Régimes d'écoulement en milieu poreux et limite de la loi de Darcy

Chauveteau, G.; Thirriot, C.

doi:10.1051/lhb/1967009

Cited by 48 publications

(39 citation statements)

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“…The adsorption data currently reported allow the assumption that polyacrylamides are chiefly adsorbed by clays in rocks. Chauveteau (1973) points to a polymer retention of 0.11 mg/g in the case of an clayey sandstone, and 2 mg/g for pure clay. Assuming a 5-6~o proportion of clay in the sandstone, the value of 0.10 mg/g is attained if adsorption is taken into account merely on to the clay fraction of that rock.…”

Section: The Mechanism Of Adsorption Of Polyacrylamides On To Claysmentioning

confidence: 96%

Contribution to the Adsorption Mechanism of Acetamide and Polyacrylamide on to Clays

Stutzmann¹

1977

Clays and clay miner.

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Abstrac~While studying the retention of additives used in tertiary recovery of petroleum (waterflooding) on minerals present in a rock reservoir, an investigation has been undertaken into the adsorption mechanism of polyacrylamides on to clays. The adsorption of amides and polyacrylamides takes place exclusively on the external surfaces of the clay particles. The organic molecules are protonated on the surface and adsorbed by ionic forces. There is a linear relationship between the adsorption ratio and the polarizing power of the exchangeable cations of the clay mineral. The adsorption isotherms and the thermal analyses reveal the existence of two adsorption mechanisms: (i) a strong, irreversible adsorption, which corresponds to the formation of a monolayer of chemisorbed molecules, (ii) a more important adsorption of molecules retained by hydrogen bonding, which can be eliminated by heating at low temperature. The retention ratio in the irreversible process, which is practically identical both for acetamide and polyacrylamide, is low (3 mg/g). It depends on the external cation exchange capacity (CEC) of the mineral and increases with the surface area. The polyacrylamide adsorption depends on the physico-chemical characteristics of the macromolecule, more particularly on the CONH2/COOratio, which determines the extent of the carbon chain, and the molecular weight. The accessibility of the organic macromolecule to the clay particle is controlled by the preceding factors. The quantity of polyacrylamide irreversibly adsorbed by clay minerals is important in the context of the use of the polymer on a petroleum field. It may be reduced to a minimum by working at low concentrations with a weakly hydrolyzed polyacrylamide solution.

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Section: The Mechanism Of Adsorption Of Polyacrylamides On To Claysmentioning

confidence: 96%

Contribution to the Adsorption Mechanism of Acetamide and Polyacrylamide on to Clays

Stutzmann¹

1977

Clays and clay miner.

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“…where U r is a reference velocity taken usually as the intrinsic average velocity and l β a pore-scale characteristic length, one may distinguish various types of flow patterns [3]. In the limit Re → 0 (creeping flow) there is a robust consensus that, providing that the separation of scale assumption holds, the macro-scale model describing the momentum balance may be written under the form of a Darcy's law [1] such as…”

Section: One-phase Flowmentioning

confidence: 99%

One-Phase and Two-Phase Flow in Highly Permeable Porous Media

Davit

Quintard

2018

Heat Transfer Engineering

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“…Single-phase flow in porous media is generally modeled using Darcy's law (Darcy, 1856) which is assumed to be valid as long as the inertial forces are negligible compared to viscous forces (Lindquist, 1933;Schneebeli, 1955;Hubbert, 1956;Scheidegger, 1960;Chauveteau and Thirriot, 1967). The same approach is also used for flow in fractures.…”

Section: Single-phase Flowmentioning

confidence: 99%

Inertial Effects in Two-Phase Flow Through Fractures

Fourar

Lenormand²

2000

Oil & Gas Science and Technology - Rev. IFP

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Résumé -Effets inertiels dans les écoulements diphasiques en fractures -Différents modèles de description des écoulements diphasiques dans une fracture sont présentés : modèles du coefficient d'inertie, de « passabilité » et de Lockhart-Martinelli. Ces modèles sont ensuite utilisés pour interpréter des résultats expérimentaux obtenus avec un écoulement d'eau et d'air dans une fracture rugueuse. Il apparaît que les coefficients de perméabilités relatives classiques Kr (sans terme d'inertie) ne dépendent pas uniquement de la saturation mais également du rapport des débits des deux fluides. L'existence d'une famille de courbes des Kr en fonction de la saturation à débit élevé peut être considérée comme un critère de la manifestation des effets inertiels. En tenant compte des effets inertiels, les modèles du coefficient d'inertie et de passabilité permettent de décrire correctement les résultats expérimentaux. Cependant, ces modèles font intervenir quatre paramètres dont la détermination nécessite d'autres investigations. En revanche, le modèle de Lockhart-Martinelli ne comporte que deux paramètres et peut être utilisé pour prédire les résultats expérimentaux. Une relation empirique utilisée en génie chimique pour les milieux poreux permet de prédire les résultats expérimentaux avec un écart relatif moyen inférieur à 20 %, sans ajustement supplémentaire. Pour les trois modèles, l'utilisation du rapport des débits des fluides, plutôt que la saturation, donne de meilleurs résultats.Mots-clés : écoulement diphasique, perméabilités relatives, effets inertiels, Forchheimer, coefficient d'inertie, passabilité, milieu poreux, fracture. Abstract -Inertial Effects in Two-Phase Flow through Fractures

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Régimes d'écoulement en milieu poreux et limite de la loi de Darcy

Cited by 48 publications

References 0 publications

Contribution to the Adsorption Mechanism of Acetamide and Polyacrylamide on to Clays

Contribution to the Adsorption Mechanism of Acetamide and Polyacrylamide on to Clays

One-Phase and Two-Phase Flow in Highly Permeable Porous Media

Inertial Effects in Two-Phase Flow Through Fractures

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