用于CO2地质封存的pH响应型智能凝胶封窜剂 研究进展*

Progress on pH Responsive Smart Gels as Sealants for CO2 Geologic Storage

赵 莉 刘 琦 马忠诚 彭 勃

ZHAO Li LIU Qi MA Zhongcheng PENG Bo

CO2捕集、利用与封存技术（CCUS）对实现温室气体深度减排具有重要意义，但在其注入和封存过程中，可 能发生CO2的泄露或逃逸。井筒完整性的失效是CO2泄露的主要途径。目前，提高井筒水泥完整性的技术大多 是关于防腐蚀水泥体系的改性或者补注水泥。但注入性更佳、稳定性更强且成本较低的聚合物凝胶，可实现井 筒完整性失效的预防及修复。pH响应型聚合物凝胶目前受到广泛的关注，其可以对地层环境的变化做出智能 响应；即地层pH发生变化时，水凝胶会吸水膨胀，体积变大，进而实现对完整性失效水泥的有效封窜。本文详细 论述了国内外用于CO2地质封存封窜剂的研究进展，重点分析了pH响应型凝胶的封窜机理和封窜性能，并讨论 了其未来发展方向及应用前景。图2参58

Carbon dioxide capture，utilization and storage（CCUS）technology is of great significance for the mitigation of climate change. However，CO2 leakage may occur during gas injection and storage. The failure of wellbore integrity is the main way of CO2 leakage. At present，the research of wellbore cement integrity is mostly about the modification of anticorrosive cement system or cement squeezing. Thus，choosing polymer gel with better inject ability，stronger stability and lower cost can prevent and repair the failure wellbore. Smart polymer gels are currently receiving widespread attention，which can respond intelligently to changes in the formation environment. When the pH of the formation changes，the hydrogel will swell and expand，and the shape will become larger，thereby achieving effective sealing of the failure cement. The research progress of sealants for carbon dioxide geological storage was introduced in detail in this study，and the sealing mechanism and sealing performance of pH-responsive gels were critical reviewed，and then the future development direction and application prospects were discussed as well.

10.19346/j.cnki.1000-4092.2020.02.033