Freestanding hybrid riser system and method of installation
AssigneePetroleo Brasileiro S.A. - Petrobras
InventorsFrancisco Edward Roveri, Jose Mauricio Teixeira da Gama Lima
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Abstract
This invention relates to an improved freestanding hybrid riser system (FHRS) with new component configurations at the interfaces at the top (3) and bottom (5) ends of the vertical section of the riser (1) in comparison with configurations already installed by the industry. This proposed invention also describes a method for installation of the proposed FHRS which makes it possible to use vessels which are more available on the world market and therefore to bring about improved technical and operational gains.
Claims9
Improved freestanding hybrid riser system, characterised in that it has new configurations for the top (3) and bottom (5) ends of the vertical section of the riser (1) and these new configurations are tubular structures in the form of spatial portals known as the Top Riser Assembly (TRA) (16) and Bottom Riser Assembly (BRA) (18).
Method for installation of the improved freestanding hybrid riser system, characterised in that it uses a vessel equipped with dynamic positioning of the PLSV (22) type which can be used to install pipe using the Reel Method and another vessel of the crane and lay barge type—BGL1 (25) having a nominal capacity of 1000 tons to carry out the final installation activities.
Method for installation of the improved freestanding hybrid riser system according to claim 7, characterised in that the lower strengthening joint (7) is connected to the BRA (18) onshore and the assembly is transported to the place where the proposed FHRS is installed on the deck of the PLSV vessel (22).
Dependencies are inferred from the claim text.