Cormorant oilfield

Cormorant oilfield
Location of Cormorant oilfield
Country	United Kingdom
Region	Shetland basin
Block(s)	211/26a
Offshore/onshore	Offshore
Coordinates	61°14′26″N 1°8′58″W / 61.24056°N 1.14944°W / 61.24056; -1.14944Coordinates: 61°14′26″N 1°8′58″W / 61.24056°N 1.14944°W / 61.24056; -1.14944
Operator(s)	TAQA Bratani
Field history
Discovery	September 1972
Start of production	1979
Peak year	1979
Production
Estimated oil in place	90 million barrels (~1.2×10^7 t)
Estimated gas in place	600 billion cubic feet (17×10^9 m3)

The Cormorant oilfield is located 161 kilometres (100 mi) north east of Lerwick, Shetland, Scotland, in block number 211/26a. It was discovered in September 1972 at a depth of 150 metres (490 ft). Estimated recovery is 90 million barrels (14×10^⁶ m³) of oil. The oil reservoir is located at a depth of 2,895 metres (9,498 ft).

Ownership

Originally, it was operated by Shell and licensed to Shell/Esso. On 7 July 2008, it was purchased by Abu Dhabi National Energy Company.^[1][2]

Production

Production started in December 1979 from the Cormorant Alpha platform. This platform is a concrete gravity platform of the Condeep type. It has four legs and storage capacity for 1 million barrels (160,000 m³) of oil. The total sub-structure weight is 294,655 tonnes and it is designed to carry a topsides weight of 32,350 tonnes.

The topsides facilities included capability to drill, produce, meter and pump oil. It also has capability to re-inject water to maintain reservoir pressure. Peak production was 24,000 barrels per day (3,800 m³/d) in 1979. The platform is also the starting point for the Brent System pipeline, a major communications centre and the location of Brent Log - air traffic control for Northern North Sea helicopter traffic.

In addition an Underwater Manifold Centre (controlled from the Cormorant platform also produces oil. This started up in mid 1983. It has a design capacity for 50,000 barrels per day (7,900 m³/d). The UMC lost communications several years ago but a project ongoing in 2006 is looking to produce from the UMC once again. Also a single satellite well (P1) is linked to the platform with a design capacity of 10,000 barrels per day (1,600 m³/d).

Natural gas is exported from Cormorant Alpha via the Vesterled gas pipeline which connect into the FLAGS pipeline at Brent Alpha to St Fergus Gas Terminal.

Cormorant A salvage 1977

A Norwegian organisation states that the Cormorant A platform almost sank in 1977 during its construction in Norway. This was disputed in a TV documentary on 7 May 2007.

See also

• Energy policy of the United Kingdom
• Energy use and conservation in the United Kingdom

References

1. ^ "Abu Dhabi national energy company pjsc (taqa) agrees to purchase north sea assets from shell u.k. ltd and esso exploration and production u.k. ltd". Al Bawaba. 2008-07-07. http://www.albawaba.com/en/countries/UAE/231277. Retrieved 2009-03-21. 
2. ^ Lin Noueihed (2008-07-07). "Abu Dhabi's Taqa buys Shell, Exxon North Sea interests". Reuters. http://uk.reuters.com/article/idUKL0772280320080707?sp=true. Retrieved 2010-02-09.