Water-Shutoff Treatment in Wells With Single-String Multizone Completion Intervals (Brownfields)
Notice bibliographique
Résumé
Abstract Due to the stacked nature of reservoirs in the Niger Delta, the predominant completion types are dual-string multizone and single-string multi-zone completions. These designs have been adopted to reduce the number of infill wells required for field development. However, they come with a disadvantage in regard to carrying out a successful intervention when water break through occurs. Water breakthrough and high basic sediments and water (BS&W) are problems associated with fields having strong aquifer drive mechanisms. As a result, most exploration and production companies have learned to manage water production up to a tolerable limit, which is dependent on the water handling capacity of the installed facilities and also the economic cutoff limits for the wells in question. The reason for this type of water management is the lack of confidence in the water shutoff remedial operations. From a survey carried out in the early 90s, it was estimated that only 35% success was achieved worldwide in water shutoff remediation. This low success rate is due to poor diagnosis, wrong selection of water shutoff solutions, and how complicated the well completion is with respect to the zone of interest to be treated. Field X, 12, which consists of a large gas cap and a 100-ft total vertical depth (TVD) oil column, was developed with the single-string multizone completion design. Due to the presence of a strong aquifer in this field, water production started early and some of the wells were shut-in due to lift problems associated with the water production. A sidetrack option was considered as a means of bringing these wells back on production, but was not used because of the absence of a gas gathering facility for the field. As a result of production decline and lack of infill opportunities, cement-water shutoff and re-perforation intervention in the wells was adopted. The objective of the cement-water shutoff was to ensure that the perforations, which were flushed, were completely sealed off and isolated and subsequently re-perforated shallower. After slurry placement and squeezing, it is important to ensure that a good cement job has been performed. Operationally, the top of cement (TOC) is tagged using slick-line in a vertical or deviated well. If the TOC is not at the theoretical depth, then a top-up job is carried out with additional slurry. On the other hand, if the TOC is at the theoretical depth, then a pressure test is performed to confirm that the perforations are squeezed off. For intervals behind the sleeve as in the case of Field X, ascertaining the TOC is technically impossible because the perforations are behind the production tubing. For such single-string selective completions, only a pressure test can be performed to confirm that the perforations are squeezed off. This paper addresses the planning, operational and the learning from the through-tubing water shutoff campaign successfully carried out on wells with single-string multizone completions.
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 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 ».