CO₂-enhanced coalbed methane (CO₂-ECBM) can improve coalbed methane production efficiency and simultaneously alleviate greenhouse gas emissions. In this paper, we integrated TOUGH2 and FLAC3D numerical simulation software to conduct hydro-mechanical coupling analysis for effects of hydrofracturing and secondary fracturing in CO₂-ECBM. The simulation results show that the hydrofracturing and secondary fracturing treatments significantly increase the coal seam interconnectivity, enhancing overall injection and production. The reduction of the pore pressure near injection wells can effectively reduce the damage of gas injection well. Moreover, secondary fracturing can even increase cumulative gas production up to 32.5%. In addition to rising fracture density, increasing the fracture length is also considered an efficacious procedure for enhancing permeability in the secondary fracturing process.

CO ₂增强煤层气（CO ₂ -ECBM）可以提高煤层气的生产效率，同时减少温室气体的排放。在本文中，我们集成了TOUGH2和FLAC3D数值模拟软件，以进行水力耦合分析，以分析CO _2中的水力压裂和二次压裂效果。-ECBM。模拟结果表明，水力压裂和二次压裂处理显着提高了煤层的连通性，提高了整体注采量。降低注入井附近的孔隙压力可以有效减少注气井的损害。此外，二次压裂甚至可以将累计天然气产量提高到32.5％。除了增加裂缝密度之外，增加裂缝长度也被认为是提高二次压裂过程中渗透率的有效方法。