Flexible riser pipe installation for conveying hydrocarbons

Details Flexible riser pipe installation for conveying hydrocarbons Flexible riser pipe installation for conveying hydrocarbons

E - Fixed Constructions

21

B

E21B 17/01 (2006.01)

Patent

CA 2676001

The invention relates to a riser pipe installation that comprises a flexible duct (10) of the non-bound type, the duct (10) being vertically arranged between a mechanical connection (7', 7', 44) with a submerged buoy (8) at the stub on the one hand, and a mechanical connection (6', 6', 6'') with the seabed (5) at the bottom on the other hand, wherein fluid connections (12, 30) are provided at the stub and at the bottom for connecting the riser pipe with surface equipment (3) on the one hand and bottom equipment (2) on the other hand; the bottom of the pipe is located at a depth of at least 1000 m where it is submitted to a computable maximum reverse bottom effect F, while the buoy is oversized in order to generate at the bottom of the riser pipe a reaction tension T higher than at least 50 % or even 100 % of the computable maximum reverse bottom effect F applied at the bottom of the pipe.

Dans cette installation de colonne montante réalisée avec une conduite flexible (10) de type non lié, la conduite (10) est disposée verticalement entre d'une part une connexion mécanique (7', 7'', 44) en tête avec une bouée immergée (8) et d'autre part une connexion mécanique (6', 6'', 6''') en pied avec le fond marin (5), des connexions fluidiques (12, 30) étant prévues en tête et en pied pour relier la colonne montante d'une part avec des équipements de surface (3) et d'autre part avec des équipements de fond (2); le pied de la colonne est à au moins 1000 m de profondeur où il subit un effet de fond inverse maximum calculable F et la bouée (8) est surdimensionnée pour entraîner en pied de la colonne montante une tension de réaction T supérieure à au moins 50%, voire 100% de l'effet de fond inverse maximum calculable F développé en pied de colonne.

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