Experimental and Numerical Investigation of the Impact of Asphaltene Stability on Interfacial Properties and the Hysteresis Behavior at the Interfaces
Notice bibliographique
Résumé
Abstract The mechanism of asphaltene precipitation and its effects on interfacial properties of oil-water systems at reservoir conditions has been actively researched, since it has significant impact on oil recovery and flow in the production network. In this work, we investigate the effect of pressure-depletion induced asphaltene precipitation on interfacial properties of live-oil, brine and quartz system; and present experimental observations on hysteresis of contact angle after aging at high pressure high temperature (HPHT) conditions. The experimental method is based on pendant drop-shape method utilizing high-resolution camera for quantitative image analysis and high-resolution digital pressure transducer in a HPHT fluid cell. The cell temperature was controlled with an accuracy of ±0.1°C. The contact angle with quartz was measured in presence of de-ionized water as surrounding medium. The experiments were started at a pressure higher than asphaltene onset pressure (AOP) and decreased below AOP in multiple discrete stages to cause asphaltene precipitation. At each pressure stage, sufficient time was given to stabilize the contact angle caused by aging and/or asphalting precipitation, and the change was recorded. Experimental contact angle data for a system containing a live oil, brine and quartz is presented at various pressures capturing the AOP. Under isothermal condition and at a pressure above AOP, the contact angle decreases with time until stabilization implying that it is a transient process. At sequential steps, the time to achieve the equilibrium value decreases. In this study, we experimentally show that the contact angle decreases with pressure. However, an evident sharp jump is observed near the vicinity of AOP point, signifying the effect of asphaltene precipitation, especially at the three phase (quartz/oil/water) interfaces. present the experimental data of interfacial tension (IFT) between live oil and water, and study the interfacial tension (IFT) trend reversal with supplemental IFT measurements before and after asphaltene precipitation. utilize the solubility-parameter approach for asphaltene modeling to predict asphaltene precipitation from live oil at various pressures below AOP but above the saturation pressure (Psat < P < AOP). relate the amount of precipitation with change in IFT that may enable the model to predict the change in interfacial properties (IFT, contact angle) at various pressure, temperature conditions, and other oils. Despite asphaltene effects on wettability alteration have been proposed, this is the first experimental evidence that pressure-depletion driven asphaltene precipitation alters the contact angle at realistic reservoir conditions (HPHT, live oils), including hysteresis in contact angle and IFT reversal. These data can be used as basis to establish the benchmark data, model calibration for managing and preventing/remediation asphaltene problems, and to design the proper facility and operating conditions for efficient recovery and operational processes.
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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 | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,002 |
| 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 ».