Characterization of the Macroscopic Impact of Diverse Microscale Transport Mechanisms of Gas in Micro-Nano Pores and Fractures

Yintao Dong (), Laiming Song, Fengpeng Lai, Qianhui Zhao, Chuan Lu, Guanzhong Chen, Qinwan Chong, Shuo Yang and Junjie Wang
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Yintao Dong: CNOOC Research Institute, Beijing 100028, China
Laiming Song: CNOOC Research Institute, Beijing 100028, China
Fengpeng Lai: School of Energy Resources, China University of Geosciences, Beijing 100083, China
Qianhui Zhao: School of Energy Resources, China University of Geosciences, Beijing 100083, China
Chuan Lu: CNOOC Research Institute, Beijing 100028, China
Guanzhong Chen: CNOOC Research Institute, Beijing 100028, China
Qinwan Chong: CNOOC Research Institute, Beijing 100028, China
Shuo Yang: CNOOC Research Institute, Beijing 100028, China
Junjie Wang: CNOOC Research Institute, Beijing 100028, China

Energies, 2024, vol. 17, issue 5, 1-23

Abstract: The objective of this study is to construct a refined microscopic transport model that elucidates the transport mechanisms of gas flow within micro-nano pores and fractures. The collective impact of various microscopic transport mechanisms was explained through the apparent permeability model, specifically related to gases such as methane and carbon dioxide, within the shale matrix. The apparent permeability models, taking into account microscopic transport mechanisms such as slippage flow, Knudsen diffusion, transition flow, and surface diffusion, were established individually. Subsequently, the influencing factors on apparent permeability were analyzed. The results demonstrate that the apparent permeability of the shale reservoir matrix is significantly influenced by pore pressure, temperature, pore size, and total organic carbon (TOC). As pressure decreases, the apparent permeability of Knudsen diffusion and surface diffusion increases, while the apparent permeability of slippage flow decreases. In addition, the apparent permeability of the reservoir matrix initially decreases and then increases. With increasing temperature, the apparent permeability of slippage flow, Knudsen diffusion, and surface diffusion all increase, as does the apparent permeability of the reservoir matrix. As pore size increases, the apparent permeability of surface diffusion and Knudsen diffusion decreases, while the apparent permeability of slippage flow and the reservoir matrix increases. Furthermore, an increase in TOC leads to no change in the apparent permeability of slippage flow and Knudsen diffusion, but an increase in the apparent permeability of surface diffusion and the reservoir matrix. The model presented in this paper enhances the multi-scale characterization of gas microflow mechanisms in shale and establishes the macroscopic application of these micro-mechanisms. Moreover, this study provides a theoretical foundation for the implementation of carbon capture, utilization, and storage (CCUS) in shale gas production.

Keywords: micro-nano pore; shale gas; carbon dioxide; microscopic transport mechanism; apparent permeability (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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