Albian interval – 12 producers and five injectors – from a new tension
leg platform (TLP); and 17 subsea wells in Miocene reservoirs – 11
producers and six injectors – connected via four manifolds to the newbuild FPU Likouf. Production from the TLP will be sent to the Likouf
for processing; the vessel will be equipped with wash tanks to handle
the heavier Miocene as well as the light Albian crude, a technique
Total has pioneered for other mixed-crude applications at Pazflor in
block 17 offshore Angola and at Usan off Nigeria.
Hyundai Heavy Industries built the unmanned wellhead TLP,
which was installed at the Moho Nord location in 780 m ( 2,559 ft) of
water earlier this year. The Albian reservoir is much deeper, at 3,400
m ( 11,155 ft) below the mudline and is therefore more complex to
produce, with high temperatures and reservoir pressure issues. For
these reasons surface wellheads were considered a better solution for
the Albian drilling campaign.
There are no processing facilities onboard and no accommodation – a first for a TLP, according to Hyundai’s co-designer Doris Engineering – although personnel will come onboard for drilling and
coiled tubing operations. It is also the first TLP to feature a BOP and
coiled tubing. The drill floor is 17. 5 m ( 57 ft) above the upper deck,
higher than normal, to accommodate the coiled tubing equipment
below, with the BOP housed in a cage between the upper and lower
decks. An open wellbay with five center slots will allow the drilling
riser to be skidded from one slot to another during the sequential
drilling program without the need for dismantling.
Alongside, a new tender-assist semisubmersible rig, provided by
Bassdrill, will control the TLP’s modular drilling package. Overall operations on the platform will be monitored and controlled by staff on
the Likouf via a flexible umbilical connection. The FPU, which will
also supply much of the TLP’s power generation needs, will arrive
later this year at the offshore location. The 250-m (820-ft) long vessel
will be bigger than the Alima, with capacity to produce up to 100,000
b/d of oil and 2. 5 MMcm/d of gas. Oil will be exported through a
new subsea pipeline to Djeno and the gas to Nkossa for reinjection.
Technip’s construction vessels G1200 and Deep Pioneer have been
installing the network of rigid and flexible pipelines, umbilicals, and
subsea structures in phases since 2014.
Aside from Egypt, Nigeria has Africa’s widest-ranging capabilities for offshore engineering and construction. Local input into the
Egina project, 130 km (81 mi) offshore, is probably the highest for
any deepwater Nigerian project to date.
Total discovered the field in 1,750 m ( 5,741 ft) of water in the OML 130
block in 2003, and initially considered a tieback to the Akpo field FPSO.
However, strong results from further drilling in the area persuaded the
company to purse a standalone development, which Total and partners
CNOOC, Sapetro, and Petrobras finally sanctioned in mid-2013.
Samsung Heavy Industries in South Korea is building the 330-m
( 1,082-ft) long, 61-m (200-ft) wide and 33.5-m (110-m) deep FPSO,
which will be the largest in Total’s fleet, with a total weight of 34,000
metric tons ( 37,478 tons). This will have capacity to produce 200,000
b/d of crude at plateau, initially solely from Egina, later possibly
supplemented by production from the nearby Preowei field.
Six of the topsides modules are under construction at the SHI-
MCI yard at the deepwater LADOL complex in Lagos, namely:
• P1: Chemical injection package, foam and tote tanks area
• P4: Production manifold and pigging (Egina South and future hub)
• S1: Seawater booster pumps and MINOX water treatment package
• S2: Water injection, fine filtration and variable-speed drives/trans-
• P8: Oil export and oil metering/prover loop
• S8: Pancake for future development.
All will be installed on the FPSO following its anticipated arrival at
the yard during 3Q 2017. This will also be the first such installation
on a deepwater FPSO in Nigeria.
Saipem was awarded the EPCI contract for the subsea flowlines, risers and umbilicals, and the contractor is also responsible
for mooring of the FPSO and the oil loading terminal buoy at the
Egina location. The Saipem Rumoulumeni yard and Aveon Offshore
in Port Harcourt are handling much of the fabrication (Technip is
supplying the steel tube umbilicals). FMC Technologies has the
$1.2-billion EPCC contract for the subsea production systems.
The subsea spread will comprise 52 km ( 32 mi) of oil production
and water injection flowlines; 12 flexible jumpers; 20 km ( 12. 4 mi)
of gas export pipelines; a 2-km ( 1.2-m) oil export line; and 80 km
( 50 mi) of umbilicals. The sole offshore installation completed to
date has been the long baseline arrays required for the start of the
drilling campaign. Discussions continue with Saipem on the main
installation planning, depending on the available marine spread, but
work should get under way in 4Q or early next year.
In addition, Egina will export 360 MMcf/d of gas at peak through
a new 20-km ( 12.4-mi), 14-in. pipeline and associated subsea structures connected to the Akpo field FPSO. The new pipeline will tie
into the existing Akpo-Amenam subsea gas line via an in-line tee
assembly that has already been installed, with provision for a subsea
tie-in of Egina using a pipeline end manifold and connecting spool.
According to a Total spokesman for the project, the composition
of Egina’s reservoir fluids presents two main challenges. One is the
potential for souring during field life. The maximum hydrogen sul-
Left: The Egina FPSO hull afloat in the dock at Samsung’s Geoje Island facility in South Korea. Right: Tugs preparing for Egina hull tow-out.