First Remote Retrofit Hottap operation Kjell Edvard Apeland Project Leader Pipeline Tiein amp Repair Statoil ASA kjedapstatoilcom wwwstatoilcom Hot tapping principle methodology First registered patent in ID: 683254
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1
Remote Hot-tap on Åsgard
- First Remote Retrofit Hot-tap operation
Kjell Edvard Apeland
Project Leader Pipeline Tie-in & Repair
Statoil ASA
kjedap@statoil.com
www.statoil.comSlide2
Hot tapping – principle methodology
First registered patent in
1909
by plumber O. H
Netteberg
of Drammen, Norway
SO – WHAT’S NEW?...
Source: www.furmanite.comSlide3
Subsea Hot-tap - Typical permanent works
3Slide4
Statoil’s focused technology efforts
Leading in seismic imaging and interpretation – to increase discovery and recovery
Taking subsea longer, deeper and colder – to accelerate and increase production
Step change in well-construction efficiency – to drill more cost-efficient wells
Pushing reservoir characterisation and recovery to the next level – to maximise value
4Slide5
5
Statoil Strategy - Remote hot tap technology
Statoil 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 systemPhase 2: Retrofit Tee technologySlide6
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 capabilityOffshore training of PRS personnel – improved emergency preparedness for pipeline repair
Statoil Strategy - Remote hot tap technologySlide7
Statoil Strategy - Remote hot tap technology
Creating business opportunities
Diver assisted hot tap
Remote hot tapping
Retrofit Tee hot tap
Jotun
1997
Gullfaks
2000
Tampen Link
2008
145 m
Ormen Lange x 2
2009
860 m
Åsgard SCP
2012
265 m
Gas infrastructure
Re-inforcement
2016Slide8
Qualification Program Outline &
TimescaleDevelopment milestones
1999:
Strategic development project
initiated at Statoil PRS
2008:
Deep water testing to 145 m water depth, first and successful offshore operation, 145 m water depth at
Tampen
Link,
Statfjord 2009:
Deep water testing to 940 m water depth in
Sognefjorden
, World’s deepest remote hot taps (2 off) at 860 m water depth at
Ormen
Lange field
2011:
Deep water testing of Remote Tee Welding Tool to 350 m water depth
2012:
Deep water testing and First offshore use of the Retrofit Tee Technology at 255 m water depth:
–
Åsgard
Subsea CompressionSlide9
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 pipeWelding system contains all functions for making and monitoring the internal weldSlide10
10
Remote Welded Retrofit Tee concept
Retrofit Tee Weld Development & Test Program
API 5L X65 insert pipe with 5mm Inconel 625 cladding
Cooling pipes
Inconel – Alloy 59 welding consumeable
Mock-up for hyperbaric testing in chamber
API 5L X65 mother
In total 9 years of hyperbaric welding qualification
2,5 years Åsgard application targeted qualification
6 pass GMAW /MIG fillet weld22 minutes of arc-on time required to perform the offshore weldingSlide11
Remote Welded Retrofit Tee Installation Equipment
Installation Equipment
Retrofit Tee Installation ToolPipe Handling Frame as carrier for the Tee installation moduleTool weight ~35 Te
Tee weight for Åsgard ~4 Te
Maximum Tee Weight 30 Te
Depth rating: 1000 m
Upgradeable to at least: 2000 m11Slide12
Remote Welded Retrofit Tee Installation Equipment
Installation Equipment
Remote Tee Welding ToolBranch size: 12 inchTool 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 m12Slide13
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!
13Slide14
Deep Water Trials
Nedstrandsfjorden
2012
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!
14
Launching RTWT in Nedstrandsfjorden
The activated and welded Tee recovered to the vessel deckSlide15
Åsgard SCP hot tap campaign 2012
Offshore Installation
Åsgard
Field 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 scheduleSlide16
Offshore Installation video
16
Video clip from offshoreSlide17
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
Future potential
ConclusionsSlide18
Conclusions
Hot 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 IORSlide19
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
20
Åsgard Subsea Compression Hot-tap
Kjell Edvard Apeland
kjedap@statoil.com
Tel: +
4790603869
www.statoil.com
2013-03-05