Comparative analysis of permeability rebound and recovery of tectonic and intact coal: Implications for coalbed methane recovery in tectonic coal reservoirs

Effect of CO2 injection on Coalbed Permeability Based on a Thermal–Hydraulic–Mechanical Coupling Model

“…To solve the climate problem and complete the double carbon goal as soon as possible, it is necessary to match effective carbon sink means. − The natural carbon sink is limited by the plant growth law and land area, and the space for increasing carbon sequestration is limited. , Therefore, in the process of achieving carbon neutrality goals, it is necessary to match artificial carbon sequestration technology to provide guarantees for large-scale carbon reduction and timely achievement of carbon neutrality goals. − For this reason, the scholars put forward the geological storage technology. , Geological sequestration technology is a kind of efficient artificial carbon sequestration technology. Deep salt water, abandoned oil and gas deposits, unexploitable coal reservoirs, and so on are excellent geological sequestration places. , Among them, the CO 2 -enhanced coalbed methane (CO 2 -ECBM) technology, which can inject CO 2 into unrecoverable coal seams to drive CBM, can achieve the dual purpose of improving CBM recovery and effectively storing CO 2 , and is considered to be one of the most promising CO 2 geological storage technologies. , CO 2 -ECBM technology is used to inject CO 2 into a reservoir of CH 4 -rich coal, and then CH 4 and CO 2 will compete for adsorption in coal reservoirs. , Due to the relative adsorption advantage of CO 2 from coal reservoirs, CO 2 molecules can displace adsorbed CH 4 molecules from the coal matrix, ultimately achieving a dual benefit for energy and the environment. − However, at present, there is a decrease in the CO 2 injectivity in the pilot field test of CO 2 -ECBM, which cannot reach the expected effect.…”