Williams Field Services - Boomvang/Nansen

Project Details & RCI Activities:

Project Date: June 1999
Location: Boomvang/Nansen East Breaks Pipeline 602/643-GOM

The Nansen and Boomvang fields lie in the East Breaks area of the Gulf of Mexico, approximately 150 miles south of Houston. Nansen lies in East Breaks block 602 and Boomvang lies in block 643. Nansen lies in water depth 3,678', while Boomvang lies in 3,453. Both Nansen and Boomvang were developed with the world's first truss SPARs. The truss design replaces the lower cylindrical hull in order to reduce weight and cost. Each SPAR has a production capacity of 40,000 bbls/day of oil and 200mmcfd of gas. The wells were completed beneath the SPAR and tied back through top-tensioned risers to dry wellheads and trees. Additional tie-ins are incorporated from subsea satellite wells. In total, there are nine top-tensioned production risers and associated equipment for Nansen and five for Boomvang.

The Williams portion of the development consisted of the installation of:

  • One 15-mile 12" oil pipeline from the Nansen SPAR (3,678 FSW) to a pipeline end termination skid (3,086 FSW)
  • One 15-mile 12" gas pipeline from the Nansen SPAR (3,678 FSW) to a pipeline end termination skid (3,086 FSW)
  • One 4-mile 16" oil pipeline from the Boomvang SPAR (3,460 FSW) to a pipeline end termination skid (3,086 FSW)
  • One 4-mile 18" gas pipeline from the Boomvang SPAR (3,460 FSW) to a pipeline end termination skid (3,086 FSW)
  • One 38-mile 16" oil pipeline "BANJO System" from subsea pipeline end manifold (3,086 FSW) to subsea tie-in to existing platform riser on the newly installed GA-A244 "A" platform (365 FSW)
  • One 38-mile 18" gas pipeline "SEAHAWK System" from subsea pipeline end manifold (3,086 FSW) to subsea tie-in to existing platform riser on the newly installed GA-A244 "A" platform (365 FSW)
  • Design, fabrication and installation of 4-pile structure with 3-level deck (1,800 s.tons) in block GA-A244 (365 FSW)
  • Design, fabrication, installation and commissioning of GA-A244 facilities

Project Management Scope of Work:

  • Engineering design review of all export oil and gas pipelines, shallow water risers and steel catenary risers.
  • Attend all integrated project team meetings in representation of client's interests.
  • Review all welding, NDT, coating spooling, factory acceptance test, system integrated test, fatigue testing, installation, pre-commissioning procedures and operations conducted by the EPIC contractor.
  • Develop all final commissioning procedures.
  • Manage engineering effort, review and approve all engineering design for topside client communications, oil and gas sales and pigging systems on each SPAR.
  • Manage engineering effort, review and approve all engineering design for GA-A244 structure and facilities.
  • Perform all activities with procurement, expediting, request for proposals, contracting, fabrication, installation and commissioning for oil and gas sales, communications and pigging systems on SPAR facilities and for the new GA-A244 platform and facilities.
  • Provide cost tracking and final project documentation assembly for all portions of the project.
  • Provide oversight inspection of EPIC contractor's testing, fabrication, FAT operations, installation and pre-commissioning activities. This inspection being on-site in Europe for development and qualification of all pipeline and SCR welding procedures, fabrication of SCR fatigue test joints, test bending of SCR fatigue test joints and actual failure fatigue testing.
  • Provide primary inspection for fabrication, installation and commissioning of GA-A244 structure and facilities.
  • Provide primary inspection for fabrication, installation and commissioning of each SPAR communications, oil & gas sales / interconnect piping and pigging systems.
  • Provide primary inspection for final commissioning of all deepwater oil and gas pipeline systems.

Inspection Scope of Work:

  • Two structural / fabrication / installation inspectors assigned to fabrication of GA-A244 deck and facilities.
  • One I & E inspector assigned to GA-A244 facilities.
  • One I & E inspector assigned to Boomvang and Nansen topside communication, pigging and sales facilities.
  • Two structural / fabrication / installation inspectors assigned to Boomvang and Nansen topside pigging and sales facilities and piping.
  • Three welding / pipeline installation inspectors assigned for client overview of EPIC pipelay contractor activities.
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