U.K. Blocks 20/5c, 13/28a, 15/16a
Landmark: U.K.’s First Installation of a Drill-Through Horizontal Tree
Project Overview
- Contract Award: 2001
- Sales: Dunfermline, U.K.
- Fab. Trees: Dunfermline, U.K.
- Fab. Controls: Non-FMC
- Service Base: Aberdeen, U.K.
- Host Type: Semi (Hannay)
- FPSO (Ross)
- Platform (Tartan)
- Contract Type: Frame Agreement
Project Characteristics
- No. Trees: 3
- Water Depth: 140 m (460 ft)
- Tree Type: Enhanced Horizontal
- Tree Pressure: 10,000 psi
- Tree Bore Size: 5"x2"
- Hydrocarbon: Oil
Project Ownership
- Hannay:
- Talisman 86%
- EDC 13%
- First Oil 1%
- Ross:
- Talisman 56%
- ENI 16%
- Paladine 15%
- Intrepid 13%
- Tartan:
- Talisman 100%
Scope of Work
- Three (3) enhanced horizontal 5"x2" 10,000 psi subsea trees
- Concentric all metal-to-metal sealing tubing
- Two (2) 18-3/4" UWD-15 subsea wellheads
- One (1) 13-5/8" subsea wellhead
- Alloy steel block with Inconel 625-clad metal sealing wireline plug
- Gas lift and production chokes
- Tubing Hanger Independent Secondary Lock (THISL)
- Workover control system
- ROV interface/override
- Tool rental
- Diverless workover
- Subsea system approved by the Scottish Fishing
- Federation as a fishing-friendly protection/structure
Comments
Hannay: The Heavy Architecture (HA) productionenhancedhorizontal tree for this well is the secondHannay production well and is located 13 km (8 miles) northwest of the Buchan Alpha production facility.
Ross: This well was the eleventh Ross completion and was the first drill-through enhanced horizontal subsea tree installed in the U.K. It produces to the Bleo Holm FPSO, 2.2 km (1.3 miles) away from the well.
Tartan: The Heavy Architecture (HA) production-enhanced horizontal tree for the Tartan North Terrace was drilled as an exploration well 3 km (2 miles) north of the Tartan platform. Following a positive well test, the subsea tree was run. The well was put onstream in 2004.