Equinor Energy AS let a Troll extension pipeline contract to Allseas Group SA for stage two development of the Troll Phase 3 project in the North Sea.
Phase 3 development will enable gas production from Troll West field via subsea tiebacks to the original Troll A platform, 80 km northwest of Bergen, Norway.
The contract includes fabrication and assembly of multiple pipeline heads and the inline tees, installation and retrieval of counteracts, and flooding, cleaning and gauging of the pipeline system. Execution is planned with the Pioneering Spirit construction vessel in 2026.
For stage two, Allseas will install a 28-km, 36-in. concrete-weight-coated gas line parallel to the first stage pipeline, installed by the Solitaire pipelay vessel in 2020. The new pipeline will contain three inline tees, with one reserved for future tie-in flexibility.
Stage 2 of the Troll Phase 3 project includes eight new wells from two new templates with subsea controls extended from existing templates. A new gas flowline will be laid as a tie-back to the Troll A platform. The project will also perform modification work on Troll A. The first wells are scheduled to come on stream at the end of 2026 (OGJ Online, May 24, 2024).
Equinor is operator of Troll with 30.58% interest. Partners are Petoro AS (56%), AS Norske Shell (8.10%), TotalEnergies EP Norge AS (3.69%), and ConocoPhillips Skandinavia AS (1.62%).
Alex Procyk | Upstream Editor
Alex Procyk is Upstream Editor at Oil & Gas Journal. He has also served as a principal technical professional at Halliburton and as a completion engineer at ConocoPhillips. He holds a BS in chemistry (1987) from Kent State University and a PhD in chemistry (1992) from Carnegie Mellon University. He is a member of the Society of Petroleum Engineers (SPE).
