Investigating the Influence of Pore Shape on Shale Gas Recovery with CO2 Injection Using Molecular Simulation

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 g...

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Bibliographic Details
Published inEnergies (Basel) Vol. 16; no. 3; p. 1529
Main Authors Zhou, Juan, Gao, Shiwang, Liu, Lianbo, Jing, Tieya, Mao, Qian, Zhu, Mingyu, Zhao, Wentao, Du, Bingxiao, Zhang, Xu, Shen, Yuling
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.02.2023
Subjects
Adsorption
Carbon
Carbon dioxide
CO2 sequestration
Competition
Drawdown
Efficiency
Emissions
Emissions control
Experiments
gas adsorption
Gas recovery
Graphene
Greenhouse gases
Hydrocarbons
Injection
Methane
molecular simulation
pore shape
Pores
Shale
Shale gas
shale gas recovery with CO2 injection
Shape effects
Simulation
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Summary: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 CO2 and CH4 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 CO2-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 CH4 during the pressure drawdown process. Concurrently, this makes the CO2 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.
ISSN:1996-1073
1996-1073
DOI:10.3390/en16031529