Project Profile
Location: P.116 & P.295, Block 30/16, 249km east south east of Aberdeen
Area: 65 km2
Water Depth: 83 m
Peak Production: 10,000 boe/d
Proven and probable reserves: 17 million boe
Start-up year: 1975
The Auk field is located in Block 30/16 at the western margin of the Central Graben. Oil is contained in a combination stratigraphic and structural trap which is sealed by Cretaceous chalk and Tertiary claystones. An oil column of up to 400 ft is contained within Rotliegend sandstones, Zechstein dolomites, Lower Cretaceous breccia and Upper Cretaceous chalk. Production has taken place since 1975 with 80% coming from the Zechstein, in which the best reservoir lithology is a vuggy fractured dolomite where porosity is entirely secondary due to the dolomitization process and leaching of evaporites. Both Rotliegend dune slipface sandstones, and the Lower Cretaceous breccia comprising porous Zechstein clasts in a sandy matrix, also contribute to production. Poor seismic definition of the reservoir results in reliance on well control for detailed reservoir definition. The field has an estimated ultimate recovery of 93 MMBBL with 13 MMBBL remaining at the end of 1988.
The field covers an area of about 65 km2 and is a combination of tilted horst blocks and stratigraphic traps, located at the western margin of the South West Central Graben. The produced oil is exported via the Fulmar platform to the Teesside Terminal. The associated gas is used as fuel on the platform.
The plan for Auk North Redevelopment will include production via three subsea horizontal wells with a subsea manifold, pipelines and riser to be installed. Auk North is expected to yield 10,000 boe/d at peak production, with proven and probable reserves of 17 million boe.
The Auk South Redevelopment will involve nine wells, along with three re-completed wells. There will be a new integrated drilling deck, living quarters and power from Fulmar. Auk South is expected to produce plateau rates of 11,000 boepd from proven and probable reserves of 29 million barrels.
Auk North will come onstream first, followed by Auk South.
Operators:
Repsol Sinopec Resources UK: Operator with 100% interest
Contractors:
Technip UK Limited: EPCI contract
Baker Hughes UK
Fabricom Offshore Services: topside modifications to tie-in the Auk North riser flowline, subsea power and controls systems for the Fulmar A platform
RBG Limited: Maintenance and subsea contract
Prosafe Offshore: Provision of the MSV Regalia accommodation support rig
Wood Group: engineering and modifications services
Stork (Fluor subsidiary): a two-year contract to deliver a range of integrated fabric maintenance services, asset support services, access solutions and specialist services. (July, 2016)
Subcontractors:
Consafe Engineering Services: New accommodation module