From installation to decommissioning: Heerema and the Jotun B platform

Jotun-B jacket removal Sleipnir 2020 (2)
Jotun-B jacket removal Sleipnir 2020 (2)
Offshore decommissioning

Jotun B platform removal

Removing the Jotun B platform from the North Sea over two campaigns with Thialf and Sleipnir

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At a glance

  • Engineerging, preparation, removal, and disposal (EPRD) contract for the removal of Vår Energie’s Jotun B platform
  • Topside campaign with Thialf in 2018
  • Four-day jacket campaign with Sleipnir in 2020
  • Overall weight of 19,300 metric tons removed
  • 8,100 metric ton record-breaking single jacket lift
  • Topside and jacket will be recycled at the AF Miljøbase decommissioning site in Vats, Norway

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With over fifty years of experience in transporting, installing, and removing offshore infrastructure you can rely on Heerema.

Sleipnir Jotun B jacket rmeoval 2020 (2)
Sleipnir Jotun B jacket rmeoval 2020 (4)
Jotun-B jacket removal Sleipnir 2020 (1)
Jotun-B jacket removal Sleipnir 2020 (2)
Jotun-B jacket removal Sleipnir 2020 (3)
Sleipnir removing the Jotun B jacket

Lifting the 8,100 metric ton jacket

Sleipnir removing the Jotun B jacket

Removing the 8,100 metric ton jacket

Sleipnir with the Jotun B jacket suspended in its cranes

On the way to deliver the jacket for recycling

Sleipnir with the Jotun B jacket suspended in its cranes

On the way to deliver the jacket for recycling

Delivering the jacket for recycling

Offloading the jacket onto the quayside at the AF Miljøbase decommissioning site in Vats, Norway

Sleipnir Jotun B jacket rmeoval 2020 (2) Sleipnir Jotun B jacket rmeoval 2020 (4) Jotun-B jacket removal Sleipnir 2020 (1) Jotun-B jacket removal Sleipnir 2020 (2) Jotun-B jacket removal Sleipnir 2020 (3)
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Removing the Jotun B platform

Heerema’s scope was to provide all Engineering, Preparation, Removal and Disposal (EPRD) activities for the removal of the Jotun B platform in the North Sea. The offshore removal was split over two campaigns. The first removal was the 2019 Thialf campaign to remove the 7,360 metric ton Jotun B topside. Thereafter, in 2020, Sleipnir removed the 8,100 metric ton jacket – a record breaking single jacket lift at the time.

Jotun B Platform

The Jotun Field is located in block 25/7 and 25/8 in the Norwegian sector of the North Sea and is located approximately 180 km west of Haugesund, Norway. The Jotun B wellhead platform was installed by Heerema in 1998, demonstrating the circularity of Heerema’s decommissioning operations.

Thialf topsides removal

Thialf arrived on location on June 23, and started the campaign with the removal of twenty-two conductors that were cut below the seabed by abrasive water jet. These conductors were lifted and cut into four pieces, before being laid on Thialf’s deck. After which, the Jotun B integrated deck topside was removed in a single lift within five hours. Thialf sailed to the AF Miljøbase decommissioning site in Vats, Norway with the topside suspended from its cranes.

Sleipnir jacket removal

For the jacket removal, Sleipnir arrived at the Jotun Field on July 11, and completed the removal one day ahead of schedule on July 16. During the jacket removal, skirt piles with diameters 108” (2.7m) and 80mm wall thickness were cut subsea, the largest ever done in this way. Additionally, Heerema modified an existing 40m long spreaderbar within 2mm length tolerance. The jacket was sailed to Vats suspended in Sleipnir’s cranes, and will now be recycled up to 98%.

Key information

Milestones

Contract signed: December 2016

Topside campaign
Offshore start: June 23, 2019
Offshore end: July 27, 2019

Jacket campaign
Offshore start: July 11, 2020
Offshore end: July 16, 2020

Main spread

Topside campaign
Thialf
Kolga

Jacket campaign
Sleipnir

Main technical data

Topside campaign
DES: 915 metric ton
Conductors: 2,705 metric ton
Skid base: 220 metric ton
Topside: 7,360 metric ton
Conductor Support Frame (CSF)

Jacket campaign
8,100 metric ton
40m long spreaderbar

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Karen Vennik
Karen Vennik

Commercial Manager Decommissioning

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Jotun-B jacket removal Sleipnir 2020 (1)

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