Dvalin Gas Field, Norwegian Sea, Norway
The Dvalin gas field is located in blocks 6507/7/9 and 6507/8 in production licence 435 in the Norwegian Sea. It is located approximately 15km north-west of Heidrun, 35km south of Skarv fields and 290km from Nyhamna gas processing facility in mid-Norway.
A plan for development and operation of the field, previously known as Zidane, was submitted on 3 October to the Ministry of Petroleum and Energy in Norway. DEA Norge operates the field with a 40% working interest, while Edison (20%), Maersk (20%) and OMV (20%) are partners in the development.
The project marks the first operated field development for DEA in Norway and is estimated to be worth €1.1 billion (Nkr10 billion). The development cost was reduced by more than 20% as a result of efficient management and simplification of the solution.
Initial production from the field is expected in 2020.
Dvalin gas field discovery
The Dvalin field was considered unprofitable in the 1980s due to unsuccessful exploration bids that failed to discover major reserves. A consortium led by DEA as the operator was awarded the PL 435 license in the awards in predefined area (APA) in 2006.
Backed by innovative ideas and approaches, the consortium reported the first major gas discovery in September 2010 as a result of drilling an exploration well in the Dvalin field. The drilling operation was performed using Bredford Dolphin semi-submersible drilling facility and began in May 2010.
A gas-bearing reservoir of 150m thickness was encountered in water depths of 369m towards the east in the Fangst formation. A second exploration well was drilled in the west of the Dvalin field in 2012, resulting in the discovery of additional volumes and encountering a second gas-bearing reservoir of 140m thickness.
Dvalin gas field development details
The development of the Dvalin gas field will comprise a four wells subsea template that will be connected to the Statoil-operated Heidrun platform. Flowlines and umbilicals will be used to secure the template to the platform.
A new 4,500t module for gas processing and compression will be installed at the Heidrun platform to process gas from the Dvalin field. A 14.9km pipeline will be used to supply gas from the field to the Heidrun platform.
The processed gas will be transferred to the Polarled trunk line through a 7.5km pipeline and then sent to the Nyhamna onshore gas terminal to be further processed to dry gas.
The gas will then be shipped to the European market via Gassled. A total volume of 18.2 billion cubic metre (bcm) of natural gas is expected to be produced from the field's reservoirs.
Aker Solutions has been awarded two contracts by DEA for the development of the field that include delivery of the subsea production system and maintenance and services.
The company will supply a production system comprising a manifold, four subsea trees and a 15km-long umbilical to connect to the Heidrun platform. The contract also covers wellheads, controls, tie-in and workover systems. It will also include options for further subsea production tie-backs to Heidrun.
The second contract is meant for maintenance and servicing of the subsea production systems and is a framework agreement for a period of five years. The agreement also includes installation and commissioning services and can be further extended by three-year periods.
The contract is estimated to be worth Nkr900 million ($112.7 million).