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In this paper, the nanoclay particles were introduced as mobile adsorbents in oil reservoirs to adsorb the asphaltenes, reduce the viscosity and enhance the dispersion. The objective of this paper is experimental investigation of enhanced heavy oil recovery using in situ nanoparticles for the first time. Moreover, two thermal analysis methods (thermogravimetry and differential thermal analysis) were used to analyze the asphaltene content of residue hydrocarbons in the swept chambers in nano-assisted and conventional VAPEX processes. Experiments were carried out using Iranian heavy oil and propane: the setup consisted of two sand-packed cells; one packed only with glass beads as the oil matrix and the other with glass beads and modified montmorillonite as the nanoclay, while they had similar porosity and permeability. The content of deposited asphaltene in swept matrixes, the propagation pattern of vapor chambers in heavy oil matrixes, and the rates of solvent consumption and oil production were determined. The results elucidated that montmorillonite changed the matrix heterogeneity and led to forming enhanced breakthroughs, to increasing the interfacial surface of vapor/bitumen and to accelerating the oil production. It was found that not only was the rate of vapor injection diminished, but the heavy oil recovery was also markedly enhanced by 30(±4)%.Dans cet article, on decrit l’utilisation de particules de nanoargile en tant qu’adsorbant mobile dans des reservoirs d’huile afin d’adsorber les asphaltenes, reduire la viscosite de l’huile et renforcer la dispersion. L’objectif de cet article consiste en la description d’une etude experimentale de recuperation amelioree d’huile lourde par l’utilisation de nanoparticules in situ. Ce qui constitue une premiere. En outre, deux methodes d’analyse thermique (thermogravimetrie et analyse thermique differentielle) ont ete utilisees pour analyser la teneur en asphaltene des residus d’hydrocarbures dans les chambres balayees au cours des procedes VAPEX nano-assiste et conventionnel. Les experiences ont ete realisees en utilisant une huile lourde iranienne et du propane : le dispositif experimental consistait en deux cellules garnies de sable, l’une garnie uniquement avec des billes de verre en tant que milieu poreux et l’autre avec des billes de verre et de la montmorillonite modifiee en tant que nanoargile; les deux avaient la meme porosite et la meme permeabilite. La teneur en asphaltene depose dans les zones balayees, le profil de propagation des chambres de vapeur ainsi que les taux de consommation de solvant et de production d’huile ont ete determines. Les resultats ont mis en evidence que la montmorillonite a modifie l’heterogeneite du milieu poreux et a conduit a former des percees accrues, a augmenter la surface interfaciale solvant/bitume et a accelerer la production d’huile. Il s’est avere que non seulement le debit d’injection de solvant a ete diminue, mais que la recuperation d’huile lourde a egalement ete sensiblement accrue de 30 (±4) %

Improvement of Heavy Oil Recovery in the VAPEX Process using Montmorillonite Nanoclays