ABSTRACT:

The Rosa field is located in the Total-operated prolific Bloc 17. The project consisted in tying the wells of the reservoir back to the Girassol FPSO in waterdepths down to 1500m. Due to the extended step-outs of up to 20 km and a total flowline length of 66 km stringent thermal design requirements were imposed on the system, both to provide sufficient fluid arrival temperatures at the FPSO and sufficient preservation time to allow circulation and replacement of the live oil with dead oil in case of a prolonged shutdown. Saipem chose in 2004 the ITP technology for flowline insulation and offshore fieldjointing which had previously been deployed both in deepwater projects (Shell operated Bonga field in Nigeria) and shallow water (Total Tchibeli project in Congo). The technical step-outs from the Bonga project were challenging in themselves, but the real difficulty lay in the project requirement for a fabrication in Angola

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