Effect of CO injection pressure on enhanced coal seam gas extraction.

The CO displacement of coal seam gas can simultaneously promote gas extraction and CO sequestration, with gas injection pressure being a key factor influencing both efficiency and safety. This study examined the impact of varying CO injection pressure on gas extraction and sequestration. The findings indicated that higher CO injection pressures reduced the gas injection and extraction time costs, increased the equilibrium pressure and coal seam temperature, and decreased carbon sequestration efficiency.