NAPL disolution in an heterogeneous porous medium: experimental and numerical study
Communication sans acte
This study deals with the dissolution of a NAPL trapped in a water saturated heterogeneous porous medium (stratified medium with flow normal to the strata). The experimental study consists in injecting pure water in a stratified porous medium made of five strata of two different porous media wherein a pollutant (TCE) has been trapped under capillary forces. Pollutant concentration in effluent water is measured using a gas chromatography device, while local saturation is measured using a gamma ray attenuation apparatus. The experimental data show a slow dissolution of the pollutant at a concentration lower than the equilibrium concentration. This typical non equilibrium is attributed to the macroscopic heterogeneity of the porous medium and to the microscopic heterogeneity of the strata. A numerical study has been performed to analyse the experimental data. The non equilibrium physical model solved numerically allows a satisfactory description of the experimental data using correlations for the mass exchange coefficient of each medium similar to those reported in the literature. The macroscopic modelisation of dissolution in the stratified formation using the “equivalent homogeneous medium” approach has been explored. Although, a very good agreement between experimental and numerical data is observed using a macroscopic non-equilibirum model with adjusted effective properties, direct estimation of these properties remains rather complex.
Fichier(s) constituant cette publication
Cette publication figure dans le(s) laboratoire(s) suivant(s)
Visualiser des documents liés par titre, auteur, créateur et sujet.
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 ...
Conférence invitéeAHMADI-SENICHAULT, Azita; OMARI, Aziz; BERTIN, Henri (2015)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 ...
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 ...
What can be learnt about dispersivity from transport experiments in unsaturated double-porosity soils? Communication avec acteTRAN NGOC, T.D.; AHMADI-SENICHAULT, Azita; BERTIN, Henri (2017)Dispersivity is assumed to be an intrinsic property which characterizes the heterogeneity scale of porous media. When the medium is unsaturated by two fluid phases (water and air), dispersivity depends strongly on the ...
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 ...