Reconstruction work is progressing on Denmark's largest gas field Tyra. Production from the gas field was temporarily halted before reconstruction began in September 2019.
Since then, the old platforms have been transported ashore and reused, while eight new platforms have been built and installed in the Danish North Sea. Now the reconstruction is in its final phase, and the parties behind it are working at full speed to make Tyra ready to deliver gas.
A crucial part of the final chapter of the Tyra reconstruction is to reopen the 42 wells that connect the gas in the underground with the new Tyra facilities.
About a year and a half ago, each well was secured with a barrier against the gas reservoir, and the old production valves at the top of the well, the so-called "Christmas trees", were removed and sent ashore for renovation. Now the Christmas trees are being reinstalled on top of the wells that will soon be reopened, Total Energies said in a press release.
- This week, our offshore team successfully reinstalled the first 3.2-ton Christmas tree on top of the well. The Christmas tree will control the flow of gas from the well into the new process module when Tyra is back in operation. In the coming months, work will continue to complete the remaining wells, says Lars Bo Christiansen, Deputy Director of the Tyra reconstruction project in TotalEnergies EP Denmark.
40-year-old Christmas trees
Sustainability has been a focus point in the reconstruction. For example, the old Tyra platforms and structures were dismantled and dismantled, which has enabled 98.5 percent of the material to be recycled.
For example, the old legs from the platforms (jackets) and Christmas trees are reused for the wellhead and riser platforms on Tyra II.
- By using highly qualified expertise in Esbjerg and Southern Denmark, it has been possible to reuse several parts for Tyra II. The Christmas trees were originally installed on Tyra in 1984, so they are almost 40 years old, but fortunately the quality is so good that the best solution was to restore and reuse them, says Lars Bo Christiansen.
The supplier Unity, together with other local companies, has renovated the 3-meter-high Christmas trees in Esbjerg.
A key focus in the final phase of the Tyra reconstruction project is the preparation of the new offshore facilities for first gas. This includes reinstalling and opening wells, starting up platforms and systems, connecting facilities to existing infrastructure in the North Sea and ongoing testing.
- We are working at full speed to get the Tyra gas field back into production, and we are pleased to have reached the first important milestones in this final phase of the reconstruction. This week we have completed our first well, but there is still a lot of work left offshore, says Lars Bo Christiansen.
Tyra II is scheduled to be ready for reopening next winter.
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Facts about the reconstruction of Tyra
• TotalEnergies is the operator of the Tyra field on behalf of DUC – a partnership between TotalEnergies (43.2%), Noreco (36.8%) and Nordsøfonden (20%).
• Tyra is Denmark's largest natural gas field. Before the field was closed for reconstruction, it was the center for processing and exporting more than 90 percent of of the natural gas produced in the Danish North Sea.
• Tyra needs to be rebuilt as the seabed beneath the platforms has sunk as a result of many years of extraction from the underlying limestone layer.
• The reconstruction of the Tyra field includes three main elements: Dismantling, recycling and disposal of the old Tyra platforms; Reuse and 13-meter extension of the current legs on six platforms, which will also have new topsides; and a completely new process platform and a new accommodation platform
• When the rebuilt Tyra II is back in production, the field is expected to deliver 2.8 billion cubic meters of gas per year, which corresponds to 80 percent of the expected Danish gas production.
• Tyra II will deliver natural gas with 30 percent less CO2 emissions from production and will make a significant contribution to Danish and European security of supply.
Source: TotalEnergies
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