Effect of CO2 on coal P-wave velocity under triaxial stress

Experimental Study on the Effects of High- and Low-Temperature Cyclic Impact on Pore and Fracture Distributions and Acoustic Emission Characteristics of Coal Measure Sandstone

“…Three parallel samples were tested under different high- and low-temperature impact conditions to reduce the randomness error of the experiment. A P -wave velocity test was conducted on the samples, and samples with similar P -wave velocities were selected for the test to ensure that the development of pore cleavage of the samples had a similarity …”

CO2 Adsorption/Desorption, Induced Deformation Behavior, and Permeability Characteristics of Different Rank Coals: Application for CO2-Enhanced Coalbed Methane Recovery

“…The carbon capture and storage (CCS) technology means the process of separating CO 2 from industrial or related emission sources, transporting it to storage sites, and isolating it from the atmosphere for a long time, which is considered to be the most feasible and immediate way to reduce greenhouse gas emissions and slow down global warming on a large scale in the future. , However, the biggest problem is that the implementation of the CCS project may be costly and require a big budget because no useful products or profits can be created in this process. In more recent years, CO 2 utilization has been included in the CCS concept and a new terminology has been formed, i.e., carbon capture utilization and storage (CCUS). , Injecting CO 2 into the deep coal seams (CO 2 -ECBM) is one of the important ways to realize CO 2 utilization. , It can replace and displace CH 4 to improve the coalbed methane (CBM) recovery efficiency by utilizing the competitive adsorption effect between CO 2 and CH 4 molecules simultaneously; the sequestrated CO 2 in a coal seam can also effectively reduce the carbon emissions. , This technology has attracted lots of attention in China and several CO 2 -ECBM demonstration projects have been developed in Ordos Basin and Qinshui Basin, confirming the effectiveness for raising the CBM production and promoting the CO 2 geological storage …”

“…The carbon capture and storage (CCS) technology means the process of separating CO 2 from industrial or related emission sources, transporting it to storage sites, and isolating it from the atmosphere for a long time, which is considered to be the most feasible and immediate way to reduce greenhouse gas emissions and slow down global warming on a large scale in the future. 1,2 However, the biggest problem is that the implementation of the CCS project may be costly and require a big budget because no useful products or profits can be created in this process. In more capture utilization and storage (CCUS).…”