ageing assets: viable options to mitigate corrosion using
TRANSCRIPT
© Flexlife 2016ENGINEERING • DELIVERY • INTEGRITY • TECHNOLOGY
Subsea Springboard
Ageing Assets:
Viable options to mitigate corrosion using advanced polymeric solutions
1© Flexlife 2017
© Flexlife 2016ENGINEERING • DELIVERY • INTEGRITY • TECHNOLOGY
Background
2
• Increasing demands being placed upon
infrastructure due to field life extension
• Increasing financial pressure due to lower
oil/gas prices
• Requirement to address integrity concerns
– Safely
– Innovatively
– Cost Effectively
• Corrosion within I-J Tubes
• Temporary Pipeline Isolation
• Leaking/Passing Lower J-tube Seals
© Flexlife 2016ENGINEERING • DELIVERY • INTEGRITY • TECHNOLOGY
FlexGelLD - Riser Corrosion Protection Case Study
3
• 2 rigid risers routed through a J-tube,
UKCS platform
• WI riser suffered catastrophic failure
due to CUI (Corrosion Under Insulation)
• Adjacent GL riser inspected and found
to have significant wall loss in the
splash zone
• Options
• Replace J-tube
• >£2m
• FlexGelLD
• £120k
Camera Image B.22: View on riser showing disbondment
Camera Image B.23: View on riser showing disbondment at FlexGel level
Talisman Tartan Alpha FlexGel Deployment Report
Doc. No: FLX-TAL-002-PRO-15635-r1 Page 29 of 35
Camera Image B.22: View on riser showing disbondment
Camera Image B.23: View on riser showing disbondment at FlexGel level
Talisman Tartan Alpha FlexGel Deployment Report
Doc. No: FLX-TAL-002-PRO-15635-r1 Page 29 of 35
© Flexlife 2016ENGINEERING • DELIVERY • INTEGRITY • TECHNOLOGY
FlexGelLD - Riser Corrosion Protection Case Study
4
• Displacement of Seawater
• Replacing seawater with non corrosive gel
• FlexGel®
• Developed to prevent corrosion of risers in I tubes and
Caissons
• Immiscible in water
• Non flammable
• Density is ‘tuned’ to prevent oxygen reaching breach
site(s)
• Contains biocide to also arrest Microbial Induced
Corrosion MIC
• Arrests all corrosion
• Approved by OCNS
© Flexlife 2016ENGINEERING • DELIVERY • INTEGRITY • TECHNOLOGY
FlexGelLD - Riser Corrosion Protection Case Study
5
• Camera and hose tethered as FlexGel® pumping
takes place
• FlexGel® displaces water line within I-tube
• Moves within I-tube according to tidal range
• Unaffected by short period wave action
• Prevents further corrosion of damaged pipe
• Schedule inspection regime to ensure Gel remains
intact
© Flexlife 2016ENGINEERING • DELIVERY • INTEGRITY • TECHNOLOGY
FlexGelLD - Riser Corrosion Protection Case Study
6
© Flexlife 2016ENGINEERING • DELIVERY • INTEGRITY • TECHNOLOGY
FlexGelXLD – Pipeline Isolation Case Study
7
• Leaking rundownline within confines of platform leg,
-70m below gas tight floor
• Inaccessible
• Hazardous location
• Emergency mobilisation
• 12 days from initial discussion to offshore
mobilisation
• Adaptation of FlexGelLD Product
• Tuned SG
• Cross-Linking Chemical
• Injected as a liquid
• Cures to form an elastic solid
© Flexlife 2016ENGINEERING • DELIVERY • INTEGRITY • TECHNOLOGY
FlexGelXLD – Pipeline Isolation Case Study
8
GLS$$4$m3$
L(Gel$Base$4.5$m3$
L(Gel$Base$4.5$m3$
Mixing$IBC$1$
2’’$Diaphragm$Pump$
2’’$Sureclean$Pump$
2’’$Sureclean$Pump$
3’’$inlet/$2’’$Outlet$Sureclean$Pump$
Mixing$IBC$2$
Hoses$
Mixing$Skip$
Mixer$
Tote$Tanks$
Pump$
16’’$P1007$
Pipe$Deck$EL+$192$m$
2’’Valve$EL$+98$m$
• FlexGelXLD installed into rundownline
• Production reinstated
• Repaired externally
• FlexGelXLD blown out of rundownline into subsea cells
© Flexlife 2016ENGINEERING • DELIVERY • INTEGRITY • TECHNOLOGY 9
Innovative Polymer Based Solutions
• For discussion:
• FPSO Flexible riser, within I-
tube damaged at splash
zone
• Or J-tube with passing lower
seal leading to inhibitor
leaching and corrosion
© Flexlife 2016ENGINEERING • DELIVERY • INTEGRITY • TECHNOLOGY10
Innovative Polymer Based Solutions
• Inject floating, liquid
FlexGel XLD
• Comprises base chemical
• Plus activator
• Injected from topsides
© Flexlife 2016ENGINEERING • DELIVERY • INTEGRITY • TECHNOLOGY11
Innovative Polymer Based Solutions
• Overtop FlexGelXLD with
FlexGelLD
• Or, benign liquid with lower
SG than FlexGelXLD
© Flexlife 2016ENGINEERING • DELIVERY • INTEGRITY • TECHNOLOGY12
Innovative Polymer Based Solutions
• FlexGelXLD is held in position by FlexGelLD
• Minimal differential pressure
• Unaffected by changing vessel draft
• FlexGelXLD cross-links forming an elastic, solid, ploymeric plug at J-tube base
• No need for replacement– Or vessel intervention
• Internal inspection still possible.
© Flexlife 2015 13