The Ettrick field is located in the outer Moray Firth, about 120km north-east of Aberdeen in blocks 20/2a and 20/3a in the UK sector of the North Sea. The field is operated by Nexen with an 80% working interest. Other co-venturers include Bow Valley Energy with 12% and Atlantic Petroleum with 8%. Discovered in 1981, Ettrick was appraised by seven wells between 1982 and 1985.
“The Ettrick field is located in the outer Moray Firth, 120km north-east of Aberdeen.”
FPSO
The development plan includes drilling three production wells tied back to a floating production, storage and offloading vessel. The group awarded Bluewater a contract for the production facilities and operations. Bluewater will design, supply and operate the FPSO including topsides and a disconnectable turret mooring system.
The FPSO is based on the newly built, Aframax-size FPSO hull Aoka Mizu, which is undergoing an extensive conversion programme for the project.
The Aoka Mizu has a length of 248.12m, a 42m moulded breadth and a 21.2m moulded depth. It has a 14.9m design draft and a deadweight of 105,000dwt. The vessel has a 7,985m² deck area, a 6,000m² topsides and a 8,000t deck payload.
ETTRICK PROCESS PLANT
The process plant has a 35,000bpd fluid capacity and a 30,000bpd crude production capacity. It has an 18-million-cubic-feet-a-day gas lift facility. Treating seawater for injection into the reservoir, mixed with produced water at a rate of 55,000bpd.
“The development plan includes drilling three production wells.”
Gas can be exported at 20 million cubic feet a day through a subsea pipeline system. It can offload oil at 5,200m³/h in volumes of 500,000 barrels to tandem moored shuttle tankers. The FPSO has crude storage capacities of 95,000m³ (600,000 barrels).
There are also 7,150m³ (45,000 barrels) slop tanks and 2,982m³ (18,000 barrels) of fuel oil.
The vessel is classified by Lloyd’s Register of shipping with the notation, +100AT, oil barge with descriptive notations Pt higher tensile steel, increased scantlings for longitudinal strength and fatigue for FPSO service in harsh environments, including Norwegian, Canadian and West of Shetland waters. Production from the field is expected to begin in early 2008.
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