Heather oil field
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| Heather oil field | |
|---|---|
  Location of Heather oil field | |
| Country | United Kingdom |
| Region | northern North Sea |
| Location/block | 2/5 |
| Offshore/onshore | Offshore |
| Coordinates | 60°57′13″N 00°56′23″E / 60.95361°N 0.93972°E |
| Operators | Unionoil, Unocal, DNO, Lundin, Enquest |
| Owner | See text |
| Field history | |
| Discovery | 1973 |
| Start of production | 1978 |
| Peak of production | 1982 |
| Production | |
| Recoverable oil (million tonnes) | 14.1 |
| Producing formations | Jurassic sandstone |
The Heather oil field is a significant crude oil producing field in the UK sector of the northern North Sea, 458 km north-north-east of Aberdeen. Production of oil started in 1978 and ceased in 2019. The Heather Alpha installation is currently (2021) undergoing decommissioning.
The Heather oil field is located in Block 2/5 of the UK North Sea. It is named after the plant that grows extensively on Scottish moors.[1] The Heather field was discovered in December 1973 and comprises a middle Jurassic sandstone at a depth of 9,800 to 11,750 feet (2,9873 to 3,581 m).[2] The reservoir and its fluids had the following characteristics:[2]
| Parameter | Value |
|---|---|
| Porosity | 1.7-19.3 % |
| Water saturation | 21.4-56.3 % |
| API gravity | 35°API |
| Gas Oil Ratio | 650 standard cubic feet/barrel |
| Sulfur content | 0.7 % |
| Recoverable reserves | 90-120 million barrels, 14.1 million tonnes |
Owners and operators
The initial owners of the field were a consortium comprising Unionoil Company of Great Britain (31.25%), Texaco North Sea UK Ltd (31.25%), Tenneco Great Britain Ltd (31.25%), and DNO (UK) Ltd. (6.25%). The field was operated by Unionoil Company of Great Britain.[2] In 1994 the owners were BG Great Britain Limited (31.25%), Texaco Exploration Ltd (31.25%), Unocal Britain Ltd (31.25%), and DNO (Heather Oilfield) Ltd (6.25%). The operator was Unocal.[1] In 1999 DNO became the operator, then Lundin from 2008, and finally Enquest.[3]
