West Seno Oil Field

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Indonesia Oil & Gas Fields

Chevron Oil & Gas Fields

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Summary Information

  • Operator: Chevron
  • Country: Indonesia
  • Location: Makassar Strait, offshore East Kalimantan
  • Production start: 2003
  • Partners:
  • Type: Oil & Gas
  • Estimated Reserves:
  • Production Volume:


  • West Seno is located in the Makassar Strait production sharing contract (PSC) area
  • The project was developed in two phases with two tension leg platforms (TLP) and a floating production unit (FPU)
    • Phase 1 includes 28 development wells to recover resources in the northern section of the West Seno field. The TLP supports the 28 development wells and a tender-assist drilling rig. The TLP is linked to the nearby FPU where the produced oil and gas is processed to sales quality.
    • Phase 2 included a second TLP and 24 additional development wells on the field's southern section
  • The FPU has a capacity of 60,000 barrels of oil per day and 150 million standard cubic feet of gas per day. It measures 152 meters in length, 38 meters in width and 12 meters in height.
  • The processed oil and gas is shipped through separate 12-inch submarine pipelines over 62 kilometers from the FPU to the onshore Santan terminal on East Kalimantan
  • West Seno was the first deepwater oil and gas project in Indonesia
  • The Bangka Gas and Condensate Field is tied back to the West Seno FPU


  • Hyundai Heavy Industries:
    • Floating production unit
    • Pipline (2 LINES) : 12” X 6 2 KM
  • Emtunga: Living Quarter Module and Helideck
  • Clough: 'Engineering, procurement and installation of the submarine pipelines and all other installation work, including moorings, piles and tendon legs.
  • NKT Flexibles: Dynamic Risers for production and gas injection


  • 1998 - The field was discovered by Unocal
  • 1999 - Development plans approved
  • 2001 - HHI awarded FPU and TLP contract
  • 2001 - Clough awarded contract for pipelines
  • 2002 - OPIC signed agreement to finance the project
  • 2002 - NKT Flexibles awarded contract for risers
  • 2003 - First oil produced
  • 2016 - Production started on Bangka



  1. Hyundai Heavy Industries Fpso References
  2. Emtunga Offshore Platform References
  3. NKT Flexibles, West Seno
  4. Unocal deepwater Indonesia PSC area declared commercial; plans for West Seno, Merah Besar development approved by Pertamina
  5. Unocal wells extend significant Seno resource offshore Indonesia; development approaches proposed
  6. Clough Group wins $160M share of major new Indonesian oil field work
  7. OPIC announces Indonesian oil projects
  8. Minister launches Unocal West Seno Floating Production Unit hull, signifies progress toward 2nd quarter 2003 oil production
  9. Unocal begins first oil production from deepwater West Seno project offshore Indonesia

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