Project Profile
Value: US$400 million
Location: 20km west of Tullow’s Jubilee field, Deepwater Tano licence, offshore Ghana
Area: 800 sq km
Reserves: 300 million bbl
Production: 60,000 bpd (October ,2017), 100,000 bpd (by 2018)
FPSO capacity: 80,000 bpd
Depth: 1,000 - 2,000m
Start-up Year: August 2016
The Tweneboa-Enyenra-Ntomme (TEN) fields are located in the Deepwater Tano licence which covers an area of more than 800 sq km, and lies around 20km west of Tullow’s Jubilee field. The TEN development project includes the collective development of three hydrocarbon accumulations - Tweneboa, Enyenra (formerly, Owo) and Ntomme. The three oil and gas fields are part of the Deepwater Tano license located offshore of Ghana. The fields lie in water depths of 1,000m to 2,000m. The development is located 25km away from the Tullow-operated Jubilee field. It is the first deepwater field to be developed in offshore Ghana. A field development plan for the project is expected to be submitted in the second half of 2012. First production was made in mid-2016. A peak production rate of 100,000 barrels of oil per day is expected by 2018. The project is expected to recover approximately 300 million barrels of oil.
Discovery of Tweneboa and Enyenra fields
The Tweneboa field was discovered in March 2009 by the Tweneboa-1 well. The well struck 21m of net pay and four metres of oil-bearing sand. Enyenra was discovered by the Owo-1 well in June 2010. The well struck 53m of light oil pay in two zones. Pressure data from the well indicated that the field belonged to the same accumulation as the Tweneboa field. A sidetrack to the Owo-1 well was drilled in September 2010 by the Sedco 702 semisubmersible. The sidetrack encountered 16m of net oil pay.
Field development using an FPSO facility
Tullow is planning to jointly develop the three fields using a single floating, production, storage and offloading (FPSO) facility. A total of 33 wells are planned to be drilled, including 15 oil production, 15 water injection, one gas production and two gas injection wells. Another 16 wells are expected to be drilled in the future, depending upon the production levels. Hydrocarbon fluids from the wells will be collected at a subsea manifold tied back to the FPSO. The fluids will be processed onboard the FPSO to separate crude oil and gas. Crude oil will be offloaded onto tankers for export to markets. Gas will be injected into the reservoirs or used for powering the FPSO. The gas may also be exported to the Jubilee field for future transport to shore. The front end engineering design (FEED) for the FPSO is being selected through a design competition. Three FPSO contractors including Modec are participating in the competition. The FPSO will be designed for a processing capacity of 80,000 bopd. It will be spread-moored and will include an oil offloading buoy.
Production at TEN field will gradually increase to 80,000 bopd by the end of 2016. (August, 2016)
Operators:
Tullow Oil: Operator with 49.95% interest
Kosmos Energy: 18% interest
Anadarko Petroleum: 18% interest
Ghana National Petroleum Company (GNPC): 10% interest
Sabre Oil and Gas Limited: 4.05% interest
Contractors:
2H Offshore: Lead riser engineering consultancy for the delivery of the flexible riser system
Aker Solutions: Well intervention services
Consortium for providing a floating production, storage, and offloading system:
Mitsui
Marubeni
MOL
Consortium for EPC contract: Engineering, procurement, fabrication and other work at Tullow\'s TEN Project including the installation of more than 22 miles of pipe-in-pipe flowlines, related flowline termination structures and foundation piles structures
- Technip
- Subsea 7 (transportation and installation of manifolds, riser bases and flying leads)
MODEC: Engineering, procurement, construction, mobilisation and operation of the FPSO, including topsides processing equipment as well as hull and marine systems
Transocean: Drilling contractor
Vallourec: Vallourec will provide Subsea 7 with seamless offshore line-pipe including anticorrosion coating for a total of 15,000 tonnes, which will be dedicated to production flowlines (pipe-in-pipe system by ITP InTerPipe) and gas export line
Serimax: Contract to accomplish associated welding services for the double jointing operations related to the production pipe in pipe and the gas export lines
Wood Group Kenny (WGK): Engineering services contract to support Tullow Ghana Limited and its partners through the execution phase of the project, providing subsea, umbilical, risers, flowlines (SURF) engineering services as well as specialist technical support and technical assurance services across the SURF implementation work scope through to first oil.
DeepOcean: Contract from Tullow Oil to provide a multi-purpose subsea construction vessel on Jubilee and TEN fields, offshore Ghana. The deal includes subsea tree and jumper installations in about 1,100m to 2,000m water depth. DeepOcean Ghana is mobilising the Rem Forza subsea construction vessel for a six-month charter from March to August 2015. It may be extended to 2016.
Expro: Contracts from Tullow Oil worth in excess of US$100 million over three years. Following on from Expro’s phase one contract for Jubilee, involving more than 10 completions, the company has been awarded continued services for phase 1a. This covers completions on new wells for Jubilee, as well as interventions and remedial work. A number of Expro’s product lines and services will be utilised, including large bore subsea completion landing strings, subsea exploration and appraisal landing strings, high flow rate surface well testing and sampling services. The TEN project will also see Expro provide subsea completion work in all planned wells.
FMC Technologies: Contract to supply subsea systems for its Tweneboa-Enyenra-Ntomme (TEN) Cluster project located in the Deepwater Tano block, 60km off the coast of Ghana. The scope of the contract includes subsea trees, manifolds, tooling, associated subsea control systems and systems integration.
Eidesvik Offshore ASA: Charter agreement for the Offshore Construction Vessel MV Viking Neptun for work on the ‘TEN URF Development Project’ offshore Ghana. The firm contract period is 50 days plus mobilization period with an option for charterers to further extend the scope of work with 50 days. The work is expected to begin in Q4-2015.
Reach Subsea: Contract to perform the ROV services under this agreement, as part of the 3-year contract with Eidesvik Offshore, signed in October 2014.
Sub-contractors:
Sembcorp Marine (through its subsidiaries Sembmarine SLP and Jurong Shipyard Pte Ltd): Offshore energy related contracts valued at a combined US$174.3 million, contracted by regular customer MODEC Offshore Production Systems (Singapore) Pte Ltd, to complete the repair and life extension, and conversion of a VLCC into a Floating Production Storage and Offloading (FPSO) vessel as part of the TEN Development Project.
Aibel Thailand: Procurement and construction contract from MODEC for the fabrication of 7 topsides modules for a new-build FPSO slated for use at Tullow’s TEN Cluster development offshore Ghana.
Harkand and Consolidated Shipping Agencies: Contracted by Technip in a joint venture to support offshore and onshore construction activity in Ghana. Aberdeen-based Harkand Andrews Survey will service Tullow Oil’s Tweneboa, Enyenra, and Ntomme (TEN) project in the deepwater Tano block, 60 km (37 miles) offshore Ghana. Work is due to start in October 2015. The survey team will manage and support all survey needs on board Technip’s vessels during offshore construction activities, which include rigid and flexible pipelay, structure installations, spool metrology, pre-lay, and as-built surveys.