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Issue 40, 2020
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Interfacial CO2-mediated nanoscale oil transport: from impediment to enhancement

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Abstract

CO2-based enhanced oil recovery is widely practiced. The current understanding of its mechanisms largely focuses on bulk phenomena such as achieving miscibility or reducing oil density and viscosity. Using molecular dynamics simulations, we show that CO2 adsorption on calcite surfaces impedes decane transport at moderate adsorption density but enhances decane transport when CO2 adsorption approaches surface saturation. These effects change the decane permeability through 8 nm-wide pores by up to 30% and become negligible only in pores wider than several tens of nanometers. The strongly nonlinear, non-monotonic dependence of decane permeability on CO2 adsorption is traced to CO2's modulation of interfacial structure of long-chain hydrocarbons, and thus the slippage between interfacial hydrocarbon layers and between interfacial CO2 and hydrocarbon layers. These results highlight a new and critical role of CO2-induced interfacial effects in influencing oil recovery from unconventional reservoirs, whose porosity is dominated by nanopores.

Graphical abstract: Interfacial CO2-mediated nanoscale oil transport: from impediment to enhancement

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Supplementary files

Article information


Submitted
24 Jul 2020
Accepted
22 Sep 2020
First published
13 Oct 2020

Phys. Chem. Chem. Phys., 2020,22, 23057-23063
Article type
Paper

Interfacial CO2-mediated nanoscale oil transport: from impediment to enhancement

D. Y. Moh, C. Fang, X. Yin and R. Qiao, Phys. Chem. Chem. Phys., 2020, 22, 23057
DOI: 10.1039/D0CP03930F

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