Gulf of Mexico Blocks GC 697, 698 & 743

Landmark: World’s First Project Using Hot-Water Hydrate Remediation System

Project Overview

• Contract Award: 2002 (Ph I)
• 2003 (Ph II)
• 2005E (Ph III)
• Sales: Houston, Texas
• Fabrication: Houston, Texas
• Service Base: Houston, Texas
• Host Type: FPS-Semi
• Contract Type: Frame Agreement

Project Characteristics

• No. Trees: 2 (Ph I)
• 6 (Ph II)
• 14 (Ph III)
• Water Depth: 2,060 m (6,760 ft)
• Tree Type: Horizontal
• Tree Pressure: 10,000 psi
• Tree Bore Size: 4"x2"
• Hydrocarbon: Oil/Gas

Project Ownership

• BP 56%
• BHP Billiton 44%

Scope of Work

• Twenty-two (22) horizontal 5"x2" 10,000 psi dual-hub subsea production trees (16 producers, 4 injectors)
• Twenty-two (22) UWD-15 subsea wellhead systems
• Four-slot, four-header production manifolds
• Production, well test and water injection well jumpers
• Retrievable pigging loops
• PLETs and PLET jumpers
• Electro-hydraulic production controls system including:
• Tree-mounted controls
• Hydraulic UTAs (Umbilical Termination Assembly)
• Electrical UTAs
• Associated hydraulic and electrical flying leads for subsea distribution
• IWOCS (Installation and Workover Control System)
• HWHR (Hot-Water Hydrate Remediation System)
• System integration testing, offshore installation support and technical assistance

Comments

The Atlantis Field is located along the Sigsbee Escarpment in the Gulf of Mexico, 240 km (150 miles) south of New Orleans, in 2,060 m (6,760 ft) of water. The field is part of the Southern Green Canyon trend, lying adjacent to the Mad Dog and Neptune discoveries and to the south of Holstein. Based on data from appraisal drilling in the field, Atlantis is now believed to have reserves of 575 mmboe, making it the third-largest field discovered in the Gulf of Mexico. The field will be developed with twenty-two (22) wells. First production is scheduled to begin in 2006.

Atlantis is being developed using a moored semisubmersible with subsea trees tied back to the host using Steel Catenary Risers (SCRs). The produced oil and gas fluids will be exported by means of the Mardi Gras 24" oil pipeline and the 16" natural gas pipeline. The production facilities will be designed for 150,000 bopd, 75,000 bpd of produced water and 180 mmcs/d of natural gas processing capacity. To support the host facility, a separate moored or dynamically positioned deepwater rig (LTDU - Long-Term Development Unit) will be contracted for all drilling, completion and well-intervention work.