The floating production, storage and offloading (FPSO) vessel, Prof. John Evans Atta Mills set sail from Singapore on 23 January.
The vessel is sailing to Ghana, where it will produce and store oil from Ghana’s Tweneboa-Enyenra-Ntomme (TEN) offshore oil fields. The vessel was built at the Tuas shipyard in Singapore.
TEN will sit just 30km (18.75mi) from Tullow Oil’s Jubilee, another project produced via FPSO, which came onstream in 2010, and became Ghana’s first deepwater development.
Japan’s MODEC won a contract to supply a leased FPSO for the TEN development in August 2013. The contract with MODEC covers engineering, procurement construction, mobilization and operations of the unit, and topsides processing equipment, hull and marine systems. Subsidiary Sofec designed and supply the unit’s external turret mooring system.
The vessel is a conversion of the very large crude carrier (VLCC) Centennial J. It is equipped to provide plateau production of 80,000 b/d of oil, 70 MMcf/d of gas processing, and storage for 1.7 MMbbl of fluids.
Sembcorp Marine’s Jurong Shipyard confirmed a contract from MODEC Offshore in Singapore last October (2014) to carry out a conversion and life extension to the VLCC for the TEN project – the 22nd conversion by Jurong on behalf of MODEC. In addition to the crude processing, Sembcorp says the TEN FPSO will also have handling for 65,000 b/d of produced water and will provide 132,000 b/d of filtered and de-aerated sea water.
In October 2013, Tullow awarded contracts for subsea construction and installation for TEN to a Technip-Subsea 7 consortium worth US$1.23 billion. Technip took $723 million of the value, for provision of nine flexible risers, three flexible flowlines, and 12 flexible pipeline spools, with a total length of 48km (30mi), as well as installation of 63km (39mi) of static and dynamic umbilicals, plus installation of 10 rigid well jumpers and delivery of a further six prefabricated jumpers.
Subsea 7’s scope of work, worth $500 million, is for supply of flowline terminations, structural foundation piles, as well as installation of subsea manifolds, riser bases and flying leads. Much of Subsea 7’s equipment will be fabricated in Ghana, where a “substantial” level of fabrication will take place. Offshore installation for the project is due to commence this year using the deepwater pipelay and heavy lift vessel Seven Borealis, which is equipped for both rigid S-lay and J-lay installation, and which previously debuted on Total’s CLOV project offshore Angola.
FMC Technologies will supply a subsea system under a $340 million contract covering subsea trees, manifolds, tooling, subsea controls and systems integration.
Phase one of the TEN development with a capex of US$4.09 billion involves 17 wells, for Enyenra, Ntomme, water injection, and Tweneboa and non-associated gas in first phase. A second phase involves infill wells on Enyenra and Ntomme, costing a further $900 million, with first oil from this phase due mid-2018.
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