Displacement of Colloidal Dispersions in Porous Media: Experimental & Numerical Approaches
The displacement of colloidal dispersions is of particular interest in many applications ranging from environmental issues to petroleum recovery. Natural porous media such as soils, aquifers or reservoirs contain colloidal particles of different nature (bacteria, viruses, clay, metal complexes …). Colloids can act as vehicles for micro organisms’ transport in aquifers causing danger for human health. In petroleum recovery techniques, water containing colloids is sometimes injected and their release and adsorption may alter the petrophysical properties of reservoirs causing their damage. This talk focuses on the study of colloid transport in porous media under different hydrodynamic and physicochemical conditions (pH, salinity) using both experimental and numerical approaches. Typical laboratory experiments consist in the injection of a colloidal dispersion of a given concentration in a porous column. The analysis of the effluents after brine-flushing allows investigating the kinetics of release and adsorption of colloids inside the porous medium. In-situ investigations are performed either by post-mortem destructive methods or by using more sophisticated non-destructive methods. Moreover, a first approach to model these processes consists in solving the appropriate convection-dispersion-reaction equations involving macroscopic properties. Although this gives valuable qualitative insight on the displacement mechanisms, a more detailed study at the pore-scale is needed. Numerical approaches have been used at the pore-scale to study the displacement of colloidal particles. As a first approximation, the transport of the mass center of the particles has been considered. More complete numerical methods have allowed to study the transport of a colloidal particle taking into account pore-surface roughness, hydrodynamic forces and particle/pore physicochemical interactions (DLVO forces monitored through the change of the ionic strength of the suspending fluid). An overview of our experimental and numerical studies will be presented.
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Communication avec acteSEFRIOUI, Nisrine; AHMADI-SENICHAULT, Azita; BERTIN, Henri; OMARI, Aziz (SFP, 2011)Les milieux poreux naturels, comme les sols ou les aquifères, contiennent des particules colloïdales naturelles dont le diamètre est inférieur au micron. Selon des conditions hydrodynamiques et géochimiques, celles-ci ...
Communication avec acteSEFRIOUI, Nisrine; AHMADI-SENICHAULT, Azita; BERTIN, Henri; OMARI, Aziz (2011)Natural porous media such as soils or aquifers, contain colloidal particles. Depending on geochemical and hydrodynamic conditions, they can be transported by water, developing high reactivity and mobility. They may therefore ...
Communication avec acteCISSOKHO, Malick; AHMADI-SENICHAULT, Azita; BERTIN, Henri; OMARI, Aziz; HAMON, Gérald (Society of Core Analysis, 2012)Several papers dealing with laboratory experiments or field operations confirm that, in some circumstances, low salinity waterflooding improves oil recovery. However, the basic mechanisms explaining the oil recovery ...
Article dans une revue avec comité de lectureSEFRIOUI, Nisrine; AHMADI-SENICHAULT, Azita; OMARI, Aziz; BERTIN, Henri (Elsevier, 2013)Transport of a solid colloidal particle was simulated at the pore scale in presence of surface roughness and particle/pore physicochemical interaction by adopting a “one fluid” approach. A code developed in our laboratory ...
Article dans une revue avec comité de lectureAHMADI-SENICHAULT, Azita; CANSECO, Vladimir; SEFRIOUI-CHAIBAINOU, Nisrine; OMARI, Aziz; BERTIN, Henri (Trans Tech Publications Ltd, 2016)The main objective of this paper is to give more insight on colloids deposition and re-entrainment in presence of a rough surface. Experiments on retention and release of colloids in a porous medium are first presented. ...