Petroleo Brasileiro S.a. - Petrobras

Francisco Edward Roveri

Jose Mauricio Teixeira Da Gama Lima

Roberto Rodrigues

Cezar Augusto Silva Paulo

Renato Brandão Mansano

Carlos Alberto Giacomin Pereira

A freestanding hybrid riser system (FHRS) and a method of installation which makes it possible to use vessels that are more available on the world market. The invention relates to a top riser assembly (TRA) having multiple, offset connection points such that a first bending moment is applied to the TRA by a buoyant unit, and an opposing bending moment is applied to the TRA by a flexible jumper.

Freestanding hybrid riser system

This invention relates to an improved freestanding hybrid riser system (FHRS) with new component configurations at the interfaces at the top () and bottom () ends of the vertical section of the riser () 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.

Freestanding hybrid riser system and method of installation

A free standing riser system includes a riser, a subsea intervention unit, and an umbilical line. The riser includes interconnected joints linked to one another, a lower-end of the riser being coupled to a wellhead and an upper-end of the riser enclosed in a buoy assembly, including a terminal, the riser being maintained in an erect, substantially vertical position. The subsea intervention unit is provided above the riser, and includes three connections: one connection to the terminal of the riser, one connection to a flexible jumper that is connected to a FPU, and one connection that provides a vertical conveyance to an intervention rig.

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Rio de Janeiro, Brazil

Francisco Edward Roveri