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Abstract：To achieve the dual-carbon goals and promote the efficient utilization and geological sequestration of carbon dioxide, an intelligent CO₂-responsive gel was developed for application in low-permeability, heterogeneous continental reservoirs to enhance CO₂ flooding efficiency and mitigate gas channeling during CO₂ flooding and geological sequestration. A monomeric long-chain tertiary amine surfactant containing specific amide and carboxyl functional groups was synthesized. The surfactant solution undergoes CO₂-induced gelation, leading to a substantial increase in solution viscosity.The resulting gel exhibits irreversible behavior, outstanding structural stability, and excellent thermal resistance; even after heating, its viscosity remains more than four times higher than that of the initial solution. Mechanistically, the surfactant molecules are protonated in the presence of CO₂ and subsequently self-assemble into wormlike micelles. These micelles further interconnect through the synergistic effects of hydrophobic interactions, hydrogen bonding, and electrostatic interactions, ultimately forming a three-dimensional gel network.The intelligent gel effectively controls gas channeling and redirects injected CO₂ into previously unswept low-permeability zones, thereby significantly enlarging the swept volume during gas flooding. Water-alternating-gas (WAG) flooding experiments demonstrate an incremental oil recovery of 23.53% after primary recovery, with a core plugging efficiency of 94%.This study provides important theoretical insights and experimental support for the development of intelligent CO₂-responsive gels, highlighting their potential application in CO₂-assisted enhanced oil recovery and chemical CO₂ sequestration, and contributing to advances in both oil recovery efficiency and geological carbon storage technologies.
| References | [1]Fang, P.; Zhang, Q.; Wu, M.; Zhou, C.; Yang, Z.; Yu, H.; Cao, M. Sep. Purif. Technol. 2025, 359, 130526. [2]Lu, H.; Huang, Z.; Yang, L. L.; Dai, S. J. Dispers. Sci. Technol. 2015, 36 (2), 252–258. [3] Fang, P.; Yang, Z.; Zhang, Q.; Yu, H.; Feng, F.; Wan, Y.; Cao, M. Results Eng. 2025, 106239. |
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| Country | china |
| Green Housing & Porous Media Focused Abstracts | This abstract is related to Green Housing |
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