The Tolmount gas field is a natural gas reservoir and production facility in the UK sector of the southern North Sea, about 36 km of east of Flamborough Head, Yorkshire. It is due to start production in 2022.

Tolmount gas field
CountryUnited Kingdom
RegionNorth Sea
Location/block42/28d
Offshore/onshoreOffshore
Coordinates54°02’24”N 00°26’24”E
OperatorHarbour Energy
PartnersDana Petroleum, Harbour Energy
Field history
Discovery2011
Start of productionTBC
Production
Estimated gas in place1,000×10^9 cu ft (28×10^9 m3)
Producing formationslower Leman Sandstone

The field

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The Tolmount field extends over UK offshore Blocks 42/28c, 42/28d and 42/28e. The field was discovered in 2011 by well 42/28d-12 drilled by the Ensco 92.[1] The reservoir is a lower Leman Sandstone formation and has reserves of 1,000 billion cubic feet (bcf), 540 bcf in the main field, 220 bcf in Tolmount East and 150 bcf in Tolmount Far East.[2]

The Tolmount gas field is jointly owned by Dana Petroleum (50%) and Harbour Energy (50%), ODE Asset Management Limited operates the platform infrastructure.[3]

Development

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Production from the field will be developed in stages. In the first stage (Tolmount Main) gas is produced by an offshore platform and piped to Easington gas terminal.[4] Later stages will entail development of other parts of the field such as Tolmount East produced back to the platform.[5]

Details of the field infrastructure are as shown.[1][2][4][5][6]

Tolmount installations
Platform name Tolmount Tolmount East
Installation type Fixed Steel platform Subsea wellhead
Coordinates 54°02’24”N 00°26’24”E 54°3'55"N 0°28'42"E
Function Integrated minimum facilities wellhead and production Wellhead
Crew Not permanently attended
Year commissioned 2021 2023?
Water depth, metres 50
Design (FEED) Wood Group
Design and Construction Rosetti Marino Ravenna Italy
Jacket weight, tonnes 2,350
Topsides dimensions, metres 32 x 34
Topsides weight, tonnes 1,456
No. of legs 4
No. of well slots 6
No. of Wells 4 1
Gas processing capacity 300 MMSCFD
Production to Easington terminal Tolmount platform
Pipeline length and diameter 48.4 km, 20-inch 4 km, 12-inch
Pipeline Number PL4849
Methanol import Piggyback on 20-inch line Umbilical
Pipeline length and diameter 48.4 km, 3-inch 4 km,
Pipeline Number PL4850

The gas pipeline is known as the Humber Gathering System. It is intended that other prospects in the area, e.g. Mongour, can use the system.[2]

In addition to the Tolmount offshore facilities a new gas process facility was constructed at the Easington terminal to receive and treat the gas prior to shipment into the National Transmission System.[2]

See also

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References

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  1. ^ a b "Tolmount prospect North Sea". www.offshore-technology.com. Retrieved 21 December 2021.
  2. ^ a b c d "Tolmount: all for one, one for all". wirelinemagazine.co.uk. Retrieved 21 December 2021.
  3. ^ "Tolmount Project". www.ode-ltd.com. Retrieved 4 October 2019.
  4. ^ a b "Tolmount to Easington pipeline". assets.publishing.service.gov.uk. Retrieved 21 December 2021.
  5. ^ a b "Tolmount East Development Environmental Statement" (PDF). www.harbourenergy.com. Retrieved 21 December 2021.
  6. ^ "OGA interactive Maps". ogauthority.maps.arcgis.com. Retrieved 21 December 2021.