Study of Nanoparticle Retention in Porous Media - A Perfect Sink Model
E.R. Abdelfatah, K. Kang, M. Pournik, B. Shiau and J. Harwell
Event name: IOR 2017 - 19th European Symposium on Improved Oil Recovery
Session: Novel IOR/EOR Technologies
Publication date: 24 April 2017
Info: Extended abstract, PDF ( 1.15Mb )
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Physicochemical interaction between the nanoparticles and the pore walls can cause significant retention of nanoparticles. The objective of this paper is to study nanoparticles retention when there is no energy barrier between the nanoparticles and rock surface. In this case, the double layer repulsion doesn’t exist, that nanoparticles retention depends on the diffusion coefficient of the nanoparticles and the thickness of the DLVO layer that mainly contributed by van der Waals attractive force. Perfect sink model is adjusted to calculate the rate of deposition of nanoparticles. Deposited nanoparticles could be released from the surface by physical perturbations. The kinetics of mobilization was analyzed by torque balance applied on a nanoparticle adhered to a flat surface in a moving fluid. Surface roughness is an important parameter in initiating particle to release from rock surface by affecting the length of the torque arms. The critical velocity for release acting at the center of nanoparticle can be identified. Numerical model was used to compare the theoretically calculated rates to experimental data. The model can be used to determine the fate of nanoparticles in porous media under different conditions of temperature, ionic strength, concentration, and pH that suppress the double layer repulsion.