Gulf of Mexico Blocks EB 642, 643, 688 & 601, 602, 646
Landmark: World’s First Truss Spar
Project Overview
- Contract Award: 2000-2003
- Sales: Houston, Texas
- Fabrication: Houston, Texas
- Service Base: Houston, Texas
- Host Type: Spar
- Contract Type: EPC
Project Characteristics
- No. Trees: 14 +1 (Surface, Non-FMC)
- 13 (Subsea)
- Water Depth: 1,150 m (3,770 ft)
- Tree Type: Enhanced Horizontal
- Tree Pressure: 10,000 psi
- Tree Bore Size: 4"x2"
- Hydrocarbon: Oil/Gas
Project Ownership
Boomvang:
- Shell 50%
- Kerr-McGee 30%
- Devon 20%
Nansen:
Scope of Work
Subsea
- Thirteen (13) enhanced horizontal 4"x2" 10,000 psi subsea trees
- UWD-15 subsea wellhead systems
- ROV installed tree cap
- Integrated a customer-supplied electro-hydraulic production control system
- Flowline connectors, hubs and gate valves for flowline jumpers and sleds
- Tree and tubing hanger running tools
- System integration testing, offshore installation support and technical assistance
Surface
- Fifteen (15) internal hydraulic tieback connectors for spar production risers
- Stress-joint interface design
- Stress-joint integration and testing
- Engineering and offshore installation
Comments
Nansen, located in 1,150 m (3,770 ft) of water, was developed using the world’s first truss spar, which enhances performance while reducing size and cost. The truss spar is a new version of the original Neptune production spar from 1996.
First production was announced in January 2002, less than two years after development was sanctioned. Nansen was developed simultaneously with Boomvang, which set an industry standard for the deepwater Gulf of Mexico. Boomvang, located in 1,050 m (3,450 ft) of water about 15 km (9 miles) from Nansen, also is being developed using a truss spar and came onstream during the second quarter of 2002.
Boomvang Nansen was the world’s first horizontal tree system to have utilized a tubing hanger that houses both the upper and lower crown plugs, eliminating the need for an internal tree cap.