Author:
Li Binhui,Liu Yong,Lan Yubo,Li Jiawei,Lang Yue,Rahman Sheikh S.
Abstract
AbstractThis work introduces and discusses the impacts of the water bridge on gas adsorption and diffusion behaviors in a shale gas-bearing formation. The density distribution of the water bridge has been analyzed in micropores and meso-slit by molecular dynamics. Na+ and Cl− have been introduced into the system to mimic a practical encroachment environment and compared with pure water to probe the deviation in water bridge distribution. Additionally, practical subsurface scenarios, including pressure and temperature, are examined to reveal the effects on gas adsorption and diffusion properties, determining the shale gas transportation in realistic shale formation. The outcomes suggest carbon dioxide (CO2) usually has higher adsorption than methane (CH4) with a water bridge. Increasing temperature hinders gas adsorption, density distribution decreases in all directions. Increasing pressure facilitates gas adsorption, particularly as a bulk phase in the meso-slit, whereas it restricts gas diffusion by enhancing the interaction strength between gas and shale. Furthermore, ions make the water bridge distributes more unity and shifts to the slit center, impeding gas adsorption onto shale while encouraging gas diffusion. This study provides updated guidelines for gas adsorption and transportation characteristics and supports the fundamental understanding of industrial shale gas exploration and transportation.
Funder
China National Petroleum Corporation
Publisher
Springer Science and Business Media LLC
Reference59 articles.
1. BP Energy Outlook (2018). 2019; 1–125. https://www.bp.com/content/dam/bp/business-sites/en/global/corporate/pdfs/energy-economics/energy-outlook/bp-energy-outlook-2018.pdf
2. Jeon, P. R. & Lee, C.-H. Effect of surfactants on CO2 solubility and reaction in CO2-brine-clay mineral systems during CO2-enhanced fossil fuel recovery. Chem. Eng. J. 382, 123014 (2020).
3. Rexer, T. F., Mathia, E. J., Aplin, A. C. & Thomas, K. M. Supercritical methane adsorption and storage in pores in shales and isolated kerogens. SN Appl. Sci. 2(4), 780 (2020).
4. Liu, J., Zhang, T. & Sun, S. Stability analysis of the water bridge in organic shale nanopores: A molecular dynamic study. Capillarity 5(4), 75–82 (2022).
5. Li, J., Wang, Y., Chen, Z. & Rahman, S. S. Effects of moisture, salinity and ethane on the competitive adsorption mechanisms of CH4/CO2 with applications to coalbed reservoirs: A molecular simulation study. J. Nat. Gas Sci. Eng. 95, 104151 (2021).