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V-LIFE: A Technology for the Rejuvenation of Subsea Insulation Resistance Failures
Subsea Controls Down Under
Neil Douglas October 2016
Copyright © 2016 Viper Subsea, All Rights Reserved Viper Subsea Confidential & Proprietary Information
Introduction
The next four slides are a copy of what was presented at SCDU in 2011.
The subsequent slides reflect Viper Subsea’s technology development initiated in part by the subsequent discussion at that SCDU Conference
Copyright © 2016 Viper Subsea, All Rights Reserved Viper Subsea Confidential & Proprietary Information
Electrical Failures
Electrical Failures in connectors and cables can result in one of three failure modes:
Short Circuit
Open Circuit
Line Insulation Failure – current leakage to earth
Fault types can be classified as either:
Intrinsic – the fault relates to design, materials or hardware assembly
Extrinsic – the fault relates to handling, installation, environment, mechanical stressing and/or misapplication
Copyright © 2016 Viper Subsea, All Rights Reserved Viper Subsea Confidential & Proprietary Information
Intrinsic Failures
Elastomeric failures (including bellows)
Polyethylene moulding failures (cathodic disbondment)
Nascent Hydrogen in Umbilicals and gassing
Poor soldering (flux, excessive quantity, sharp edges)
Use of incorrect crimping tools
Cracks in epoxy in connectors
Shuttle pin assembly failure
Copyright © 2016 Viper Subsea, All Rights Reserved Viper Subsea Confidential & Proprietary Information
Extrinsic Failures
Calcareous and/or marine deposit around compensation and pin shrouds
Lateral mechanical stresses placed on connectors when cables are installed on structures
ROV impact damage
Connectors left exposed subsea for too long (not properly parked or protected)
Cable sheath damage
Fishing/trawl board impact
Water trees/Electric trees
Water permeation into insulation
Copyright © 2016 Viper Subsea, All Rights Reserved Viper Subsea Confidential & Proprietary Information
Water ingress into electrical cables
Moisture ingress can occur in long-term wetted cables and results in:
Decrease in dielectric strength
Increase in leakage currents
Continual degradation leading to eventual failure
≈ 73% of all subsea electrical failures
Copyright © 2016 Viper Subsea, All Rights Reserved Viper Subsea Confidential & Proprietary Information
Subsea Electrical Integrity Management
Two Approaches:
Fault Location, Monitoring and Analysis
Fault Remediation
Copyright © 2016 Viper Subsea, All Rights Reserved Viper Subsea Confidential & Proprietary Information
V-IR : Subsea Integrity Monitoring
JIP established with five Super Majors as sponsors
Development of key V-IR system components:
V-LIM Topsides Line Integrity Monitor
V-SLIM Subsea Line Integrity Monitor
V-NET Subsea-to-surface communications system
Shallow water trial started Q2 2016
Copyright © 2016 Viper Subsea, All Rights Reserved Viper Subsea Confidential & Proprietary Information
Subsea-to-Surface Communications
V-SLIM to V-LIM communications system
V-NET
Copyright © 2016 Viper Subsea, All Rights Reserved Viper Subsea Confidential & Proprietary Information
V-LIM – Line Integrity Monitoring
High accuracy and high stability monitoring
• IR Monitoring 1kohm to 1Gohm
• Capacitance
• Dielectric Absorption Ratio
• Polarisation Index
• Voltage, Current, Power, Frequency
Acts as a topside modem for V-NET
Incorporates V-LIFE hardware
EC, UL, FCC, RCM Approved
Copyright © 2016 Viper Subsea, All Rights Reserved Viper Subsea Confidential & Proprietary Information
V-LIFE
V-LIFE is a scientific breakthrough and an established offering by Viper Subsea.
Innovation & Technology
Copyright © 2016 Viper Subsea, All Rights Reserved Viper Subsea Confidential & Proprietary Information
Example of a V-LIFE Restart
Copyright © 2016 Viper Subsea, All Rights Reserved Viper Subsea Confidential & Proprietary Information
Insulation – pre-passivation
Copyright © 2016 Viper Subsea, All Rights Reserved Viper Subsea Confidential & Proprietary Information
Insulation – post passivation
Copyright © 2016 Viper Subsea, All Rights Reserved Viper Subsea Confidential & Proprietary Information
Passivated cable with approximate pore position
Copyright © 2016 Viper Subsea, All Rights Reserved Viper Subsea Confidential & Proprietary Information
Confidential
Copyright © 2016 Viper Subsea, All Rights Reserved Viper Subsea Confidential & Proprietary Information
1074
706
620 639
396
207
108 73
23 3 1 0
200
400
600
800
1000
1200
No. of Subsea Trees by Region
Existing Subsea Installations
Copyright © 2016 Viper Subsea, All Rights Reserved Viper Subsea Confidential & Proprietary Information
0
1
2
3
4
1996 1998 1999 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015
Year On Stream vs Number of Projects
Australian Subsea Installations
Copyright © 2016 Viper Subsea, All Rights Reserved Viper Subsea Confidential & Proprietary Information
Australian Subsea Installations
0
5
10
15
20
25
30
35
40
1996 1998 1999 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015
Year On Stream Vs Number of Wells
Copyright © 2016 Viper Subsea, All Rights Reserved Viper Subsea Confidential & Proprietary Information
Copyright © 2016 Viper Subsea, All Rights Reserved Viper Subsea Confidential & Proprietary Information
What’s the next innovation in electrical integrity?
Confidential
24 LiveWire Proprietary Information
SSTDR: Spread Spectrum TDR
×
∫
Reflected Modulated
PN code unknown time shift
Incident Modulated
PN code
SSTDR Signature
Copyright © 2016 Viper Subsea, All Rights Reserved Viper Subsea Confidential & Proprietary Information
CableGuardian™
A system of distributed units providing constant:
Monitoring and trending of cable integrity and basic electrical parameters
Identification and location of:
Short circuits
Open circuits
Intermittent faults
Insulation Resistance degradation
The first platform to provide live fault location
information for both insulation and conductor faults