Sigyn
- Type: Rig
- field
- Latitude: 58.2844644
- Longitude: 2.0559263
Location and Geology
- The Sigyn field is situated in block 16/7 in the central part of the Norwegian North Sea, approximately 12 kilometers southeast of the Sleipner A platform.
- The field is at a water depth of 70 meters and the reservoirs are located at a depth of 2,700 meters in the Triassic sandstone of the Skagerrak Formation.
Ownership and Operatorship
- Equinor Energy is the operator of the field, holding a 60% stake. ExxonMobil Exploration and Production Norway holds the remaining 40%.
- The operatorship was transferred from ExxonMobil Norway (Point Resources) to Equinor in July 2017.
Development and Production
- The plan for the development and operation of the field was approved in 2001, and production started in 2002. Initially, the field was expected to produce for ten years, but the production phase was later extended until 2022.
- The field was developed using a subsea template with three wells tied to the Statoil-operated Sleipner A facility via two flow lines.
Reserves and Production
- The Sigyn field contains 5.6 billion standard cubic meters of gas, 2.6 million tonnes of natural gas liquids (NGL), and 5.6 million standard cubic meters of condensate.
- The Norwegian authorities allocated Sigyn to supply 2.3 billion cubic meters of gas during 2002-2003 as part of a gas sales contract agreed in June 2001.
Production Systems
- The subsea production systems include control systems, Christmas trees, wellheads, and related seabed equipment. Production can be remotely operated from the Sleipner A platform.
- Dry gas from the Sleipner A facility is exported to the market using the Sleipner Riser via the Gassled pipeline infrastructure. Condensate is transported to the Karsto terminal in Stavanger through a dedicated pipeline.
Field Structure
- The field is divided into two deposits: Sigyn West and Sigyn East. Sigyn West contains gas and condensate deposits, while Sigyn East contains light oil.
- The field is currently in the tail phase of production, with gas injection processes being tested in both deposits to improve recovery.
Investment and Contracts
- The project was developed with an investment of approximately Nkr2.9 billion ($324 million), with an additional Nkr5 million ($0.6 million) anticipated for further investment.
- Several contracts were signed for the development, including those with FMC Kongsberg Subsea for subsea production systems, Reinertsen Engineering for pipeline system engineering, and Itochu for delivering materials for the flow lines. ABB and Coflexip Stena Offshore also secured contracts for modifications and installations related to the Sleipner A platform and seabed template.
Sleipner A Facility
- The Sleipner A facility is an integrated production, processing, and accommodation platform that houses the Sleipner Ost and Sleipner Vest units. The facility features a Condeep type platform with a concrete gravity base structure and 24 cells.
- The original hull of the facility sank during installation in 1991 due to a design flaw but was redesigned and successfully installed in 1993.