Subsea 7’s newest pipelay vessel Seven Vega will support a contract awarded by Chevron USA Inc for the subsea installation services at the St Malo field, located in deep water in the Walker Ridge area of the US Gulf of Mexico
Subsea 7’s scope of work includes project management, engineering, procurement, construction and installing the multiphase pump system at the St Malo field, located 402 km south of New Orleans in some 2,100 m of water in the US Gulf. Subsea 7’s scope will also cover a 23-km water injection flowline system, inclusive of a Swagelining polymer lined flowline, and the water injection control system.
Project management and engineering will commence immediately at Subsea 7’s offices in Houston, Texas. Fabrication of the water injection flowline and riser will take place at Subsea 7’s spoolbase in Ingleside, Texas, with offshore operations occurring in 2021.
Subsea 7 US vice president Craig Broussard, said, “The St Malo multiphase pump system and water injection projects award is an important win for the Gulf of Mexico region. It combines the utilisation of our newest pipelay vessel, Seven Vega, along with Subsea 7’s proven project execution capabilities and Swagelining’s polymer lining technology.”
Continued Mr Broussard, “In addition, the combination of the SURF scope for Subsea 7 and ongoing subsea equipment delivery by OneSubsea, will allow the Subsea Integration Alliance to work in collaboration with Chevron to unlock the value of an integrated approach to project optimisation.”
Expected to join Subsea 7’s fleet in H1 2020, Seven Vega has an overall length of 149.2 m, breadth of 33 m, depth of 13 m and draught of 8.3 m, accommodation for 120 (in four suites, 42 single cabins and 37 double cabins) and dynamic positioning class 3 capability.
The vessel’s pipelay system will be capable of installing complex rigid flowlines including pipe-in-pipe systems and electrically heat traced flowlines in water up to 3,000 m.