An intelligent CO2-responsive hydrogel for applications in enhanced oil recovery and CO2 geological storage

作者：Pengwei Fang, Qun Zhang, Mingyue Wu, Can Zhou, Zhengming Yang, Hongwei Yu, Zemin Ji, Yina Yi, Wen Jiang, Xinliang Chen, Yuan Gao, Mengfei Zhou, Meiwen Cao · 发表于：Separation and Purification Technology · 年份：2024 · DOI：10.1016/j.seppur.2024.130526 · 被引用次数：28 · 研究领域：Enhanced Oil Recovery Techniques、CO2 Sequestration and Geologic Interactions、Hydrocarbon exploration and reservoir analysis

A novel CO 2 -responsive hydrogel for intelligent control of gas channeling in CO 2 – enhanced oil recovery (CO 2 -EOR) and geological CO 2 storage has been developed. A monomeric long-chain tertiary amine surfactant (HXB-2) that has specific amide and carboxyl groups was synthesized. The surfactant can interact with CO 2 in aqueous solution to increase the viscosity and induce gelation. The hydrogel is irreversible and does not revert to solution phase after N 2 bubbling. It shows excellent structural stability and thermal resistance and the viscosity remains four times higher than that of the initial solution upon heating. For the mechanism, HXB-2 protonates in CO 2 environment and self-assembles into worm-like micelles (WLMs) under synergistic forces of hydrophobic interaction, hydrogen bonding, and electrostatic interaction, which further crosslink to form a three-dimensional (3D) network to induce gelation. The hydrogel can be formed in-situ to control gas channeling intelligently and redirect the gas to unswept low-permeability channels. It can enhance the recovery rate by 23.53 % and the maximum seepage resistance reaches 29.45 MPa·min·cm −3 for water-alternatinggas flooding. Moreover, by having spontaneous association and shear-dissociation properties, the hydrogel in the rock pores causes minimal damage to the reservoir. This study provides valuable insights and empirical support for the development of irreversible CO 2 -responsive hydrogels for CO 2 chemical sequest...