Subsea 7 Do Brasil Servicos Ltda

Subsea 7 Do Brasil Servicos Ltda Niteroi

Marcio Nogueira Barcellos

Luiz Carlos De Lemos Junior

Andre Ramiro Amorim

Daniel Sahonero Rodrigues

Marcelo Aguiar Camara

João Luiz Vaz Coelho

Flavio Lage Bormann

Francisco Carlos De Souza Santos

Andre Azevedo

Jaime Andres Berrio Henao

Danilo De Hollanda Fernandes

Nelson Bittar Romeu

A method of installing a subsea riser includes placing an elongate negatively-buoyant support on the seabed and, when laying the riser on the seabed, guiding a riser portion onto the support to extend along and be cradled by the support. A hogbend region of the riser is then formed by conferring positive buoyancy on the support to lift the support and the riser portion away from the seabed. An element of the support includes a riser support disposed in a longitudinally extending open-ended gap between buoyancy volumes disposed on opposite sides of the gap. Coupling formations such as hinge portions can couple the element to a like element. When so coupled, the gaps of those elements align to define an upwardly opening, longitudinally extending groove to receive the riser.

Installation of subsea risers

A hang-off insert for hanging-off a flexible elongate subsea element from a surface vessel has a circular loop that includes circumferentially-spaced support segments. Collectively, the segments define a substantially planar support face of the insert and have respective radially inner faces that define an inner radius of the loop. The radially inner faces of the support segments can be positioned at various radial positions to determine the inner radius of the loop and hence to adapt the circumference of the loop to suit different diameters of elongate subsea elements. With the hang-off insert supported by a hang-off structure of the vessel, a laterally-protruding hang-off feature of the elongate subsea element extending through the loop may be rested on the support face to transfer suspended weight loads to the hang-off structure.

Method of hanging-off flexible elongate elements during subsea operations, hang-off insert and link therefor

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Rio de Janeiro, Brazil

Marcio Nogueira Barcellos