Riser tensioning system

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 19/00 (2006.01)

Patent

CA 2383418

In a substructure (10) for a floating oil or gas production platform, an arrangement to tension a plurality of risers (16) extending from the sea bed up to the substructure, the arrangement comprising: a conventional hydraulic tensioner/heave compensator (17) for each riser, in which there is a soft spring formed by a piston cylinder combination acting against an accumulator, the heave compensators for the risers being disposed to compensate for vertical oscillations of relatively short period (e.g. from 1 second to about 5 minutes) between the risers and a vertically adjustable Xmas tree deck (18); and a vertical position adjustment system (21/22) capable of intermittent operation to adjust the vertical position of the Xmas tree deck (18) relative to the floating substructure (10) to compensate for longer term changes which would otherwise cause the individual riser's tension or stroke position to depart from its target value/range; the Xmas tree deck vertical position adjustment system being normally located in one particular position within its range of movement to compensate for the longer term changes.

La présente invention concerne une sous-structure (10) destinée à une plate-forme flottante de production de pétrole ou de gaz. Dans cette sous-structure, une installation sert à maintenir une pluralité de colonnes de montée (16) s'étendant du fond marin à la sous-structure, l'installation comprenant: un tendeur hydraulique/compensateur de pilonnement conventionnel (17) par colonne de montée, dans lequel se trouve un ressort souple formé par une combinaison piston-cylindre agissant contre un accumulateur, les compensateurs de pilonnement des colonnes de montées étant placés de manière à compenser les oscillations verticales de période relativement courte (par exemple de 1 seconde à environ 5 minutes) entre les colonnes de montée et le pont d'arbre de Noël (18) réglable verticalement; et un système de réglage de position verticale (21, 22) capable de réaliser par intermittence l'ajustage de la position verticale du pont d'arbre de Noël (18) par rapport à la sous-structure flottante (10) afin de compenser les changements à plus long terme qui pourraient sinon mettre les colonnes de montée sous tension de manière individuelle ou faire différer la position de course de sa valeur / plage de valeurs cible, le système de réglage de position verticale de pont d'arbre de Noël se trouvant en général dans l'une des positions particulières de la gamme de mouvements afin de compenser les changements à plus long terme.

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