BP PLC has let contracts to McDermott International Inc. and Baker Hughes for subsea umbilicals, risers, and flowlines (SURF) and subsea production system equipment at the Greater Tortue Ahmeyim natural gas project offshore Mauritania and Senegal.
Awarded an engineering, procurement, construction and installation SURF contract, McDermott plans to use its upgraded Amazon vessel, DLV 2000, North Ocean 102 (NO 102) and third-party vessels to support installation scheduled to begin in late 2020. Amazon modifications—expected to be complete prior to the installation campaign begins—include a multijoint (hex) J-Lay system for ultradeepwater projects and the addition of a multijoint facility, dual pipe loading cranes, and additional power generation. McDermott-designed pipeline and riser structures will be fabricated in Batam, Indonesia.
McDermott puts the value of the contract at $500-750 million.
Baker Hughes will provide five large-bore deepwater horizonal christmas trees, a 6-slot dual bore manifold, a pipeline end manifold, subsea distribution units, three subsea isolation valves, diverless connections and subsea production control systems.
These latest awards follow an initial front-end engineering and design phase, awarded in March 2018, during which Baker Hughes and McDermott together defined the technology and equipment scope for a four-well development phase.
The initial subsea infrastructure connects the first four of 12 wells consolidated through production pipelines leading to a floating production, storage, and offloading vessel (OGJ Online, Mar. 1, 2019). Liquids are removed, and the export gas is transported via pipeline to the LNG hub terminal. The project will provide LNG for export and make gas available for use in Mauritania and Senegal.
Tortue Ahmeyim field development is on the C-8 block offshore Mauritania and the Saint-Louis Profond block offshore Senegal. BP operates Tortue with 61%. Partners are Kosmos 29%, Senegal-state Petrosen 5%, and Mauritania state firm SMHPM 5%.
