Investigation on Wettability Alteration of Reservoir Rocks by Functionalized Silica Nanoparticles using Molecular Dynamics Simulations

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Sepehrinia, Kazem | 2015

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 47063 (06)
University: Sharif University of Technology
Department: Chemical and Petroleum Engineering
Advisor(s): Mohammadi, Aliasghar; Seyfkordi, Aliakbar
Abstract:
The properties of 3 nm-diameter fluorinated silica nanoparticles with different coverage percent of CF3 groups as water and oil repellents were investigated at the water-rock and decane-rock interface using molecular dynamics simulation. Simulating a pore of rock in presence of water and decane molecules separately, resulted in liquid bridging for both of liquids. The density profiles of liquids in the pore clearly show several highly ordered layers packing of the molecules close to the rock surface. Distribution of liquid molecules around the nanoparticles is much influenced with increasing CF3 groups on the nanoparticle surface. Results show that adsorption of functionalized silica nanoparticles on the rock surface can reduce density of liquid molecules at the interface. Comparing adsorption free energy of nanoparticles to the aggregation free energy of them predicts that nanoparticles adsorb preferably on the mineral surface
Keywords:
Wetting ; Molecular Simulation ; Condensate Blockage ; Reservoir Rock Characterization ; Water Blockage ; Functionalized Silica Nanoparticles

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