CO2-kerogen interaction dominated CO2-oil counter-current diffusion and its effect on ad-/absorbed oil recovery and CO2 sequestration in shale

•CO2-kerogen interaction dominated counter-current diffusion is investigated.•Molecular models of hydrocarbons extraction from kerogen using CO2 are constructed.•Effects of pressure, temperature, hydrocarbon, and type of kerogen are analyzed. The affinity of CO2 to kerogen represents an opportunity...

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Bibliographic Details
Published in:Fuel (Guildford) 2021-06, Vol.294, p.120500, Article 120500
Main Authors: Zhao, Xinyi, Sang, Qian, Li, Yajun, Liu, Huimin, Dong, Mingzhe
Format: Article
Language:English
Subjects:
Carbon dioxide
Carbon dioxide fixation
Carbon sequestration
CO2 sequestration
Counter-current diffusion
Diffusion
Diffusion effects
Enhanced shale oil/gas recovery
Formations
Gas recovery
Hydrocarbons
Kerogen
Kerogen-CO2 interaction
Molecular dynamics
Molecular dynamics simulation
Molecular modelling
Oil
Oil recovery
Oil shale
Pressure effects
Shale
Shale formations
Shale gas
Shale oil
Shales
Storage capacity
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Summary:•CO2-kerogen interaction dominated counter-current diffusion is investigated.•Molecular models of hydrocarbons extraction from kerogen using CO2 are constructed.•Effects of pressure, temperature, hydrocarbon, and type of kerogen are analyzed. The affinity of CO2 to kerogen represents an opportunity to increase shale oil/gas recovery using CO2, and as well represents great potential for CO2 sequestration in shale formations. In this study, the CO2-kerogen interaction dominated counter-current diffusion was investigated using molecular dynamics simulation. Molecular models of ad-/absorbed hydrocarbons extraction from kerogen using CO2 were constructed, and the CO2-hydrocarbon counter-current displacement processes were simulated. Results showed that the stronger interaction between kerogen and CO2 than that between kerogen and hydrocarbons results in a spontaneous counter-current diffusion process. That is, the ad-/absorbed hydrocarbons in kerogen can effectively be extracted out and CO2 can flow into and be stored in kerogen simultaneously. Effects of pressure, temperature, hydrocarbon, and the type of kerogen on the efficiency of hydrocarbon extraction, and CO2 storage capacity were analyzed. Further, in field applications, methods of evaluating the enhanced hydrocarbon recovery and the CO2 storage capacity of shale formations were proposed. Results obtained from this study provide guidance for enhancing shale oil/gas recovery using CO2 and for CO2 sequestration in shale formations.
ISSN:0016-2361
1873-7153
DOI:10.1016/j.fuel.2021.120500