Investigations on Capillary and Viscous Displacement Under Ultrasonic Waves
Notice bibliographique
Résumé
Abstract In this paper, the influence of ultrasonic waves on capillary and viscous displacement of oil in porous media was investigated. Capillary (spontaneous) imbibition experiments were conducted using various fluid pairs such as air-water, mineral oil-brine, mineral oil-surfactant solution, kerosene-surfactant solution, and mineral oil-polymer solution. Berea sandstone and Indiana limestone cores were used as the matrix. Oil saturated cores were immersed into the aqueous phase and subjected to high intensity ultrasound from a specially designed ultrasonic chamber. The resulting recovery was recorded against time, and compared to a control experiment without ultrasound. A substantial increase in ultimate recovery was observed for most of the fluid pairs, with some improvements in recovery rate. To further investigate whether ultrasound induces a perturbation at the liquid-liquid interface of immiscible fluids, a series of Hele-Shaw type experiments were run. The resulting fingering pattern was strongly dependent on the interfacial tension of the fluid pair, and the injection rate. Ultrasound stabilized the fluid-fluid front of high interfacial tension fluid pairs, but generated larger instabilities when interfacial tension was low. Introduction For the past four decades, researchers have explored the use of acoustic energy to improve oil recovery that could potentially be an economic and environmentally-friendly alternative to current IOR methods. Beresnev and Johnson(1) provide an extensive review of the major developments of acoustic stimulation and its limitations. Guo et al.(2) discuss recent field results of seismic stimulation in China. Despite numerous promising field trials and patents, the exact mechanism behind ultrasonic stimulations is poorly understood. Most of the findings have been speculative with little experimental verification. The reason is two-fold. Firstly, the problem is very complex, involving a superposition of several different mechanisms. Secondly, it is not certain how far an acoustic wave propagates into the reservoir, or how such propagation occurs. Ultrasonic applications are limited to the near-wellbore area due to the high attenuation through the rock or fluids. As a consequence, most research in recent years has shifted to low energy, low frequency waves that can propagate several kilometres into the reservoir. However, because low frequency waves disperse into high-frequency harmonics as they travel through a porous medium, one would still expect ultrasonic waves to be present in the reservoir. An analytical treatment of compression and shear wave propagation in saturated porous media was first developed in two classic papers by Biot.(3, 4) . Acoustic waves are usually applied in three ways: pressure pulsing, down-hole vibration, and surface vibration. Applications range from enhanced oil recovery (EOR) to well stimulation, in situ upgrading, wellbore cleaning, and soil remediation. Acoustic stimulation is believed to positively contribute to the flow of oil in porous media by:Increasing the relative permeability of the phases;Reducing the adherence of wetting films onto the rock matrix, due to non-linear acoustic effects such as in-pore turbulence, acoustic streaming, cavitation, and perturbation in local pressures(5);Reducing surface tension, density, and viscosity as a consequence of heating by ultrasonic radiation(6);Altering of rheological properties of non-Newtonian fluids;
Récupéré en direct depuis OpenAlex et désinversé. Les résumés ne sont pas conservés dans cette base de données : les index inversés représentent 8,6 Go des 9,3 Go de texte de la base, et le serveur dispose de 13 Go libres.
Comment cette classification a été obtenuedéplier
Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,002 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule tête enseignante, pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».