Norway Blocks 9/2 & 9/5

Landmark: World’s First Subsea Hinge Over Subsea Template (HOST®) System

Project Overview

• Contract Award: 1996 (East)
• 1998 (West)
• Sales: Kongsberg, Norway
• Fab. Trees: Dunfermline, U.K.
• Fab. Controls: Kongsberg, Norway
• Service Base: Bergen, Norway
• Host Type: Platform
• Contract Type: EPC

Project Characteristics

• No. Trees: 2 (East)
• 2 (West)
• Water Depth: 120 m (390 ft)
• Tree Type: Vertical
• Tree Pressure: 5,000 psi
• Tree Bore Size: 5"x2"
• Hydrocarbon: Oil

Project Ownership

• StatoilHydro 60
• Petoro 30%
• RWE-DEA 10%

Scope of Work

• Four (4) vertical 5"x2" 5,000 psi subsea trees
• One (1) HOST® subsea template
• Four (4) 18-3/4" UWD-II subsea wellheads
• Mechanically oriented tubing hanger (metal seals throughout) run with hydraulically actuated tool
• Stainless-steel block with Inconel-clad production/injection valve seat pockets and ring grooves
• Remote retrievable choke bridge arrangement
• Pressure and temperature transducers on subsea tree and downhole
• Vertical wireline access for production and annulus through tubing hanger/subsea tree
• Diverless make-up flowline and controls umbilical installed by ROVCON®
• Multiplexed electro-hydraulic control system
• 13 km (8 miles) subsea control umbilical
• ROV interface/override facilities
• System integration, testing, installation assistance, service and maintenance

Comments

The Yme Field was discovered by StatoilHydro in 1987. It lies in Blocks 9/2 and 9/5, about 160 km (100 miles) northeast of Ekofisk in the Norwegian North Sea. The jack-up Maersk Giant platform began producing oil from the field in February 1996. Yme ranks as the smallest field off Norway with independent production facilities, and the first StatoilHydro development where the installations are owned and operated by external contractors.

Four (4) wells drilled from the platform produced oil from the Gamma structure. In addition, platform wells for injecting produced water and surplus associated gas to maintain reservoir pressure. The Beta East and Beta West structures were produced through four (4) wells in a subsea template located about 12 km (7.5 miles) from Gamma, with the oil piped to the platform for processing.

The storage ship, which holds up to one (1) mmbo was moored and loaded by the submerged turret loading (STL) system. After being discharged to a shuttle tanker, oil goes to the StatoilHydro Mongstad terminal near Bergen for final processing and fiscal metering. The Yme Field was shut down in 2001.