Hutton oilfield

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Hutton oilfield
Hutton oilfield is located in North Sea
Hutton oilfield
Location of Hutton oilfield
Country Scotland, United Kingdom
Region North Sea
Location East Shetland Basin
Offshore/onshore Offshore
Coordinates 60°17′42″N 1°55′34″E / 60.295°N 1.926°E / 60.295; 1.926Coordinates: 60°17′42″N 1°55′34″E / 60.295°N 1.926°E / 60.295; 1.926
Operator ConocoPhilips
Field history
Discovery 1973

The Hutton oil field, located on the UK continental shelf, was the location for the first ever production Tension Leg Platform (TLP).

History[edit]

The Hutton oil field is situated in the East Shetland Basin in the UK North Sea on the western side of the Viking Graben. It straddles UK Blocks 211/27 and 211/28. The field was discovered in July 1973 by the Conoco well 211/28-la and was operated by Conoco (UK) Limited.

Geology[edit]

The structure comprises a series of southwesterly dipping tilted fault blocks. The reservoir sandstones are Middle Jurassic in age and were deposited as a result of deltaic progradation across the Hutton area. The oil bearing Brent Group sandstones vary in thickness from 150 ft to 380 ft with average porosities of 22% and permeabilities of 500-2000 md in the producing zones. Original recoverable reserves were estimated at 190 million barrels, of which the field has produced 107 million barrels by 1991.[1]

Facility[edit]

Vickers Offshore (Projects & Developments), had been working on the TLP Concept since 1974. The Hutton topsides design was awarded in 1981 to Brown & Root. The integrated topsides was built at the McDermott Ardersier yard in Scotland, and the hull at the HiFab Nigg yard. Hutton TLP was installed in 1984 by Aker Offshore.[2] It was the first Tension Leg Platform permanently moored to the sea floor via tethers or tendons at each of the structures corners.[3]

The Hutton TLP was originally designed for a service life of 25 years in Nord Sea depth of 100 to 1000 metres. It had 16 tension legs. Its weigh varied between 46,500 and 55,000 tons when moored to the seabed, but up to 61,580 tons when floating freely.[4] The total area of its living quarters was about 3,500 square metres and accommodated over a 100 cabins though only 40 people were necessary to maintain the structure in place.[4]

At the time of decommissioning the field was operated by Kerr-McGee. The TLP platform was removed for re-use outside the UK when the platform was purchased by Sevmorneftegaz, a subsidiary of Gazprom, in August 2002, and after having its decommissioning programme accepted by the UK Government.[5]

The floating platform was towed to Murmansk in Russia where the topsides facilities and main hull were de-mated. Subsequently the topsides were transported by barge to the Sevmash fabrication yard at Severodvinsk, where they were temporarily stored while undergoing refurbishment and refitting.

After completion the topsides were reinstalled onto a new hull structure of the Prirazlomnaya platform, and will be towed into position ready for a new role in the development of the Prirazlomnoye Field, 1,200 kilometres (750 mi) north east of Arkhangelsk in the Pechora Sea.[3][5] In early 2009 the hull of the former Hutton TLP was being towed from Murmansk to the Gulf of Mexico for reinstalling on a new structure,[5] however the project was cancelled, and hull is currently cold-stacked in the Cromarty Firth, Scotland.[6]

References[edit]

  1. ^ Geological Society, London (Lylle Memoirs)
  2. ^ Offshore Pioneers - Brown and Root, Gulf Publishing, 1997 ISBN 0-88415-138-7
  3. ^ a b "Case Studies". The United Kingdom Offshore Oil and Gas Industry Association. Retrieved 2009-10-11. 
  4. ^ a b http://everything.but.architecture.pagesperso-orange.fr/Oilrig/oilrig.htm
  5. ^ a b c "Platform hull from Murmansk to Mexico". Barents Observer. 2008-11-27. Retrieved 2009-10-11. 
  6. ^ http://www.offshore-mag.com/index/article-display.articles.offshore.regional-reports.north-sea-northwest-europe.2009.09.rig-stacks_underline.QP129867.dcmp=rss.page=1.html

Reconversion d’une plate-forme offshore, la TLP Hutton by Pierre Fuentes, École Nationale Supérieure d'Architecture de Lille, 2003.