Buzzard oil field

The Buzzard Oil Field is an oil field located in the North Sea. It was discovered in 2001 by PanCanadian, and developed initially by PanCanadian's successor EnCana and then by Nexen. The oil field was initially operated and owned by Nexen which is now a subsidiary of China's CNOOC. The total proven reserves of the Buzzard oil field are 1.5 billion barrels (240×10^6 m3), and production will be centered on 180,300 barrels per day (28,670 m3/d).[1]

Buzzard Oil Field
An oil platform departing Hartlepool for the Buzzard field in 2010
CountryUnited Kingdom
RegionNorth Sea
Offshore/onshoreoffshore
OperatorCNOOC - 43%,
PartnersSuncor Energy - 30%, BG Group - 22%, Edinburgh Oil & Gas - 5%
Field history
Discovery2001
Start of production2007
Production
Current production of oil180,000 barrels per day (~9.0×10^6 t/a)
Estimated oil in place1,500 million barrels (~2.0×10^8 t)

The Buzzard oil field is in Blocks 19/10, 19/5a, 20/6 and 20/1s.[2]

The Buzzard reservoir has a low gas/oil ratio and requires pressure maintenance through water injection. Buzzard’s oil consists of medium sour crude: 32.6° API, 1.4% sulphur.[3]

Operations

The Buzzard field development comprises four bridge-linked steel platforms: the wellhead facilities (W) for up to 27 production wells, production facilities (P), a platform supporting accommodation and utilities (UQ) and an oil stripper platform (PS).[3]

The oil processing facilities comprise a 3-phase (oil/vapour/water) Production Separator. Oil from the separator flows to the 3-phase Second Stage Separartor. Oil from the latter is 'spiked' with Natural Gas Liquids (NGL) from the gas dewpointing plant, then injected with a hydrogen sulphide (H2S) scavenger chemical prior to metering and export.[4]

Produced water from the Second Stage Separator is recycled to the Production Separator, and from there to the produced water treatment facilities using hydrocyclones before overboard disposal.[4]

Vapour from the two Separators is compressed in an Offgas Compressor and a LP/HP compressor. Compressed gas passes through a Mercury Removal Bed and an Acid Gas Removal system, which uses a counter-current flow of amine solvent, and then through a Mercaptans Removal Bed. The gas is dehydrated in a gas dehydration system which uses a counter-current flow of glycol. After dehydration the gas is cooled and passes through a Joule-Thomson valve to reduce its pressure and hence its temperature to remove liquids and achieve a gas hydrocarbon dewpoint. Natural Gas Liquids are separated and co-mingled with the export oil stream. Gas is compressed in the HP Compressors, some is used as gas lift on the production wells, some as fuel gas, and the remainder is exported.[4]   

Oil is exported from Buzzard via an 18 inch pipeline from the Buzzard processing platform to the nearest point in the Forties to Cruden Bay System, approximately 28 km away. Oil flows to Cruden Bay and then onto the Kinneil Terminal. First oil was produced in December 2006.[3]

Gas is exported via a 10 inch pipeline from Buzzard to the Captain ‘T’ point on the UK Frigg pipeline 29 km away. From there the gas is transported to the St Fergus Gas Terminal. Fuel gas can also be imported onto Buzzard from the Frigg pipeline.[1]

Buzzard was temporarily shutdown twice in late 2019 for repairs to topside pipework.[5][6]

References
  1. "Hebron". nalcorenergy.com. 2012. Retrieved 2013-05-29.
  2. "Offshore Oil and Gas Activity". Oil and Gas Authority. Retrieved 25 November 2019.
  3. "Offshore Technology - Buzzard Field". Offshore Technology. Retrieved 24 November 2019.
  4. Process Sketch Oil and Gas export (2006)
  5. "Buzzard Oil Field shutdown for repairs". Energy Voice. 4 October 2019. Retrieved 25 November 2019.
  6. "Buzzard oil field shutdown again as repairs compromised". Energy Voice. 21 October 2019. Retrieved 25 November 2019.

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