Type:
Oil
Facility:
Production
Water Depth:
128
Installed:
1987
meters
Block:
46268
Design:
Fixed steel
Sub Structure:
15900
Topsides Wgt:
13500
tonnes
tonnes
Intro
A fixed steel jacket drilling and accommodation platform forming the upstream part of the Alwyn North complex in the UK Northern North Sea (Blocks 3/9a and 3/4a). Installed in 1985, it provides quarters, drilling support and the main bridge connection to processing. It is linked to the NAB processing platform by a 72–73-m bridge.
Field
The Alwyn North field is a major oil and gas field in the northern UKCS, discovered in 1975. The reservoir comprises Jurassic sandstone units with both oil (Brent Formation) and gas (Statfjord Formation). It produces hydrocarbons for over three decades. The field also acts as the hub for satellite tie-backs.
Facilities
NAA’s primary role is to support drilling operations, well control, living quarters, and bridge-linked utility distribution to the associated processing platform (NAB). Drilling rigs operate from its well bay to access up to around two dozen production and injection wells in the Alwyn North and satellite fields. Accommodation modules house crew and contain control rooms with integrated safety and communications. Power and utilities (electrical distribution, HVAC, water systems, emergency systems) originate here and flow to NAB across the bridge. Bridge connections carry power, fire-gas control, control and safety cabling, and process lines for cross-platform integration. NAA hosts drilling support systems, blowout preventer (BOP) control interfaces, mud/gas separators, and well intervention spaces. Combined with NAB, the twin-platform complex manages multiphase production, fluid separation, gas compression, and conditioning. Treated hydrocarbons are exported: oil via pipeline to Cormorant Alpha and onward to Sullom Voe, and gas via the Frigg UK Pipeline to St Fergus. Utilities include gas-turbine power generation, firewater systems, and produced water handling.
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