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

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.