Amec is already on Armada, but the re-newed contract is effectively three times the size of the previous one.
Projects under the new contract include the implementation of subsea tie backs from the Gaupe and North West Seymour wells to the Armada platform hub and a new subsea tie back to the North Everest platform hub.
It also includes a feasibility study for the continued development of the Armada platform as a processing hub.
To increase offshore capacity, work has begun in January to install additional living quarters on the North Everest platform.
John Pearson, managing director of Amec's Europe and West Africa business, said: "I am proud of our proven performance, safety record and drive for continuous improvement, all of which have helped us secure this award. We look forward to another three years of excellent delivery for BG Group and for the North Sea."
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