Douglas Complex

The Douglas Complex is a 54-metre (177 ft) high system of three linked platforms in the Irish Sea, 24 kilometres (15 mi)[1] off the North Wales coast. The Douglas oil field was discovered in 1990, and production commenced in 1996. Now operated by Eni, the complex consists of the wellhead platform, which drills into the seabed, a processing platform, which separates oil, gas and water, and thirdly an accommodation platform, which is composed of living quarters for the crew. This accommodation module was formerly the Morecambe Flame jack-up drilling rig.

Douglas Field
CountryUnited Kingdom
RegionEast Irish Sea Basin
Location/blockUK Block 110/13
Field history
Start of productionFebruary 1996
Estimated oil in place225 million barrels (~3.07×10^7 t)
Producing formationsTriassic Helsby Sandstone Formation

The Douglas Complex is also the control hub for other platforms in the area, and provides power for all platforms. It also offers recreational, catering and medical facilities for up to 80 personnel.[2] Oil from the Lennox, Hamilton, and Hamilton North unmanned satellite platforms is received and blended at the complex.[3]

Fluids from the Lennox installation via the gas pipeline are treated on the Douglas installation in the 3-phase (oil, gas and produced water) Lennox Production Separator.[4] Following separation, gas flows to the Offgas Compressor suction manifold. Oil is directed to the Oil Stripper where the liquid is stripped of sour gas using a counter-current flow of stripping gas. Produced water from the separator is directed to the Produced Water Hydrocyclones where hydrocarbon liquids are removed prior to overboard disposal. Well fluids from the Douglas Wellhead tower are treated in the 3-phase Douglas Production Separator. Gas flows to the Offgas Compressor suction manifold and hydrocarbon liquids are directed to the Oil Stripper, and water to hydrocyclones as described above. Oil from the Oil Stripper is pumped by the Oil Transfer Pumps via Fiscal metering to the Main Oil Transfer Pumps to tanker loading. Gas from the Oil Stripper is compressed and sent to the Offgas Compressor.[4]

Gas is sent through a pipeline 33.5-kilometre (20.8 mi) long to a processing plant at Point of Ayr, in Flintshire, North Wales. After processing, almost the entire output is sold to E.ON to fire the combined cycle gas turbine power station at Connah's Quay, on Deeside, in Flintshire. Oil produced in Liverpool Bay is sent through another pipeline, 17 km long, to the Offshore Storage Installation, a permanently anchored barge which acts as a floating oil terminal, capable of holding 870 thousand barrels (~1.2×10^5 t) of oil. From the floating terminal oil is transferred to tankers approximately once every month.[2]

See also


  1. "Offshore Liverpool Bay Development". Offshore Technology. Retrieved 2007-12-03.
  2. "Offshore Industry". Virtual Prestatyn. Archived from the original on October 24, 2007. Retrieved 2007-12-03.
  3. "Hazardous area instrumentation is all at sea". Engineering Talk. 2006-05-09. Archived from the original on 2011-05-22. Retrieved 2007-12-12.
  4. PFD Separation and Stripping, undated


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