Petrobras has let a contract to Allseas to deliver a rigid riser-based subsea solution for the ultra-deepwater Atapu-2 pre-salt field development, 230 km offshore Rio de Janeiro.
The contract covers design, procurement, construction, and installation of 143 km of rigid risers and flowlines in water depths exceeding 2,000 m. The subsea network will connect 18 wells to a new FPSO via steel catenary risers in a ‘lazy wave’ configuration.
The scope also includes critical components such as flex-joints, pipeline end terminations, and jumpers to complete the connections. Offshore work is scheduled to begin first-quarter 2029 and will be executed by Allseas’ pipelay vessel Audacia.
The award follows the Búzios-10 contract announced earlier this year, which covers 111 km of rigid risers and flowlines linking 16 wells to an FPSO. While similar in size and complexity, Atapu-2 is larger in scope, with additional wells and longer pipeline systems.
Atapu field, which lies within Block BM-S-11A, has been producing since 2020 through the 150,000-b/d P-70 floating production, storage, and offloading (FPSO) vessel. The second development phase, Atapu-2, will comprise a new-built 225,000-b/d FPSO.
Petrobras is operator of the field with 65.7% interest. Partners are TotalEnergies 15%, Shell PLC (16.7%), Petrogal (1.7%), and PPSA (0.9%).
