CO2 huff-n-puff has proven to be an effective method for enhanced gas recovery (EGR). However, the current huff-and-puff simulation model must consider the comprehensive flow mechanism crucial for accurate reservoir and huff-n-puff simulation. Besides, the feasibility of effective CO2 storage by huff-n-puff in shale gas reservoirs is still being determined. Therefore, to improve this situation, this paper establishes a comprehensive CO2 huff-n-puff model, and the engineering factors for huff-and-puff and storage effects are evaluated. This meaningful work provides theoretical support for promoting CO2 to improve gas recovery and storage in shale reservoirs.
Keywords CCUS, CO2 huff-n-puff, shale gas, EGR, MRST