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Installation of CRA multiphase pipe-in-pipe (PIP) and gaslift pipelines necessary to increase capacity utilising existing infrastructure in the North Sea’s Greater Ekofisk Area.
Company: ConocoPhillips Skandinavia AS
Location: Greater Ekofisk Area, southern Norwegian North Sea
80 m
Max. water depth
Scope of work
- Installation of 16/22-inch multiphase PIP pipelines (6.8-km and 0.7-km respectively)
- Installation of two 0.7-km, 6-inch Gaslift pipelines
- Design, fabrication & installation of multiple 16-inchCRA/Duplex PLEM/PLET/bulk-head structures
- Fabrication of CS 6-inch PLEM/PLET structures
- Fabrication & installation of mattress to safeguard cable crossing locations, & GRP covers to protect the subsea structures
- Support activities (incl. pre-lay and post-lay surveys, crossing preparations)
- Trenching of multiphase flowline and water injection pipeline
- Pre-commissioning of all four pipelines
16/22-inch
multiphase PIP pipelines
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Specials & challenges
- Design, fabricate & install PIP system in Pioneering Spirit’s firing line
- First-time use of Allseas in-house developed FJC PP sheet wrapping machine
- First-time installation of large PLEM/ILT structures with Pioneering Spirit
- Installation of CRA pipeline with first-time use of
- surface tension transfer technology (STT) for root pass welding
- Pipeline start-up with PLEM configuration next to drill rig
- Installation of 6-inch pipeline with Pioneering Spirit in low tension mode
- Design & fabrication of CRA/Duplex PLEM/ILT structure
6-inch
pipeline with Pioneering Spirit in low tension mode
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