In-situ preparation of Fe2O3 nanoparticles in low-perm porous media is not effective for the control of asphaltene-induced damage at low-drawdown production rates of reservoir oils
Paper ID : 1106-ICNS
mazaher Hayatdavoudi1, Negahdar Hosseinpour *2
1Institute of Petroleum Engineering, School of Chemical Engineering, College of Engineering, University of Tehran,Tehran, Iran
2Chemical/Petroleum Engineering, College of Engineering, University of Tehran, Tehran, Iran
Asphaltene in reservoir oils has detrimental contributions during the oil production. Emulsion stability, high viscosity, unfavorably changing the reservoir rock properties are induced in part by the asphaltene instability. Nanotechnology has emerged as a key solution. By in-situ synthesis of the nanoparticles in the reservoir oils, self-association of asphaltene is controlled. Following the preparation of stable emulsions of precursor iron salt aqueous solution in oil, Fe2O3 nanoparticles were synthesized in an autoclave at typical reservoir temperatures and high-enough pressures. In addition, two series of core-flooding experiments were performed using low-perm carbonate core plugs. The influence of the thus-prepared nanoparticles on the damage induced by the asphaltene precipitation and deposition was studied. Results indicate that the effective hydrocarbon permeability is reduced by 98.3 and 98.9% in the absence and presence of the nanoparticles. Therefore, no significant control of the formation damage is observed by the in-situ prepared nanoparticles. This may be attributed to the log-jamming of the water droplets as the disperse phase of the emulsions in the pore-throats, resulting in another form of damage by capillary phenomena. As a conclusion, the in-situ prepared nanoparticles are not effective for the control of asphaltene damage during low-drawdown production rates of the oils.
In-situ synthesis; In-situ oil upgrading; Asphaltene; Nanoparticles; Flow assurance
Status : Abstract Accepted (Poster Presentation)