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Title: Direct numerical simulation of pore-scale reactive transport: applications to wettability alteration during two-phase flow

Authors: Yan Zaretskiy; Sebastian Geiger; Ken Sorbie

Addresses: Institute of Petroleum Engineering, Heriot-Watt University, EH14 4AS, Edinburgh, UK. ' Institute of Petroleum Engineering, Heriot-Watt University, EH14 4AS, Edinburgh, UK. ' Institute of Petroleum Engineering, Heriot-Watt University, EH14 4AS, Edinburgh, UK

Abstract: We present a finite element – finite volume simulation method for modelling fluid flow and solute transport accompanied by chemical reactions in experimentally obtained 3D pore geometries. The advantage of the proposed methodology with respect to other pore-scale modelling approaches is that no simplifications regarding the geometry of the porous space are required and no approximations to the flow equations are introduced. We apply this method in a proof-of-concept study of a digitised Fontainebleau sandstone sample. We use the calculated velocity profile with the finite volume procedure to simulate pore-scale transport and diffusion of the adsorbing solute. We also demonstrate how analysis of the pore geometry can be used to identify the locations of oil during the two-phase flow and couple this with the reactive transport modeling to show how this procedure can be used to estimate the potential of the enhanced oil recovery techniques. [Received: March 31, 2011; Accepted: July 05, 2011]

Keywords: pore scale modelling; finite element method; FEM; finite volume method; Navier-Stokes equation; reactive transport; distance field calculation; wettability alteration; two-phase flow; simulation; solute transport; chemical reactions; 3D pore geometry; Fontainebleau sandstone; velocity profile; oil location; petroleum reservoirs; enhanced oil recovery.

DOI: 10.1504/IJOGCT.2012.046318

International Journal of Oil, Gas and Coal Technology, 2012 Vol.5 No.2/3, pp.142 - 156

Available online: 03 Apr 2012 *

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