Littérature scientifique sur le sujet « Ecoulement multiphasique en milieux poreux »
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Thèses sur le sujet "Ecoulement multiphasique en milieux poreux"
Fiorentino, Eve-Agnès. « Phénomènes électrocinétiques et transport multiphasique en milieux poreux ». Thesis, Strasbourg, 2016. http://www.theses.fr/2016STRAH008/document.
Texte intégralThe electrokinetic coefficient is simulated in a large range of salinities using the Lattice Boltzmann method in a 2-D channel. The effect of permittivity and viscosity is discussed. The validity of the Helmholtz Smoluchowski equation using strong zeta potentials is assessed. A model of bulk fluid conductivity is derived, taking into account the local variations of conductivity which have a significant impact in the presence of polyvalent counterions. Extended to unsaturated conditions, the model shows that the electrical charge density associated to the air-water interface is a key component. The coefficient shows a non monotonous behaviour, with an enhancement compared to the saturated state. The magnitude of this enhancement depends on the dynamic state of the bubbles, moving or entrapped. The multiphase transport aspect is associated to a numerical study of the influence of the sample geometry on the measurement of the capillary pressure / saturation relationships used in hydrology
Ha, Quoc Dat. « Modélisation multiéchelle du couplage adsorption-transport-mécanique dans les réservoirs de gaz de charbon : récupération assistée par injection de CO₂ ». Electronic Thesis or Diss., Université de Lorraine, 2022. http://www.theses.fr/2022LORR0194.
Texte intégralCoal seam gas is an energy resource whose exploitation can be enhanced by injectingcarbon dioxide (CO₂), thus combining the production of methane (CH₄) and the storage of carbon dioxide produced by its combustion. The structure of the reservoir is considered to be a double-porosity medium with natural fractures (cleats) and a matrix containing a solid phase and nanopores (less than 2 nm in size) where the gas is stored by adsorption on the solid wall. CO₂ is more easily adsorbed than CH₄. A multiscale theoretical model combining adsorption, transport and reservoir poro-mechanics is developed. At the smallest scale, the gas molecules are considered as hard spheres interacting through a Lennard-Jones potential. A new numerical method uses Density Functional Theory (DFT) and Fundamental Measure Theory (FMT) to calculate the distribution of molecular densities of a mixture of gases for any nanopore geometry. The solid wall exerts an external potential that is repulsive at very short distances and attractive at longer distances on the gas molecules. From the molecular distributions of the gases, the solvation force exerted by the fluid phase on the surface of the nanopores is precisely calculated. The asymptotic homogenization method is performed to upscale the nanopore-scale model and to obtain the response of the coal matrix at the microscale. The Biot poroelastic model is modified by the solvation force, which acts as the main factor governing matrix swelling or contraction. The average mass conservation equations for the two gases (CH₄ and CO₂) in the matrix take into account adsorption phenomena characterized by partition coefficients and an effective Knudsen-type diffusion. A second homogenization aims at obtaining the macroscopic law at the reservoir scaleby combining the cleats network and the solid matrix. The joint stiffness at the matrix-cleats interface is characterized by the hyperbolic Barton-Bandis law, which modifies the effective stiffness and the permeability of the reservoir. After homogenization, the reservoir is a heterogeneous and anisotropic medium due to the structure of the cleats and the spatial variation of the fluid pressure. A macroscopic average equation for gas diffusion in the matrix and gas-water transport in the cleats is developed by considering the mass exchange between the matrix and the cleats governed by the Warren and Root approximation. Numerical simulations illustrate the crucial correlation between gas pressure distributions, cleat opening and reservoir stiffness. CO₂ injection significantly improves CH₄ production and enables a underground storage of CO₂, which contributes to reducing green-house gas emissions
Pfertzel, Agnès. « Sur quelques schemas numeriques pour la resolution des ecoulements multiphasiques en milieu poreux ». Paris 6, 1987. http://www.theses.fr/1987PA066193.
Texte intégralCochard, Thomas. « Injection de tensioactif pour la récupération assistée du pétrole : implication sur les lois régissant les écoulements eau-hydrocarbure-tensioactif en milieu poreux ». Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066647/document.
Texte intégralThe main objective of the PhD is to study experimentally the oil mobilization using surfactant in a porous media below the residual oil saturation. At the residual oil saturation, the oil network is disconnected and organized in ganglia of different sizes and shapes all along the sample. This residual oil is difficult to produce in the classical conditions of water flooding because of capillary trapping created by the interfacial tension between oil and water. Injection of surfactant is able to mobilize the remaining oil at flow rates consistent with the real case of an oil mature reservoir. The use of surfactant allows lowering the interfacial tension by several orders of magnitude, towards ultra-low values (10-3 mN/m), strongly decreasing the capillary forces and so, mobilizing the oil. The first main study of the PhD work was to characterize the displacement of the surfactant injected in a sandstone sample in monophasic conditions (without oil). Breakthrough curves have been analyzed in term of dispersivity and adsorption. Experiments have shown that a better way to model the surfactant transport is to use a Langmuir kinetic adsorption model. For the diphasic case, we have developed a microfluidic 2D system with a random pore geometry of controlled conditions. The experiments are based on the injection of a small ganglia through a central channel, then, a surfactant flood is generated. The aim is to see how ganglia are displaced within the micromodel. New mechanisms have been identified and a way to model those phenomena has been proposed. A better understanding of surfactant and oil transport in porous media is key for chemical enhanced oil recovery processes
Amaziane, Brahim. « Homogénéisation et Modélisation Numérique d'Ecoulements en Milieux Poreux Hétérogènes. Applications à des Problématiques Energétiques et Environnementales ». Habilitation à diriger des recherches, Université de Pau et des Pays de l'Adour, 2005. http://tel.archives-ouvertes.fr/tel-00010339.
Texte intégralZitha, Pacelli. « Ecoulement non-stationnaire de polymeres hydrosolubles dans les milieux poreux ». Paris 6, 1994. http://www.theses.fr/1994PA066717.
Texte intégralCochard, Thomas. « Injection de tensioactif pour la récupération assistée du pétrole : implication sur les lois régissant les écoulements eau-hydrocarbure-tensioactif en milieu poreux ». Electronic Thesis or Diss., Paris 6, 2017. http://www.theses.fr/2017PA066647.
Texte intégralThe main objective of the PhD is to study experimentally the oil mobilization using surfactant in a porous media below the residual oil saturation. At the residual oil saturation, the oil network is disconnected and organized in ganglia of different sizes and shapes all along the sample. This residual oil is difficult to produce in the classical conditions of water flooding because of capillary trapping created by the interfacial tension between oil and water. Injection of surfactant is able to mobilize the remaining oil at flow rates consistent with the real case of an oil mature reservoir. The use of surfactant allows lowering the interfacial tension by several orders of magnitude, towards ultra-low values (10-3 mN/m), strongly decreasing the capillary forces and so, mobilizing the oil. The first main study of the PhD work was to characterize the displacement of the surfactant injected in a sandstone sample in monophasic conditions (without oil). Breakthrough curves have been analyzed in term of dispersivity and adsorption. Experiments have shown that a better way to model the surfactant transport is to use a Langmuir kinetic adsorption model. For the diphasic case, we have developed a microfluidic 2D system with a random pore geometry of controlled conditions. The experiments are based on the injection of a small ganglia through a central channel, then, a surfactant flood is generated. The aim is to see how ganglia are displaced within the micromodel. New mechanisms have been identified and a way to model those phenomena has been proposed. A better understanding of surfactant and oil transport in porous media is key for chemical enhanced oil recovery processes
Chraïbi, Mehdi. « Modélisation de l'expansion de gaz dissous dans les huiles lourdes en milieu poreux ». Paris 6, 2008. http://www.theses.fr/2008PA066026.
Texte intégralId, Moulay Mohamed. « Simulation numérique 3D d'Écoulement Multiphasiques Réactifs en Milieux Poreux ». Thesis, Pau, 2019. http://www.theses.fr/2019PAUU3015.
Texte intégralReactive transport modeling is used in many energy and environmental applications related to subsurface flows. Modeling such problems leads to a highly nonlinear system of PDEs coupled with algebraic or ODEs. Two types of approaches for the numerical solving of reactive transport problems are widely used in the literature. One is the operator-splitting approach which consists in splitting the flow and reactive transport problems. These latter are solved sequentially at each time step. The other strategy is based on the fully coupled approach in which the entire system is solved simultaneously. The goal of the PhD thesis is the development of a fully coupled fully implicit finite volume scheme for numerical modeling of single and two-phase multicomponent flows with reactive transport in porous media. New reactive transport modules will be implemented in DuMuX, a free and open-source simulator for flow and transport processes in porous media. Numerical simulations for 2D and 3D including benchmark tests and high performance computing will be performed to validate the modules
Skachkov, Sergey. « Modèle macroscopique de la dispersion diphasique en milieux poreux et fracturés ». Thesis, Vandoeuvre-les-Nancy, INPL, 2006. http://www.theses.fr/2006INPL064N/document.
Texte intégralThe objective of the thesis is to develop the homogenized model of a two-phase flow through a porous and fractured medium by highlighting the dynamic mixing between the phases, caused by the medium heterogeneity. Attention is focused on the influence of the capillarity. The two-scale homogenization is applied. The mixing is manifested in form of the hydrodynamic dispersion and renormalized advection. The dispersion tensor, determined by the cell problem, is a nonlinear function of saturation, flow velocity, viscosity ratio and capillary number. For a fractured medium the method of streamline configurations was advanced for a two- phase case. This method enables to obtain the dispersion tensor and the effective permeability in analytical form for periodic fractured networks or in semi-analytical form for random networks. The simulation of two- phase displacement based on the new model is performed