Dunlin

The Dunlin cluster of fields is located in Blocks 211/23 and 211/24 of the UK Continental Shelf, some 500km north-northeast of Aberdeen within the East Shetland Basin, and 11.2km from the boundary line with Norway. The Dunlin A platform was installed in 1977, comprising a concrete gravity base (CGB) structure, supporting a steel topsides deck and production facilities. The Dunlin cluster comprises the Dunlin, Dunlin South West, Osprey and Merlin fields . The Dunlin A platform stands on the seabed above the Dunlin field and has served as a production facility for the Dunlin, Dunlin South West, Osprey and Merlin fields.  Oil production from the fields was exported from Dunlin A via pipeline to the Cormorant A platform, and from there by pipeline to the Sullom Voe oil terminal in the Shetland Islands.

The main Dunlin hydrocarbon reservoir and the Dunlin South West hydrocarbon accumulations were reached from wells located on the Dunlin A platform. As separate reservoirs, the Merlin and Osprey fields were accessed by subsea wells located on the seabed. These fields are ‘tied back’ to the Dunlin A platform by a set of two 8 inch diameter subsea pipelines and control lines.

Dunlin A currently also acts as a pumping station for crude oil imports from the Thistle and Murchison fields, which are exported via the Dunlin/Cormorant export pipeline. Two separate 16 inch diameter pipelines import oil from Murchison A and Thistle A to Dunlin A, while a 24 inch diameter oil export line runs from Dunlin A to Cormorant A.

Production from the Dunlin A platform started in 1978, and from Osprey and Merlin in 1991 and 1997 respectively. The Osprey field facilities comprise two subsea drilling templates and a subsea manifold located some 7km north of Dunlin A in water depths ranging from 155m to 165m.  The Merlin field facilities comprise three subsea production wells and a water injection well, located 7km west of Dunlin A in water depths ranging from 155m to 165m.  A 23km long, 119mm diameter electric power cable runs in a seabed trench from the nearby Shell-operated Brent Charlie platform to Dunlin A, through which available electrical power, generated on Brent Charlie can be supplied to Dunlin A.  A 10.2km long, 100mm diameter gas pipeline was installed during 2012 to import fuel gas to Dunlin A from Thistle. The pipeline is trenched and backfilled along its entire length

Dunlin

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