Investigating the Influence of Pore Shape on Shale Gas Recovery with CO 2 Injection Using Molecular Simulation

Juan Zhou (), Shiwang Gao, Lianbo Liu, Tieya Jing, Qian Mao, Mingyu Zhu, Wentao Zhao, Bingxiao Du, Xu Zhang and Yuling Shen
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Juan Zhou: National Key Laboratory of High-Efficiency Flexible Coal Power Generation and Carbon Capture Utilization and Storage, Huaneng Clean Energy Research Institute, Beijing 102209, China
Shiwang Gao: National Key Laboratory of High-Efficiency Flexible Coal Power Generation and Carbon Capture Utilization and Storage, Huaneng Clean Energy Research Institute, Beijing 102209, China
Lianbo Liu: National Key Laboratory of High-Efficiency Flexible Coal Power Generation and Carbon Capture Utilization and Storage, Huaneng Clean Energy Research Institute, Beijing 102209, China
Tieya Jing: National Key Laboratory of High-Efficiency Flexible Coal Power Generation and Carbon Capture Utilization and Storage, Huaneng Clean Energy Research Institute, Beijing 102209, China
Qian Mao: Institute of Technology for Nanostructures, University Duisburg-Essen, 47057 Duisburg, Germany
Mingyu Zhu: National Key Laboratory of High-Efficiency Flexible Coal Power Generation and Carbon Capture Utilization and Storage, Huaneng Clean Energy Research Institute, Beijing 102209, China
Wentao Zhao: National Key Laboratory of High-Efficiency Flexible Coal Power Generation and Carbon Capture Utilization and Storage, Huaneng Clean Energy Research Institute, Beijing 102209, China
Bingxiao Du: Huaneng Daqing Thermal Power Co., Ltd., Ranghulu District, Daqing 163159, China
Xu Zhang: Huaneng Daqing Thermal Power Co., Ltd., Ranghulu District, Daqing 163159, China
Yuling Shen: Huaneng Daqing Thermal Power Co., Ltd., Ranghulu District, Daqing 163159, China

Energies, 2023, vol. 16, issue 3, 1-11

Abstract: Carbon-dioxide-enhanced shale gas recovery technology has significant potential for large-scale emissions reduction and can help achieve carbon neutrality targets. Previous theoretical studies mainly focused on gas adsorption in one-dimensional pores without considering the influence from the pore geometry. This study evaluates the effects of pore shape on shale gas adsorption. The pure and competitive gas adsorption processes of CO 2 and CH 4 in nanopores were investigated using molecular simulations to improve the prediction of shale gas recovery efficiency. Meanwhile, quantitative analysis was conducted on the effects of the pore shape on the CO 2 -EGR efficiency. The results indicate that the density of the adsorption layer in pores is equally distributed in the axial direction when the cone angle is zero; however, when the cone angle is greater than zero, the density of the adsorption layer decreases. Smaller cone-angle pores have stronger gas adsorption affinities, making it challenging to recover the adsorbed CH 4 during the pressure drawdown process. Concurrently, this makes the CO 2 injection method, based on competitive adsorption, efficient. For pores with larger cone angles, the volume occupied by the free gas is larger; thus, the pressure drawdown method displays relatively high recovery efficiency.

Keywords: gas adsorption; shale gas recovery with CO 2 injection; pore shape; CO 2 sequestration; molecular simulation (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: 2023
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