Energy giant BP has chosen Allseas to complete the subsea pipelay scope for its ultra-deepwater Greater Tortue Ahmeyim (GTA) natural gas project offshore Mauritania and Senegal.
Allseas will start GTA offshore pipelay works in early December 2023 using the world’s largest construction vessel Pioneering Spirit. Installation support will be provided by Allseas’ offshore construction support vessel Oceanic.
The contract covers the installation of approximately 75 kilometres outstanding on the two 16-inch export pipelines with field termination assemblies (FTAs) in water depths between 1,500 and 2,800 metres, and four 10-inch CRA infield lines with FTAs up to two kilometres long in 2,800 metres of water. No financial details of the deal were disclosed.
To install the 10 FTAs, the Pioneering Spirit will be fitted with a special 1,000-tonne J-mode installation frame, designed in-house and built at Allseas’ Heijningen fabrication yard in the Netherlands.
Located on the maritime border between Mauritania and Senegal, GTA is being developed as a gas field with a 30-year production potential. It is among the lowest-cost greenfield projects in the world.
The initial phase of the project is expected to deliver approximately 2.5 mtpa of natural gas. GTA is estimated to contain more than 15 tcf of potentially recoverable gas resources.
