Modelling of Injection Well Capacity with Account for Permeability Damage in the Near-Wellbore Zone for Oil Fields in Western Siberia
Notice bibliographique
Résumé
Abstract One of the key fundamental problems in using in jection wells to maintain the reservoir pressure for efficient roduction from oil and gas wells is the colmatation of the near-wellbore zone, which results in the permeability damage, and, hence, the decrease in the injectivity. In these cases one needs to increase the pumping pressure or introduce additional filtering systems on surface, which generally increases the cost of field development. For optimization of the flooding process, it is proposed to use a combined approach based on modeling of suspension filtration with account for colmatation of the near-wellbore zone and applying a cycling regime of injection. A 1D three-continua model is proposed for suspension filtration to describe the permeability damage in the near-wellbore zone of injection wells in the fields of Western Siberia. Governing equations are derived using the multi-continua approach. The carrier phase, as well as the particles, which are being transported and deposited, are described as three distinct continua in terms of field variables. The application of the multi-continua approach allows one to reduce the number of free parameters of the model. The model takes into account the effects of sedimentation (trapping) of particles in the pores (colmatation), mobilization of particles at the velocities higher than a certain threshold value. The model has gone through a thorough validation campaign against significant amount of experimental data with contamination of porous samples by suspensions (core flooding experiments) and mobilization of pre-seeded particles in sand packs. Experimental study of self-colmatation of cores produced from Vendian deposits in one of West Siberian oilfields during the injection of a particle-free fluid. It is found that at a fixed filtration rate, the permeability of rock cores decreases and levels off. An increase in filtration rate results in further decrease of the permeability. In order to reproduce the experimental data on self-colmatation, the three-continua model of filtration was modified to take into account two types of deposited particles: particles attached to pore walls, which are the source of migrating particles, and the particles plugging or bridging the pore throats, which reduce the permeability of the porous medium. The numerical simulations showed that the modified model allows to reproduce the self-colmatation of natural cores, the values of free parameters were found by tuning the model against theobtained experimental data. We carried out the simulations of distributions of reduced permeablity, concentration of suspended particles and the concentration of trapped particles in pores in the nearwellbore zone at continuous and periodic water flooding. It is found that there are periodic regimes of water injection, in which the permeability of the rock is not damaged. The study will be continued after the generalization of suspension filtration model to describe colmatation of a rock both by external and internal fines as well as the calibration of the model against data of experiments carried out using on natural cores.
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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 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,001 | 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 ».