Investigation and Observations on the Stability of Water-Oil Ratio WOR during Chemical Floods in Heavy Oil Reservoirs
Notice bibliographique
Résumé
Abstract Long periods of up to several years of production at a Water-Oil Ratio (WOR) at or close to 1 have been observed in polymer floods in heavy oil reservoirs in Western Canada. A similar behavior had been noted by some authors in waterflood projects in heavy oil; however, this has never been documented in chemical floods before. Such long periods of WOR stability at low values, with very unfavorable Mobility Ratios, are not expected from theory. The aim of this paper is to review chemical floods in heavy oil reservoirs in Canada to better understand this phenomenon and try and identify the potential mechanisms by investigating reservoir and operational factors. If the phenomenon can be controlled through adequate operational practices, it would allow to operate chemical floods under very favorable WOR conditions for long periods. The production data of hundreds of wells in 8 large scale polymer and ASP floods in heavy oil reservoirs in Western Canada has been reviewed to investigate the occurrence of periods of stable WOR close or equal to 1. A significant number of wells that display this kind of behaviour were identified and studied. The impact of Gas Oil Ratio, oil viscosity, injection rate and other factors was analysed to try and identify some potential factors causing the phenomenon. Long periods of WOR stability at or around 1 have been confirmed in 3 of the 8 chemical floods reviewed; 2 cases are polymer floods and 1 is a mixed polymer/ASP flood. The behaviour has been observed during primary, secondary as well as tertiary polymer flood. There appears to be a link with the injection and liquid production rates i.e. WOR stability occurs in a given range of rates; but no other obvious factors have been identified so far. The existence of long periods (up to several years) of WOR stability around 1 is documented for the first time in chemical floods in heavy oil reservoirs. This behavior is unexpected from theory and deserves further study; if it could be controlled through adequate operational practices, it would allow to operate chemical floods under very favorable WOR conditions for long periods.
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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 | 0,000 |
| 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 ».