Deepwater spar for VastarNews // June 30, 2000
Aker Maritime in Houston, Texas will be responsible for the engineering, procurement, fabrication and delivery of the complete spar hull and mooring system. The hull will be built at Aker Maritime's yard in Finland.
Final project sanctioning is scheduled for the fourth quarter of 2000, with proposed delivery of the spar scheduled for the second quarter of 2002.
Vastar holds a two-thirds working interest in Horn Mountain field and serves as operator, with Occidental Petroleum Corporation holding a one-third interest.
The Horn Mountain field will be the fifth Gulf of Mexico deepwater field to be developed using spar technology. Aker Maritime has provided the hulls for all three spar platforms currently operating and has recently begun construction on the fourth unit.
Located in Mississippi Canyon Block 127, in water depth of approximately 1,600m (5,400 feet), the Horn Mountain field represents a new water depth record for a floating production system.
Daily production from the field is currently anticipated to peak at 65,000 barrels of oil and 50 million cubic feet of gas.
The hull for Horn Mountain will be 170m (555 ft) tall, with a diameter of 32m (106 ft) and a displacement of 37,000 metric tons. The selected truss spar hull concept features a tubular truss system replacing the lower part of the cylindrical hull compared to a caisson spar, which has a cylindrical hull from top to keel.