Design and Implementation of the First Buoyed Steel Catenary Risers
Notice bibliographique
Résumé
Abstract This paper presents the design and implementation of buoyed steel catenary risers (SCR). Two 6" steel catenary risers, installed in November-December 2001, were designed to include 50,000-pounds of buoyancy per riser in 3,300 feet of water for Mariner Energy, Inc.'s King Kong/Yosemite field development in the Green Canyon area of the Gulf of Mexico. The risers are suspended from the Agip Petroleum "Allegheny" tension leg platform (TLP) where reduced riser loads were required for additional process equipment and safe TLP operation. Introduction The King Kong/Yosemite development consists of three subsea gas wells located in Green Canyon Blocks 472, 473 and 516 in water depths of 3,800 - 3,900 feet. The subsea wells are commingled at a manifold located in Green Canyon block 472 into two 7" production flowlines. These 7" flowlines transit approximately 15 miles to Green Canyon Block 254, in 3,300-foot water depth, where they transition to 6" SCRs to board the Agip Petroleum "Allegheny" mini Tension Leg Platform, (TLP). The field layout is pictured in Figure A-1. The riser locations near the platform are illustrated in Figure A-2. During the course of the riser design, and after order of riser pipe and titanium stress joints, it was discovered that the weight of additional process equipment and the planned SCRs placed the Allegheny TLP beyond its allowable load capacity. In order to maintain a safe load budget for the TLP and to account for future process equipment addition it was decided to reduce the total TLP load by 100-kips via buoyancy on the risers. The challenge involved making a buoyed riser system work within the constraints of a non-buoyed, simple catenary SCR. The buoyed riser design involved an iterative approach to optimize the riser and buoyancy to satisfy the requirements for design codes, S-Lay installation and project cost and schedule constraints. The position and characteristics of the buoyancy were important to produce a riser catenary that met project requirements and code stress and fatigue criteria. In the final configuration, each riser utilizes 271 separate, surface installed buoyancy modules applied over a continuous length of 800-feet, starting below the VIV strakes, to provide 50-kips of net buoyancy plus a 5% safety factor. The resultant riser has an arc length of 3,532-feet with a horizontal offset of 1028-feet at a departure angle of 8°. Figure A-3 illustrates the final riser configuration. The final profile of the riser is a shallow "S" exhibiting a slight double catenary. Analysis shows that, compared to a conventional SCR, the buoyed riser exhibits increased bending and dynamic stress in the sagbend. This results from the "lighter" SCR motion characteristics and the departure from the second catenary, best illustrated as a shorter horizontal offset to touchdown than conventional simple catenary SCRs. Riser stresses are managed by placement, distribution and size of buoyancy modules. Execution of this project demonstrates the viability of the buoyed SCR for deepwater developments and how this concept can be used to expand or enhance the capacity of floating production systems. This paper presents the design and implementation of the buoyed steel catenary risers (SCR) for the Mariner Energy, Inc., King Kong/Yosemite field development. Included is an overall description of the riser key parameters; design including static, dynamic, vortex induced and wave fatigue analyses; and installation experience. In the description of the static analysis, comparing and contrasting results of the original simple catenary SCR, the final buoyed SCR configuration and one of the iterative buoyed SCR configurations examined before selec
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 ».