Shetland Gas Plant

Natural gas processing plant

Shetland Gas Plant

Location within Shetland

Alternative names| SGP
General information
Type| Gas terminal
Location| Sullom Voe, ZE2 9UN
Coordinates| 60°28′26″N 1°15′41″W﻿ / ﻿60.474°N 1.2615°W﻿ / 60.474; -1.2615
Completed| 2016
Inaugurated| 2016
Technical details
Floor area| 133 acres (0.54 km2)

The Shetland Gas Plant is a natural-gas processing plant in the Shetland Islands, Scotland.

## History

[edit]

The Shetland Gas Plant is the collection and gas processing facility for the offshore Laggan-Tormore project, comprising two large gas and gas condensate fields. The Laggan gas field was discovered in 1986. The Tormore condensate field was discovered in 2007. The development plan for the site was approved in March 2010.

The site was formally opened by Amber Rudd, the Secretary of State for Energy and Climate Change, on 16 May 2016.[1]

## Structure

[edit]

The plant is connected to the Shetland Islands Regional Gas Export Pipeline (SIRGE). The plant was built by Petrofac's Offshore Engineering & Operations unit; Petrofac is a recent constituent of the FTSE 100 Index.[2] The site and pipelines cost around £800m. The gas is exported from the site via a 230 km (140 mi) 30-inch (760 mm) diameter pipe south to the Frigg UK System in Aberdeenshire.

The site is adjacent, to the east, of the Sullom Voe Terminal.

## Operation

[edit]

The Laggan and Tormore gas fields are around 125 km (78 mi) north-west of the Shetland Islands, in sea depths of 600 metres (2,000 ft). Production from the plant began on 8 February 2016. The production from the Laggan-Tormore project is expected to be around 93,000 barrels of oil equivalent per day.

Key data for the Laggan and Tormore fields is as follows:[3][4][5]

Field Name  | Laggan  | Tormore

|
|

Block  | 206/1a  | 205/5a
Coordinates  | 61.045139°N 2.87056°W  | 60.197778°N 3.170139°W (WHPS)

60.913944°N 3.171917°W (Template / Manifold)

Discovered  | 1986  | 2007
Hydrocarbon contact, m TVDSS  | 3909  | 3785 3940
Production  | Gas  | Condensate
Permeability, mD  | 10-20070  | 10-20070
Oil gravity, °API  |  | 52
Oil properties  |  | 0.3 cP viscosity, 0.038%CO2
Gas expansion factor, Sm3/m3 | 289  | 259
Salinity, ppm  |  | 6000-38000
Stock tank oil originally in place, MMstb  |  | 92
Non-associated gas in place, billion cubic feet  | 685  | 346
Operator  | Total  | Total
Water depth, metres  | 600  | 600
Commissioned  | 2016  | 2016
Type  | Subsea steel  | Subsea steel
Function  | Template / Manifold  | Wellhead protection structure (WHPS), Template / Manifold
Number of production wells  | 4  | 2
Subsea weight, tonnes  | 550  | 150 (WHPS), 550 (Template / Manifold)
Topsides weight, tonnes  | 0  | 0
Export  | To Shetland Gas Plant via two parallel 141 km long, 18-inch diameter flowlines

## See also

[edit]

* St Fergus Gas Terminal
* West of Shetland pipeline
* 2016 in Scotland

## References

[edit]

1. ^ Shetland Times
2. ^ Petrofac
3. ^ "OSPAR offshore oil and gas installations inventory". Retrieved 11 December 2023.
4. ^ "Laggan-Tormore: Fast facts and brief history". 8 February 2016. Retrieved 11 December 2023.
5. ^ Clark, J.; Matthews, P.; Parry, C.; Rowlands, M.; Tessier, A. (2020). "The Laggan and Tormore fields, Blocks 206/1 and 205/5, UK Atlantic Margin". Geological Society, London, Memoirs. 52 (1): 967–979\. Bibcode:2020GSLMm..52..967C. doi:10.1144/m52-2018-25. Retrieved 12 December 2023.

## External links

[edit]

* Offshore Technology

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Natural gas infrastructure of the United Kingdom

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