West African Ventures Ltd., Sea Trucks’ principle Nigerian business, secured the contract last June.
Sonam is in shelf concession OML 91, Escravos Area, in water depths ranging from 7 m (23 ft) around Okan to 66 m (216 ft) at Sonam.
The work scope comprised:
- Transportation and installation of the Okan PRP jacket, piles, deck, and bridge
- Survey of the pipeline route and installation of a 32-km (19.9-mi), 20-in. pipeline between Sonam NWP and Okan PRP
- Fabrication, load-out, and installation of risers and subsea spools for both facilities
- Pre-commissioning and commissioning of the pipeline, including hydro-test, dewatering, drying and nitrogen purging.
Field installation started last November with the pre-lay survey.
Sea Trucks employed two of its DP-3 pipelay construction vesselsJascon 30 for the pipelay operations, and Jascon 25 for installation of the jacket, deck and bridge, with the construction barge Jascon 8 performing installation of subsea equipment and pre-commissioning activities.
Various other Sea Trucks tugs and barges supported the offshore campaign, which finished last month.
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