Journal
CHEMICAL ENGINEERING JOURNAL
Volume 440, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.135796
Keywords
CO2 enhanced oil recovery; Replacement dynamics; Diffusion model; Micropore
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Funding
- National Natural Science Foundation of China [51836003]
- Sichuan Science and Technology Program [2019YFG0457]
- Program for HUST Academic Frontier Youth Team
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The study revealed that the microstructures of n-decane in micropores undergo significant changes with pore size, leading to oscillations in density and diffusivity. By proposing a diffusion model and analyzing different replacement mechanisms under varying pore sizes, the importance of micropores in CO2 enhanced oil recovery was demonstrated.
Nanopores are widely found in unconventional reservoirs, and the effect of nanoconfinement on CO2 enhanced oil recovery is still not fully understood. In this work, we have studied the kinetics of alkane replacement using CO2 in micropores (<2 nm) using molecular dynamics simulations. We found that the microstructures (number and density of adsorption layers) of n-decane in micropores changes dramatically with the pore size, leading to oscillations in the density and diffusivity of n-decane in the pores. A diffusion model was proposed to describe the replacement process of CO2 and analyze the different replacement mechanisms under different pore sizes. The structure change pattern and replacement efficiency were examined to show the superiority of microporosity in mining. This work paves a new way to explore the replacement mechanism in micropores, demonstrating the importance of micropores in CO2 enhanced oil recovery.
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