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Remote Hot-tap on Åsgard. Kjell Edvard Apeland Project Leader Pipeline Tie-in & Repair Statoil ASA kjedap@statoil.com www.statoil.com. - First Remote Retrofit Hot-tap operation. Hot tapping – principle methodology.

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remote hot tap on sgard

Remote Hot-tap on Åsgard

Kjell Edvard Apeland

Project Leader Pipeline Tie-in & Repair

Statoil ASA

kjedap@statoil.com

www.statoil.com

- First Remote Retrofit Hot-tap operation

hot tapping principle methodology
Hot tapping – principle methodology

First registered patent in 1909 by plumber O. H Netteberg of Drammen, Norway

SO – WHAT’S NEW?...

Source: www.furmanite.com

statoil s focused technology efforts
Statoil’s focused technology efforts

Leading in seismic imaging and interpretation – to increase discovery and recovery

Step change in well-construction efficiency – to drill more cost-efficient wells

  • Pushing reservoir characterisation and recovery to the next level – to maximise value

Taking subsea longer, deeper and colder – to accelerate and increase production

slide5

Statoil Strategy - Remote hot tap technologyStatoil PRS Pool - Haugesund - Norway

  • Emergency preparedness Pool for subsea pipelines
  • Founded in 1987
  • First Diver assisted Hot-tap in 1997
  • First Pre-installed Hot-tap tees installed with Statoil operated pipelines mid 1990’s
  • Initiated Remote Hot-tap development in 1999
    • Phase 1: Remote cutting system
    • Phase 2: Retrofit Tee technology
slide6
Objective:

Remote operation / deep water application / high safety standard

Why important to develop subsea hot tap technology?

Provide full flexibility/independence when selecting tie-in location - cost effectiveness - utilize spare transport capacity in pipeline systems

Ensure distinct technology development in due time to capture business opportunities

Goals:

Increased safety

Reduced cost for future infrastructure development

Increased depth and pressure capability

Offshore training of PRS personnel – improved emergency preparedness for pipeline repair

Statoil Strategy - Remote hot tap technology

statoil strategy remote hot tap technology creating business opportunities
Statoil Strategy - Remote hot tap technologyCreating business opportunities

Gas infrastructure

Re-inforcement

2016

Åsgard SCP

2012

265 m

Ormen Lange x 2

2009

860 m

Retrofit Tee hot tap

Tampen Link

2008

145 m

Gullfaks

2000

Remote hot tapping

Jotun

1997

Diver assisted hot tap

remote welded retrofit tee concept
Remote Welded Retrofit Tee concept
  • Remote installation of a structural reinforcement clamp containing the branch pipe
  • Pressure barrier made by internal weld inside the branch pipe
  • Welding system contains all functions for making and monitoring the internal weld
remote welded retrofit tee concept retrofit tee weld development test program
Remote Welded Retrofit Tee conceptRetrofit Tee Weld Development & Test Program

Mock-up for hyperbaric testing in chamber

  • In total 9 years of hyperbaric welding qualification
  • 2,5 years Åsgard application targeted qualification
  • 6 pass GMAW /MIG fillet weld
  • 22 minutes of arc-on time required to perform the offshore welding

API 5L X65 insert pipe with 5mm Inconel 625 cladding

Inconel – Alloy 59 welding consumeable

API 5L X65 mother

Cooling pipes

remote welded retrofit tee installation equipment installation equipment
Remote Welded Retrofit Tee Installation EquipmentInstallation Equipment

Retrofit Tee Installation Tool

Pipe Handling Frame as carrier for the Tee installation module

Tool weight ~35 Te

Tee weight for Åsgard ~4 Te

Maximum Tee Weight 30 Te

Depth rating: 1000 m

Upgradeable to at least: 2000 m

remote welded retrofit tee installation equipment installation equipment1
Remote Welded Retrofit Tee Installation EquipmentInstallation Equipment

Remote Tee Welding Tool

Branch size: 12 inch

Tool weight: 17 Te

Launching system including Active heave compensation and AHC/CT guide wire winches

Integrated umbilical for lifting, power, gas and control

Depth rating: 1000 m

Upgradeable to at least: 2000 m

deep water trials sognefjorden 2011
Deep Water Trials Sognefjorden 2011
  • Remote Tee Welding Tool tested to 350 m water depth March 2011
  • Test umbilical used
  • Software and quality monitoring not completed
  • Produced 2 complete 6 pass welds with excellent results!
deep water trials nedstrandsfjorden 2012
Deep Water Trials Nedstrandsfjorden 2012

Launching RTWT in Nedstrandsfjorden

The activated and welded Tee recovered to the vessel deck

  • Performed landing towards test/mock-up pipeline on sea-bed (270 msw)
  • Software and quality monitoring finalised and successfully used
  • Problems related to jammed rotation occured during weld number 3 – recoverd, repaired and successfully completed the subsea welding
  • Produced 4 complete 6 pass welds with excellent results!
sgard scp hot tap campaign 2012

Offshore Installation

Åsgard Field 2012

Åsgard SCP hot tap campaign 2012
  • Involved vessel: Skandi Arctic
  • Mobilised 10. of August 2012
  • Demobilised 11. of Sept 2012
  • The newly qualified equipment performed 100%
  • Vessel including tools and organisation performed 100%
  • All offshore works successfully completed a few hours ahead of schedule
offshore installation video
Offshore Installation video

Video clip from offshore

slide17

Conclusions

Future potential

  • The new Remote Welded Retrofit Hot-tap Tee technology has been successfully qualified and field proven
  • Remote Hot-tap technology provides the most flexible tie-in solution avoiding shut down of transport systems
  • Large cost savings can be expected by the implementation of this technology, essential for marginal fields
  • Enabling sales to new markets by use of existing infrastructure (subsea and onshore facilities)
  • Hot-tap enables re-use or shared use of existing risers, useful where all riser slots/J-tubes are occupied
conclusions hot tap connections the most flexible development methodology in the future
ConclusionsHot tap connections – the most flexible development methodology in the future
  • Optimised pipeline routing
  • Avoiding shut-down of critical transport system
  • Improved operational characteristics
  • Enabling new field developments and increased IOR
slide19

Acknowledgements

The authors acknowledge the invaluable contribution of all the Åsgard Subsea Compression project team and the Åsgard Lisence partners:

Statoil acknowledge the vital contributions from the main contractors for the successful Remote Hot-tap testing and operation:

slide20

Åsgard Subsea Compression Hot-tap

Kjell Edvard Apeland

kjedap@statoil.com

Tel: +4790603869

www.statoil.com