Numéro : 2623 - Year : 2012

Seabed-surface connections for (very) large depth

Thomas DEGLAIRE, DORIS Engineering – Ingénieur Projet, Hydrodynamique et Ancrage – Paris

The oil Industry is always searching for new areas of development. As water depth of offshore field increased, production units have evolved: platforms are now always floating unit in deepwater.

Different concepts of all sizes and design have been studied and installed (FPSO, semi sub platform, TLP, SPAR…). They are all connected to the seabed with two types of links between bottom and sea surface:

• the mooring system is keeping the floating unit stationary ;

• production risers, water or gas injection risers, umbilical are used to exchange fluids

and information with seabed equipments

This paper aims at presenting the issues connected to these types of links between seabed and surface production units in deepwater. Actual technologies will be described. Most of them have been adapted from shallow water solutions, they have introduced new issues. The new solutions which are under development to increase the water depth will also be presented.

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