Case Study: Transocean Arctic Drilling Rig

Location: Hanøytangen Yard, Bergen, Norway

Operator: Transocean AS

During a scheduled shipyard visit we were contracted to remove all Oil Based Mud waste from the double bottom areas onboard to allow inspection.

Sureclean Scope

Primary scope of work was to provide the necessary manpower and equipment for the removal of all Oil Based Mud waste from the double bottom areas onboard the rig, to allow inspection and remedial repairs to be carried out. The total area requiring to be cleaned was estimated at over 2,500 bays, with each bay approximately 1 metre x 3 metre x 1 metre.

Technical Challenge

  • Logistics associated with resourcing, planning and managing project growth, within a critical path
  • Manning profile grew from an original plan of 6 personnel, peaking at 12 personnel, with crew changes occurring every 3 weeks
  • Equipment and consumable resources were required to be mobilised across International waters within a critical timeline


  • Timeline - Critical Path Project
  • Project Management, resourcing, planning and scheduling
  • Conflicting activities
  • Hazardous Environment - Confined Space Entry Working, very narrow access and egress and 1 metre height working conditions with cable trays and pipework obstructing access
  • Magnitude of scope of work – Over 2,500 bays required to be cleaned each with approximate measurements of 1m x 3m x 1m
  • Poor visibility within confined space due to obstructions
  • Hazardous Waste – Removal of Chemicals Hazardous to Health
  • Waste containment and vacuum transfer

Key Achievments

  • Project commenced whilst working offshore in the Norwegian sector and completed during shipyard project
  • Project completed without safety or environmental incident
  • Project completed on time
  • Over 270 Tonnes of Oil Based Mud was removed using vacuum transfer from Double Bottoms and disposed of via client incumbent waste contractor
  • Project scope of work extended and a total of over 47 Tonnes of other waste was removed from other cleaning workscopes onboard using the vacuum transfer system
  • Commendations received from the client

Additional Information

Sureclean’s ethos of having and providing trained ‘multi-disciplined’ personnel provided a timely and cost effective solution allowing the client to optimise work completed. Up to 12 Sureclean personnel were involved, working a total of 149 shifts compromising of both dayshift and nightshift working. The integrated approach of working together adopted by all contractors involved in the project contributed to its overall success.