Compositional Changes in Athabasca Bitumen During Air Injection into Mature SAGD Chambers - Observations from 3-D Large Scale Experiments
Notice bibliographique
Résumé
Abstract Air injection into mature SAGD chambers is a promising method to sustain steam chamber pressures while reducing steam-to-oil-ratios (SOR) and increasing oil production in SAGD late life. The feasibility of attaining and sustaining a high temperature combustion front when injecting air into a steam chamber has been recently demonstrated with a three-dimensional (3-D) large scale experiment. In order to effectively mobilize bitumen, bond scission reactions are required to occur between the injected oxygen and the bitumen. The highly effective combustion process is accompanied by thermal cracking reactions which often produce lighter oil fractions and coke. However, low temperature oxidation reactions or oxygen addition to the bitumen may occur if oxygen rates are not sufficient to sustain the combustion front which in turn could degrade the bitumen properties. This paper focuses on the compositional changes observed on Athabasca bitumen during air injection after SAGD in a 3-D large scale experiment. Changes in bitumen properties, as measured from produced and residual oil samples, such as density, viscosity, asphaltenes content and hydrocarbon cut point distribution are presented. The well configuration in the 3-D experiment consisted of two well-pairs located near the bottom corners of the rectangular model. At the end of the SAGD period, air was injected into one of the injection wells while fluids were produced from both wells in the well-pair located on the other end of the model. Oil properties from produced liquid samples, captured from the upper and lower production wells during the test, as well as extracted oil from selected post-test core samples were analysed and correlated with time and their location in the 3-D model, respectively. Fluid segregation and distinctive fluid properties were observed in the samples produced from the upper and lower producer wells. A significant portion of produced oil samples exhibited lower density, viscosity and asphaltenes content than the original bitumen indicating that oil upgrading took place during the test. Post-test core samples were analysed during the excavation or unpacking of the 3-D model and their weights, visual appearance and 3-D location were recorded. Properties of oil extracted from selected post-test core samples also indicated the presence of upgraded oil in the residual hydrocarbons. The asphaltenes content in selected residual oil samples remained similar to that of the original oil. Significant amounts of upgraded oil produced during the 3-D experiments highlights the potential added benefits of air injection into mature SAGD chambers.
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 machine sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Le volet Gemma est une étiquette directe du modèle pour chaque travail de la base, lue sur la notice réduite au titre. Le volet Codex est un classifieur appris des 10 348 étiquettes directes de Codex et calibré sur les taux pondérés de l'échantillon; les champs sans appui suffisant ne portent aucun appel Codex. Le mode candidate est l'union des deux volets; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont pas des étiquettes humaines.
Scores du classifieur distillé par catégorie (deux têtes)
| 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 | 0,000 |
| 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) | 0,001 | 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 source (Gemma direct ou Codex distillé), 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 ».