techscience.com/energy/online/detail/28344/pdffirst seen 2026-09-22 05:04:43