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We present Molecular Dynamics (MD) simulations of the imbibition process in nanopores in  case of two different mechanisms of the wettability modification. We compare the  imbibition of an aqueous surfactant solution into an oil-wet pore driven by surfactant  adsorption onto the oil-wet rock surface (coating mechanism) and the imbibition of an  aqueous surfactants solution driven by surfactants removing the contaminant molecules from  the originally water-wet surface (cleaning mechanism). Our results show qualitative  difference in the imbibition dynamics in these two cases and indicate that MD simulation  is a useful tool to investigate details of the imbibition mechanisms at the pore scale  with direct implications for Enhanced Oil Recovery (EOR) operations.Nous presentons des simulations de Dynamique Moleculaire (DM) du processus d’imbibition  dans des nanopores dans le cas de deux mecanismes differents de modification de  mouillabilite. Nous comparons l’imbibition d’une solution aqueuse d’agent tensioactif dans  un pore mouille d’huile entrainee par une adsorption d’agent tensioactif sur la surface de  roche mouillee d’huile (mecanisme de revetement) et l’imbibition d’une solution aqueuse  d’agent tensioactif entrainee par des agents tensioactifs eliminant les molecules  contaminantes de la surface originellement mouillee d’eau (mecanisme de nettoyage). Nos  resultats montrent une difference qualitative en matiere de dynamique d’imbibition dans  ces deux cas et indiquent que la simulation de DM constitue un outil utile pour etudier  les mecanismes d’imbibition a l’echelle des pores avec des implications directes pour des  operations de recuperation renforcee d’huile (EOR, Enhanced Oil  Recovery)

Molecular Dynamics Simulation of Spontaneous Imbibition in Nanopores and Recovery of Asphaltenic Crude Oils Using Surfactants for EOR Applications