Johan Sverdrup offshore oil field is located approximately 150km away from the coast of Stavanger, Norway in the Norwegian North Sea. It is considered as one of the biggest oil fields in the Norwegian continental shelf.
The field is jointly owned by Equinor (40.02%, operator), Lundin Norway (22.6%), Petoro (17.36%), Aker (11.5%) and Total (8.4%). The partners are developing the field in two phases, with an estimated investment of approximately Nkr86bn ($10.3bn) on the first phase and Nkr41bn ($4.9bn) on the second phase.
Construction on phase one of the offshore project began in March 2016, while production is expected to start by the end of 2019. Phase two of the project was announced in March 2017.
The plan for operation and development for phase two was submitted to the Norwegian Ministry of Petroleum and Energy in August 2018. The construction on the second phase is expected to begin by the first quarter of 2019, with commissioning scheduled for the fourth quarter of 2022.
The expected production life of Johan Sverdrup field is approximately 50 years.
Johan Sverdrup offshore field discovery, geology and reserves
The Johan Sverdrup oil and gas field is located in the Utsira High, which lies south-west of the Norwegian continental shelf.
It consists of two oil discoveries named Avaldsnes and Aldous, which were discovered in 2010 and 2011 respectively and located at a water depth of 110m-120m.
The field is estimated to contain recoverable reserves between 2.1 and 3.1 billion barrels of oil equivalent.
Johan Sverdrup phase one development details
Phase one of the Johan Sverdrup field development includes the construction of four platforms, three subsea installations for water injection, and oil export pipelines with a total length of 400km. It is expected to produce 440,000 barrels of oil per day (bpd), while the peak production rate is expected to be 660,000bpd.
The produced oil from the production platform will be transported to the Mongstad terminal located in Hordaland through the Mongstad pipeline, while the produced gas will be transported by the Karsto pipeline to the Karsto gas processing plant located in North Rogaland.
The construction work for the phase one began in March 2016. As of August 2018, the installation works for all subsea systems along with three steel jackets for the drilling and processing platforms and the utility-living quarters were completed.
The laying of Mongtad and Karsto oil export pipelines was also in progress.
“Phase one of the Johan Sverdrup field development includes the construction of four platforms.”
Johan Sverdrup phase two development details
The second phase of Johan Sverdrup offshore oil and gas field includes the drilling of 28 wells and construction of one processing platform and five new subsea templates. Modifications to the riser platform and the field centre will also be carried out.
The oil processing platform will weigh 23,000t and consist of three modules including the upper process module, a converter module and the main support frame.
The average production of phase two is estimated to be approximately 440,000bpd, while the peak production capacity is estimated to be 660,000bpd.
Electricity supply for Johan Sverdrup phase two
The phase two development of Johan Sverdrup offshore field will be powered from the shore. A new onshore power converter substation will be constructed at Haugneset, east of Karsto, which will be connected to the converter module of the processing platform.
The power cable system of will consist of two high-voltage power cables with an individual length of 200km. The power cable will link the high-voltage direct current (HVDC) equipment of the processing platform to the HVDC equipment of the onshore converter substation.
Aker Solutions provided front-end engineering and design (FEED) services for the phase two processing platform, while Kvaener provided FEED for the jacket. Aker Solutions and Kvaener are also involved in phase one of the project.
Equinor signed a letter of intent with Aibel in April 2018 to provide engineering, procurement and construction (EPC) services for the topsides of the phase two processing platform under a Nkr8bn ($900m) contract. Aibel is also supplying the drilling platform for phase one.
Equinor also signed a letter of intent with a joint venture between Aker Solutions and Kvaerner for an EPC contract worth Nkr3.4bn ($410m) for the utility module riser of the phase two platform.
Aker-Kvaener JV subcontracted PG Flow Solutions for delivering a mono ethylene glycol and chemical injection pump for the utility module.
NKT, a company based in Denmark, signed a letter of intent with Equinor in October 2018 for a contract worth Nkr1bn ($120m) for the engineering, procurement, fabrication, installation and testing of the cable system for the phase two development. NKT is also undertaking the supply and installation of the power cables for phase one.
Siemens is responsible for supplying electrical equipment, while Kongsberg Maritime was contracted for providing safety and automation systems.
The major contractors involved in phase one development include Samsung Heavy Industries, ABB, IKM Ocean Design, and Odfjell Drilling.