Practical Data Mining and Artificial Neural Network Modeling for SAGD Production Analysis
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Notice bibliographique
Résumé
Abstract Quantitative evaluation of steam-assisted gravity drainage (SAGD) performance of heterogeneous reservoir is important for reservoir management and optimization of development strategies for oil sand operations. Although conventional commercial simulators are capable for detailed appraisal SAGD recovery performance, they are usually deterministic and computationally-demanding. Artificial intelligence approaches can be employed as a complementary tool for production forecast and pattern recognition of highly non-linear relationships between system variables. In this paper, a comprehensive dataset, consisting of petrophysical log measurements, production and injection profiles is assembled from various publicly available sources, encompassing ten different SAGD operating fields with approximately two hundred well pairs. Only fields with complete data records are selected. Artificial neural network (ANN) is employed to facilitate the production performance analysis. Predicting (input) variables that are descriptive of reservoir heterogeneities and operating constraints, including log-derived petrophysical parameters, dimensionless shale index, effective numbers of producers and injectors for a given well pair, total production time and cumulative steam injection, are formulated, while parameters pertaining to cumulative production and steam-to-oil ratio are considered as prediction (output) variables. Principal components analysis (PCA) is performed to reduce the dimensionality of the input variables, improve prediction quality and limit over-fitting. Clustering analysis is integrated to identify internal groupings among data. Finally, statistical analysis is conducted to study the influences of data uncertainty because of limited size of field dataset and imprecise log-interpretation criteria, together with model parameter uncertainty due to learning algorithm and initialization on the final ANN predictions. Workflows involving Monte Carlo and bootstrapping methods are applied successfully. A comprehensive uncertainty analysis using an actual SAGD dataset is a novel contribution. The modeling results are demonstrated to be both reliable and acceptable. This paper demonstrates the combination of artificial-intelligence approaches and data-mining analysis can be implemented in a practical manner to analyze large amount of field data, which is often prone to uncertainties and errors, with high reliability and feasibility. Considering that many important variables such as bottom-hole pressures, PVT properties, permeability measurements, multi-phase flow functions and thermal conductivities are typically unavailable in the public domain and, hence, are missing in the dataset, this work demonstrates how practical data-driven analysis approaches can be tailored to construct models capable of predicting SAGD recovery performance from only log-derived and operational variables. Another advantage of the proposed approach is that it can be updated when new information is obtained.
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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 | 0,001 | 0,001 |
| 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 découle