USAN FPSO

• Latitude: 3.57335
• Longitude: 7.39322
• West Africa
• Offshore Terminal in Nigeria

Location: Nigeria

The USAN Floating Production Storage and Offloading (FPSO) vessel operates in the offshore environment of Nigeria, specifically within the USAN Field, which is situated in Oil Mining Lease (OML) 138 about 100 kilometers off the coast in water depths ranging from 750 to 850 meters. Below is a detailed description and specification of the USAN FPSO:

Description:

1. Operator: Total E&P Nigeria Limited (TEPNG).
2. Location: Offshore Nigeria, about 100 kilometers east of Bonny Island in the Niger Delta.
3. Field: USAN Field, within Oil Mining Lease (OML) 138.
4. Water Depth: 750-850 meters.
5. Primary Function: Production, storage, and offloading of hydrocarbons extracted from subsea wells.

Specifications:

1. Dimensions:

   • Length: Approximately 320 meters.
   • Breadth (Width): Approximately 61 meters.
   • Height: Around 32 meters (from keel to main deck).

2. Storage Capacity:

   • Oil Storage: Up to 2 million barrels of crude oil.
   • Production Capacity: Around 180,000 barrels per day (bpd) of oil.

3. Processing Facilities:

   • Oil Processing: Includes separation, stabilization, and treatment systems.
   • Gas Handling: Facilities for associated gas treatment and reinjection.

4. Topsides:

   • Weight: Approximately 30,000 tons.
   • Facilities: Integrated systems for separation, gas compression, water injection, and produced water treatment.

5. Subsea Infrastructure:

   • Wells: Connected to numerous subsea wells via a network of risers and flowlines.
   • Pipelines: Systems for oil export to shuttle tankers and gas reinjection into the reservoir.

6. Offloading System:

   • Offloading Rate: Can offload at a rate of around 900,000 barrels per day to shuttle tankers.
   • Tandem Offloading: Equipped with a tandem offloading buoy system for export to tankers.

7. Accommodation:

   • Living Quarters: Living facilities for up to 140 personnel, including accommodation, offices, and recreational areas.

8. Operational Capabilities:

   • Up-time: Designed for high reliability with minimal downtime, aiming for continuous operation.
   • Station Keeping: Equipped with a mooring system to maintain position in harsh environmental conditions.

9. Safety and Environmental Systems:

   • Firefighting: Comprehensive fire and gas detection and suppression systems.
   • Environmental Protection: Systems to minimize environmental impact, including produced water treatment and gas re-injection facilities to reduce flaring.

10. Deployment and Commissioning:

    • Installation: Deployed using heavy-lift vessels and extensive subsea installation campaigns.
    • Commissioned: Achieved first oil production in early 2012.

Additional Details:

• Design Life: The USAN FPSO is designed for an operational life of around 20-25 years.
• Mooring System: Spread mooring system with multiple anchors ensuring stability.
• Hull Structure: Designed to withstand harsh offshore conditions with robust structural integrity.

In summary, the USAN FPSO is a state-of-the-art offshore production facility that significantly contributes to Nigeria's oil production capacity. It is equipped with advanced processing, storage, and offloading facilities designed to operate efficiently in deep-water conditions.