Integrated oil and gas fields
The Anasuria Cluster, located approximately 175km east of Aberdeen in the Central North Sea, United Kingdom, incorporates the Teal, Teal South, Guillemot A and Cook fields, all of which share the Anasuria floating production, storage and offloading (FPSO) host platform.
The cluster of oil and gas fields is owned and operated by Anasuria Operating Company (AOC), a 50:50 joint venture (JV) between Hibiscus and Ping Petroleum. The JV acquired the project from Shell UK, Shell EP Offshore Ventures, and Esso Exploration and Production UK (ESSO) in March 2016.
The JV has a 100% ownership in the Teal, Teal South, Guillemot A fields, as well as the Anasuria FPSO, and a 38.65% in the Cook field. The remaining 65.35% share in the Cook field is held by Ithaca Energy.
Production from the cluster had commenced in 1996 following the installation of the FPSO that year. The water depth within the project site is approximately 94m.
The main reservoir within the Anasuria Cluster is the Upper Jurassic Fulmar formation, followed by the Triassic Skagerrak formation, the Palaeocene Forties formation and the Upper Jurassic Heather formation sandstones.
As of January 2015, the Anasuria Cluster of fields, excluding the shares of the Cook Field held by Ithaca Energy, were estimated to hold combined proved and probable (2P) reserves of 50.2 million stock tank barrels (MMstb) of oil and 49.4 billion standard cubic feet (Bscf) of gas.
The contingent oil resources are estimated to be 11.2MMstb of oil and 5.6Bscf of gas.
AOC plans to extend the production life of the area by an additional 20 years through workovers, infill drilling activities, upgrade of existing water injection facilities, installation of new water injection facilities, and tie-in with neighbouring facilities including the Kite field, which was discovered in 1993.
The Guillemot A oil and gas field, located in Blocks 21/35 and 21/30, was discovered in 1979 and started production in 1996. It is the largest field within the cluster and integrates five producer wells and a water injection well, with the fifth producer well coming online in May 2014.
The Cook oil and gas field, the northernmost field within the cluster, is located in Block 21/20a. It was discovered in 1983 and started production in 2000 through a single well.
The Teal oil and gas field, located in Block 21/25, started production in 1997 through one production well and integrates two water injection wells.
The Teal South oil and gas field, located in Block 21/25, started production in 1996 through a producer well and integrates a water injection well. The field was shut down in 2012 due to the presence of hydrogen sulphide (H2S). Production from the field is anticipated to be resumed in 2016.
Crude oil produced from these fields is transported by shuttle tankers, while gas is exported by the Fulmar gas pipeline to St Fergus gas terminal in Aberdeenshire.
The Anasuria FPSO is installed within Block 21/25, between the Teal and Teal South fields. It is fixed to the seabed, at a water depth of approximately 89m, by a turret mooring system, and was Shell’s first purpose-built FPSO facility to be installed in the North Sea.
The primary separation and processing facilities of the FPSO include two first stage separators, a second stage and third stage separator each, two HP water injection pumps, and seven oil cargo tanks with a storage capacity of 20,000 million standard cubic metre (mmscm) each. It further incorporates three gas compressors and the platform has a designed processing capacity of 11,000m³/d.
The vessel weighs 125,000t and is equipped with a main control room, a switchgear module, and a helideck.
The JV has contracted Petrofac to provide operations services for the FPSO as well as monitor and manage the pipelines and wells for the 100% owned fields within the cluster, for a term of five years.
Contractors involved with the development of the Anasuria FPSO include SBM Offshore as the main contractor, Stork Protech as the topsides engineering subcontractor, and Mitsubishi Heavy Industries as the barge subcontractor.
Amec performed the fabrication and installation of 22 topside processing facilities weighing approximately 3,500t, whereas the strength and fatigue assessments for the FPSO were conducted by Babcock International.
The mooring installation works were performed by Aker / Heerema, the installation of tie-backs, flexible risers and the Fulmar pipeline tie-in were performed by McDermott, whereas the subsea facilities were installed by Cooper Oil Tools.
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