Analysis of the seepage-diffusion law and transformation mechanism in the CO2 flow adsorption test under various laminae
Year: 2025
Type: article
Abstract: Physical simulation experiments of CO 2 flow adsorption under various stratigraphies were conducted in the coal seam CO 2 injection project for gas replacement, as CO 2 is in the flow state and the mechanism of CO 2 adsorption in the flow state in the coal seam is still unclear. In the process of CO 2 flow adsorption, the results indicate that seepage in the horizontal stratigraphic direction is predominant, while diffusion in the vertical stratigraphic direction is predominant. The ratio of CO 2 flow adsorption in the horizontal stratigraphic direction is primarily distributed below 50%, and seepage is the dominant process during the CO 2 flow adsorption test. Conversely, the ratio of adsorption in the vertical stratigraphic direction is typically greater than 50%, and diffusion is the dominant process. During the control test, when the outlet was sealed (one-way CO 2 injection without return), the seepage impact diminished while the diffusion effect intensified, resulting in an increase of the saturated CO 2 adsorption quantity to 1.3 to 4.8 times that of the flow adsorption system. In the CO 2 replacement of CH 4 project, when CO 2 penetrates a specific distance, the extraction holes are sealed, thereby prolonging the diffusion period of CO 2 to ensure complete adsorption in competition with CH 4 , ultimately enhancing the utilization efficiency of CO 2 .
Source: Scientific Reports
Authors: Bing Liang, Xiaoyang Zhang, Weiji Sun, Xintao Chen, Shiyao Zhang
Institution: Liaoning Technical University
Language: English
Subfield: Ocean Engineering
Field: Engineering
Domain: Physical Sciences
SDG: Climate action
Open Access status: gold
Estimated APC paid: $2,690
Funder: Liaoning Technical University
OpenAlex ID: W4413875118