Evaluation of impact of surface diffusion on methane recovery via carbon dioxide injection in shale reservoirs

Injection of carbon dioxide into shale reservoirs is a promising technology for enhancing natural gas recovery and reducing greenhouse emissions. Nanoscale phenomena contribute to significant difference in mass transfer processes within shale-gas compared conventional reservoirs. Previous investigations have shown the significance surface diffusion mechanisms. Surface was added an established apparent permeability model, which then applied first time numerical reservoir simulations model CO2 injection techniques. Most publications date used theoretical predict coefficient low-pressure condition, whereas, this paper, it has been estimated from gravimetric experiments. Shale reservoirs, with different petrophysical properties, were generated investigate efficiency transport via diffusion. A recently proposed fractal impact rock roughness on CH4 production. The results show that plays role increasing by up 3.2% when average pore radius less than 2 nm. In particular, high dimension can potentially enhance production 1.5% should not be neglected 1 areas capacity, adsorption desorption molecules may increase 2.74% 2.3%, respectively, models no all examined, geostatistical showed heterogeneity favourable methane techniques, except Barnett reservoir. To best our knowledge, work implement simulator techniques at various properties.