工矿自动化2026，Vol.52Issue(5)：176-184,9.DOI:10.13272/j.issn.1671-251x.2025120105
热流固耦合作用下注采参数对CO2驱替瓦斯影响规律研究
Influence of injection-production parameters on CO2 displacement of gas under thermal-hydraulic-mechanical coupling
摘要
Abstract
Injection of CO2 to displace gas is a key method to improve gas extraction efficiency in deep low-permeability coal seams,and can also realize CO2 geological storage,delivering both economic and environmental benefits.To investigate the laws of CO2 injection into coal seams for gas displacement,a thermal-hydraulic-mechanical coupling model considering binary gas seepage,diffusion,competitive adsorption,and coal deformation was proposed.With COMSOL numerical simulation software,dynamic changes in CO2 concentration,coal permeability,and temperature under different gas injection pressures and injection-production spacings were systematically studied,and CH4 recovery rate and CO2 storage amount under different injection-production parameters were analyzed to evaluate the displacement effect.The results showed that:① increases in gas injection pressure and injection-production spacing could significantly improve the diffusion capacity of CO2 in coal,intensify coal deformation,and make fluctuations in permeability and temperature more obvious.② When gas injection pressure increased from 0.5 MPa to 2.5 MPa,CH4 recovery rate and CO2 storage amount after 60 d of injection increased by 10.47％and 387.00％,respectively,and CO2 storage amount was more sensitive to changes in gas injection pressure.③ When injection-production spacing increased from 3 m to 7 m,CH4 recovery rate and CO2 storage amount after 60 d of injection increased by 48.34％and 9.19％,respectively,and CH4 recovery rate was more sensitive to changes in injection-production spacing.④ Engineering applications should optimize injection-production parameters according to actual objectives.If gas production enhancement was the main goal,injection-production spacing should be increased preferentially.If CO2 storage was the main goal,gas injection pressure should be increased preferentially.Field process tests further confirmed that increasing gas injection pressure and injection-production spacing could effectively improve gas extraction rate and yield,verifying the reliability of the thermal-hydraulic-mechanical coupling model.关键词
热流固耦合模型/CO2驱替瓦斯/注气压力/注采间距/煤体渗透率Key words
thermal-hydraulic-mechanical coupling model/CO2 displacement of gas/gas injection pressure/injection-production spacing/coal permeability分类
矿业与冶金引用本文复制引用
朱由创,张黎明,田小强,杨秀福..热流固耦合作用下注采参数对CO2驱替瓦斯影响规律研究[J].工矿自动化,2026,52(5):176-184,9.基金项目
国家自然科学基金项目(52174072). （52174072）
