HR: 16:00h
AN: H44D-01    [Abstracts]
TI: Deposition in two phase flow in porous media
AU: * Adler, P M
EM: padler@ccr.jussieu.fr
AF: Sisyphe-UPMC, 4 place Jussieu, Paris, 75252, France
AB: The study of dispersion and deposition of an active tracer in multiphase flow through a porous medium is a difficult topic which has not received much attention in the past though it has a lot of practical and fundamental interest. For instance, asphaltene flocculation implies its deposition on the solid walls and this has two effects. The first one is to change the wettability of the walls; if they are initially water wet, they may become oil wet. The second one is to reduce the pore space. In both cases, the flow properties of the porous medium are expected to be influenced. Our purpose was to develop a new tool to analyse these two effects; this new tool had to be constructed by integrating existing codes. First, the basic ingredients which are necessary for the determination of dispersion and deposition at the local scale are presented. The pore space can be generated by means of the method of reconstructed media (1). The instantaneous phase distribution and the velocity fields are computed by an Immiscible Lattice Boltzmann model (2). The solute dispersion is obtained by the Random Walk technique (3); its deposition at the walls is supposed to follow a first order reaction (4). Finally, the rules for the solid and/or wettability changes will be precised. The main results of our calculations can be summarized as follows. The possibilities of the code are demonstrated on a three-dimensional medium; the evolution of the solid space, of the wettability properties and of the phase configurations are illustrated; dramatic results are shown for the evolution of the relative permeabilities and of the capillary pressures. Then, various parameters are studied in a systematic way, such as the porosity, the partition coefficient, the diffusion coefficient, the saturation and the kinetic coefficients. Some concluding remarks end up this study. Ref: (1) Adler P.M., Jacquin C.G., Quibier J.A., 1990, Flow in simulated porous media, Int. J. Multiphase flow, 16, 691- 712. (2) Ginzbourg I., Adler P.M., 1995, Surface tension models with different viscosities, Transport Porous Media, 20 , 37-76. (3) Békri S. and Adler P.M., Dispersion in multiphase flow through porous media, Int. J. Multiphase Flow, 28, 665, 2002. (4) Békri S., Thovert J.-F. and Adler P.M., Dissolution of porous media, Chem. Eng. Sci., 50, 2765-2791, 1995.
DE: 0545 Modeling (4255)
DE: 1847 Modeling
DE: 1859 Rocks: physical properties
SC: Hydrology [H]
MN: 2007 Fall Meeting