SOLA, Norway – Total E&P Danmark has contracted IKM Testing to perform cleaning and preparation for the removal of existing platforms and associated subsea pipelines for the Tyra field complex redevelopment.
The work will be divided into three work packages:
- Satellite Pipeline Flushing - Removal of hydrocarbons in 11 subsea pipelines, using a dedicated support vessel. The pipeline diameters range from 2-16 in., with lengths from 11-22 km (6.8-13.7 mi). All satellite pipelines are due to be re-used for the field redevelopment.
- Interfield Pipeline Flushing - Removal of hydrocarbons in eight subsea interfield pipelines prior to disconnecting risers on Tyra East and Tyra West, incomers from Harald and export to Gorm. The work will be performed from Tyra East and West. Pipeline dimensions from 6-24 in., with lengths from 3-85 km (1.8-53 mi). Some interfield pipelines to be re-used for the field redevelopment.
- Cleaning of Tyra East and Tyra West topsides, and steam cleaning of topsides process equipment on Tyra East and Tyra West.
IKM Testing had a framework agreement since 2000 with Mærsk Olie og Gass, which Total acquired last year, but has never been involved in such an extensive project in the Danish North Sea.
The company claims, however, to have participated in all major Norwegian decommissioning projects to date.
Tyra’s offshore infrastructure is undergoing extensive upgrades because of seabed subsidence. This includes removal of existing platforms and connecting new ones to in-place infrastructure.
Phases 1 and 2 are focused on Tyra West B, C and D with associated walkways and Tyra East B, C, D and E with associated walkways. Phases 3 and 4 will involve placing new topsides on existing jackets that will be extended by 10 m (33 ft) to combat the impact of subsidence.
The new installations will be distributed across two field centers, each comprising standalone process, drilling and living platforms.