Andrew oilfield

Andrew oilfield
Andrew oilfield
Andrew oilfield is located in North Sea
{{{alt}}}
Location of Andrew oilfield
Country United Kingdom
Location North Sea
Offshore/onshore offshore
Coordinates 58°05′N 1°15′E / 58.083°N 1.25°E / 58.083; 1.25Coordinates: 58°05′N 1°15′E / 58.083°N 1.25°E / 58.083; 1.25
Operator(s) BP
Field history
Discovery 1974
Start of development 1994
Start of production 1996
Production
Estimated oil in place 150 million barrels (~2.0×10^7 t)
Estimated gas in place 0.245 billion cubic feet (6.9×10^6 m3)
Producing formations Cretaceous and Palaeocene rocks

The Andrew oilfield is a relatively small hydrocarbon field in the UK sector of the North Sea, 230 kilometres (140 mi) North-East of Aberdeen and it is operated by BP. It is produced from a single platform, which is also the hub of the Cyrus and Farragon subsea developments.

Contents

Discovery and development

BP originally discovered oil in the Palaeocene rock in block 16/28 of the UKCS in 1974, with further appraisal work conducted by ConocoPhilips the following year. A gas reservoir was also discovered in the Cretaceous rock below the Palaeocene.

At the time, the small size of the field made it uneconomical to develop. It was not until twenty years later when BP put together an alliance of seven contractors to share in the risk of development, including Brown & Root, Santa Fe, Saipem, Highlands Fabricators, Allseas, Emtunga and Trafalgar House.

In 1994, the project was sanctioned and first oil was produced from predrilled wells in 1996.

Reserves

The Andrew is estimated to have 150 million barrels (24×10^6 m3) of liquid hydrocarbons, mostly oil, with some natural gas condensate. The Andrew oil is light with an API gravity of 40°. There is also a gas cap in the Palaeocene reservoir in addition to the lower cretaceous reservoir and the associated gas from the oil. There is estimated to be 245 million cubic feet (6.9×10^6 m3) of recoverable gas, though the lower cretaceous reservoir is not fully appraised.

Hardware

The Andrew field is produced using a fixed platform, with topsides facilities supported on a four leg steel jacket. The platform is relatively small accommodating only 80 people. It contains a full process plant for separating water and gas from the production fluids. Platform power is provided from three 6MW gas turbines, fed principally from produced gas.

There are presently 17 operational wells, 15 producing oil from the Palaeocene, one reinjecting gas into the gas cap and another producing gas from the Cretaceous reservoir (known among the asset simply as "The Lower Cretaceous"). The Andrew well bay has plenty of room for further wells as it has a total of 24 slots, only 18 of which are occupied (17 with wells and one slot with umbilical lines to Farragon). The Andrew also receives flowlines from the Cyrus subsea wells.

The Xmas trees and wellheads are supplied by Vetco. The four original pre-drilled wells (though one has since been side-tracked) on the South side of the well bay use slightly smaller wellheads than the rest because they were part of the original template before the platform was put in place.

The Xmas trees have the unusual property of having two Swab valves, rather than just one. The intention behind this was to allow the rigging up and down of pressure control equipment for well work without having to shut in the well. This would save money in lost revenue for the day the well would normally not be flowing. However, the experience over the past ten years has shown that the increased cost of maintaining an extra valve does not match the savings.

Processed oil is exported to the Forties pipeline system then on to Cruden Bay. Natural gas is exported to the Central Area Transmission System to Teeside. Produced water is cleaned in the process plant to sufficient quality that it is dumped overboard.

Andrew is named for the patron saint of Scotland, which is a very popular name in general among the Scots due to their more fierce sense of Scottish patriotism. For this reason, the logo of the Andrew platform is more "Scottish" than many others. It consists of a Saltire shaped as a drop of liquid and is more prominently displayed than the logos of other platforms.

Cyrus and Farragon

Cyrus and Farragon are two smaller satellite oil fields in the 16/28 Andrew block. Cyrus was originally produced in 1990 by OPV Seillean. It was then redeveloped along with the main Andrew project for restart as a subsea tieback in 1996. It produces through three horizontal wells (though one is presently shut in) and the unprocessed production fluids are piped through a riser to the platform where it is produced through its own process (for metering purposes). The separated products are then exported along with the rest of the Andrew export.

Farragon is a recent development. This small Palaeocene field is still being developed by a dedicated team at BP's North Sea headquarters in Dyce, though it has been producing through two wells since 2006. The produced fluids are transported directly to the export line without processing, though umbilical lines tie back to the platform.

See also

External links


Wikimedia Foundation. 2010.

См. также в других словарях:

  • Andrew (disambiguation) — As a first name, Andrew (from a Greek word meaning manly or courageous ) may refer to:Saints *Saint Andrew the apostle *Saint Andrew of Lampsacus *Saint Andrew Corsini *Saint Andrew of Crete *Saint Andrew the ScotRoyals and nobles *Andrew I of… …   Wikipedia

  • Andrew Gould — (December 17, 1946) is chief executive officer of Schlumberger Limited, a global oilfield services company supplying technology, information solutions and integrated project management. Before assuming his current role in February 2003, Gould was …   Wikipedia

  • Schlumberger Oilfield Services — Schlumberger Oilfield Services, a division of Schlumberger Limited, is the world’s largest supplier of exploration and production (E P) services, solutions and technology to the international petroleum industry. Management* Chakib Sbiti Executive …   Wikipedia

  • Carnegie, Andrew — born Nov. 25, 1835, Dunfermline, Fife, Scot. died Aug. 11, 1919, Lenox, Mass., U.S. U.S. industrialist and philanthropist. The son of a Scottish weaver, he emigrated to the U.S. with his family in 1848. A job in a telegraph office led to his… …   Universalium

  • List of oil and gas fields of the North Sea — This list of oil and gas fields of the North Sea contains links to oil and natural gas reservoirs beneath the North Sea. In terms of the oil industry, North Sea oil often refers to a larger geographical set, including areas such as the Norwegian… …   Wikipedia

  • Oil fields operated by BP — This is a list of oil and gas fields operated by BP. Contents 1 United Kingdom 1.1 Onshore 1.2 Southern North Sea 1.3 Central North Sea …   Wikipedia

  • Schlumberger — Infobox Company company name = Schlumberger Limited company company type = Public (nyse|SLB) company slogan = Excellence in Execution foundation = 1927 location = Operates in 80+ countries. Incorporated in the Netherlands Antilles with principal… …   Wikipedia

  • Mantle (geology) — For other uses, see Mantle (disambiguation). Earth cutaway from core to exosphere. The mantle is a part of a terrestrial planet or other rocky body large enough to have differentiation by density. The interior of the Earth, similar to the other… …   Wikipedia

  • Houston, Texas — Infobox Settlement official name = City of Houston settlement type = City nickname = Space City imagesize = image caption = image #ifeq:Houston, Texas|Houston, Texas|Seal of Houston, Texas.png| mapsize = 250px map caption = Location in the state… …   Wikipedia

  • List of National Historic Sites of Canada — This is a complete list of the National Historic Sites of Canada. All such designations are made by the federal Minister of the Environment on the advice of the Historic Sites and Monuments Board of Canada . As of March 2008, there are 935 sites …   Wikipedia


Поделиться ссылкой на выделенное

Прямая ссылка:
Нажмите правой клавишей мыши и выберите «Копировать ссылку»