EFFECT OF THE MAGNETIC IRON CORE-CARBON SHELL NANOPARTICLES IN CHEMICAL ENHANCED OIL RECOVERY FOR ULTRA LOW INTERFACIAL TENSION REGION
Palabras clave:enhanced oil recovery, nanoparticles, surfactant
Some of advantages of the simultaneous use of surfactants and nanoparticles in EOR processes are the increase in the efficiency of injection fluid for sweeping, the reduction of the adsorption of surfactant onto reservoir rock, the alteration of wettability and the reduction of water/crude oil interfacial tension. However, a large amount of nanoparticles required in chemical enhanced oil recovery (CEOR) processes might limit their application. Therefore, the main objective of this work is to synthesize, characterize and evaluate magnetic iron core-carbon shell nanoparticles that can be recovered and its impact on the reduction of surfactant adsorption on the porous media, and oil recovery at reservoir conditions. The additional benefit of the proposed method is that these nanoparticles can be recovered and re-used after the application due to its magnetic properties. The magnetic iron core-carbon shell nanoparticles were obtained following a new one-pot hydrothermal procedure and were carbonized at 900 °C using a teflon-lined autoclave. The core-shell nanoparticles were characterized using scanning electron microscopy (SEM), dynamic light scattering (DLS), N2 physisorption at -196 °C, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and magnetometry measurements. Magnetic iron core-carbon shell nanoparticles with an average particle size of 60 nm were obtained. The XPS spectrum corroborated that magnetic Fe (0) of the core was adequately coated with a carbon shell. The interfacial tension (IFT) was measured using a spinning drop tensiometer for a medium viscosity crude oil and a surfactant mixture. The minimum IFT reached was approximately 1×10-4 mN m-1 at a nanoparticles concentration of 100 mg L-1. At this concentration, the dynamic adsorption tests demonstrated that the nanoparticles reduce 33% the adsorption of the surfactant mixture in the porous media. The simultaneous effect of core-shell nanoparticles and the surfactant mixture was evaluated in a displacement test at reservoir conditions obtaining a final oil recovery of 98%.
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