Troll oil pipeline: High precision seabed preparation down to 540 m water depth
- A/S Jebsens ACZ, Gorinchem (Netherlands)
- Snamprogetti Spa, Fano (Italy)
- Statoil, Stavanger (Norway)
Oil and Gas Developments are finding their way to increasingly deep waters and complicated seabed topography, for which until recently the feasibility was doubted. Statoil`s Troll Oil pipeline Development Project is a typical example of such a project which is characterized by strong undulating seabed geometries, poor bearing capacities of the subsoil and water depths up to 540 m. By means of gravel supports and stabilization berms, removing soft soils at water depths up to 350 m and installation of concrete lateral supports, the seabed has been prepared to enable the Troll Oil pipeline to be laid without being overstressed and avoiding geotechnical instabilities of the subsoil. These seabed preparatory works were executed by means of the three Fallpipe Vessels operated by A/S Jebsens ACZ. The paper addresses the most recent developments in the execution of high precision seabed preparatory works, called Pre-lay Intervention Works, which are performed prior to laying of the pipeline. Special attention will be given to the required accuracy during construction/execution and possible improvements for future seabed preparatory works.
- OSTI ID:
- 400909
- Report Number(s):
- CONF-9606279--; ISBN 0-7918-1494-7
- Country of Publication:
- United States
- Language:
- English
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