SABLE OFFSHORE
ENERGY PROJECT, SABLE ISLAND, CANADA
The Sable
Offshore Energy Project lies near Sable Island, 10km to 40km north
of the edge of the Scotian Shelf, offshore Nova Scotia, in water
depths ranging between 20 and 80m. The Sable Offshore Energy Project
consists of the six gas fields Venture, South Venture, Thebaud,
North Triumph, Glenelg and Alma. These contain about 85 billion
m³ of recoverable gas reserves. The Sable Project is projected
to last until the year 2025.
An estimated
28 production wells are anticipated for the project. The first
12 wells, planned to be drilled at the Thebaud, Venture and North
Triumph fields, were completed by the end of 1999. The drilling
programme was shared between Rowan and Santa Fe (Canada). The
Rowan Gorilla II and the Santa Fe Galaxy II will be used. Previous
drilling in the area has indicated the presence of high-temperature,
high-pressure wells.
The fields
are being developed in two stages.
The first
phase of the Sable Island project saw the development of the Thebaud,
Venture and North Triumph fields in November 1999.
THEBAUD
Thebaud is
used as the gas-gathering hub. North Triumph and Venture have
been developed as satellite platforms, feeding into Thebaud.
The central
Thebaud complex consists of two bridge-linked platforms. The larger
platform has accommodation for approximately 40 offshore production
workers and support personnel. The second and smaller of the two
platforms supports the wellhead and processing equipment and collects
and dehydrates gas from all of the fields in production.
NORTH TRIUMPH
AND VENTURE
These will
be developed by unmanned satellite platforms although they will
be occupied as field operations require. The platforms will incorporate
dry wellhead structures and minimal processing facilities to separate
produced water from the gas and natural gas liquids.
CONTRACTS
- TOPSIDES
The Thebaud
topsides facilities were fabricated by Kvaerner Oil and Gas at
its Teesside facilities in a $65 million contract. The North Triumph
topsides fabrication contract was won by a joint venture between
MM Industra and Brown & Root. The contract's estimated value
is about $13 million with about 90% of the 100% Canadian content
coming from Nova Scotia.
The Dartmouth-based
Fabco/CKT joint venture won the $16.7 million fabrication subcontract
for the Thebaud and Venture accommodation modules.
CONTRACTS
- JACKETS
The $13 million
contract for the construction of the Thebaud and Venture jackets
was awarded in April 1997 to the joint venture between MM Industra
and Brown & Root. The scope of work included the procurement,
construction, construction engineering, fabrication, loadout and
seafastening of the two jackets and piles.
The two remaining
(Thebaud accommodation platform and North Triumph) jackets were
fabricated by Texas-based Peter Kiewit Inc in its Corpus Christi
yard.
SABLE ISLAND
INSTALLATIONS
The steel
wellhead jackets were installed on Thebaud and Venture at the
start of the project and then a jack-up was used to pre-drill
the wells over them. The jackets were installed in April 1998
by the crane vessel M7000.
PIPELINES
Infield lines
ranging from 5 to 55km, with an outside diameter of up to 457mm,
are used to link the platforms with the Thebaud gas gathering
hub. In all there will be around 175km of interfield pipelines
to be installed.
The gas and
natural gas liquids from Sable Island are then transported through
a two-phase subsea pipeline from Thebaud to the onshore facilities
in the Country Harbour area. The pipeline will be 225km long,
with an outside diameter of 609mm. The pipeline corridor was chosen
to avoid significant fishing areas and other sensitive sites.
The $250 million
pipelaying was carried out by Allseas in August 1999, using its
giant pipelaying ship Solitaire.
Halifax-based
Shaw and Shaw was awarded a contract for the anti-corrosion and
concrete weight coating of subsea interfield flowlines across
the Sable Island field and the main gathering line.
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