Subsea Integrity Group

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Subsea Integrity Group Integrity through
Innovation
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Agenda Riser Inspection Technologies

• SIG Overview
• Background to Technology
• Experience
• Guided Ultrasonics
• Defect identification sensitivity
• Applications
• In-Line Inspection Maintenance Capability
• R D Projects 2007/08
• Summary

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SIG Objectives

• SIG is a stand alone company set up by Genesis
  OGC / Technip
• SIG established to develop and operate innovative
  technologies to support integrity management from
  Pig trap to Wellhead
• 3 main product lines for riser pipeline
  integrity
• Intelligent pigging tethered tractor unit
• Non-intrusive Mobile ROV / Diver units
• Non-intrusive Permanent Monitoring Systems
• Focused on Integrity issues within the Industry
• Un-piggable pipelines - Deepwater Risers TOLC
  Tendon Inspection
• Several goals
• Inspection without Intervention
• ILI without shutdown

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Background

• Products are centred around not limited to -
  GWU
• First subsea deployment July 2004 Amerada Hess
• Physics worked client saved 2M
• Genesis GUL have a joint venture on the subsea
  application
• ROV Diver systems have proved very effective
• Clients include - Amerada Hess - Exxon Mobil
  Dana - Shell
• Since 2004 - progressive development into new
  applications
• Includes Intelligent pigging
• Corrosion Monitoring Systems

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Experience
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Guided Ultrasonics
Guided Ultrasonics
Propagation is along and not through the structure
Guided waves reflect off any change in cross
section
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Guided Ultrasonics

• Involves entire pipe
• 100 of volume is inspected
• It is a rapid screening technique
• Needs the pipe walls in order to exist
• Usually exploited at low frequencies (lt100 kHz)
• Exhibit complicated behaviour
• Equally sensitive to increase or decrease of
  thickness
• Amplitude reflection needs to scaled with
  distance
• Temp of pipe up to 120 Deg C
• Pressure limitation to 500bar subsea

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Typical Results Graph
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Defect sizing

• Focusing is an important advance in defect sizing
• Transducers excited with slight time delay
• Allows more accurate circumferential sizing
• Coupled with the volumetric loss known wall
  thickness
• The defect severity can be more accurately
  determined

• Orientation to within 15 Deg can be detected
• 1 wavelength (50mm) is the best resolution i.e.
  defects can be detected - but not sized

Rolled out view of pipe
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Defect sizing

• The technique identifies loss of cross section
  symmetry
• The key is to determine the severity of the wall
  loss
• i.e. localised loss or general corrosion

Severe
Less severe

• Assumptions on defect shape have to be made
• Known failures are well documented
• Failure mechanisms are well documented

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Defect Trials _ Houston
Drill size LCA Comments 0.25
0.625. Initial defect size
0.3125 0.78 Increase of
1/16th 0.345 0.86
Increase 0f 1/32nd
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Defect Monitoring
C Map display Defect Growth can be monitored

• Regular monitoring can drive Intelligent pigging
  programmes
• Modify corrosion inhibitor mix deployment
  method

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Applications
ROV Mobile Clamp
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Permanent Riser Systems
5mm TLPP coating test range 80m
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In-Line Integrity tool

• Original motivation started with deepwater assets
• Lack of external access to the riser/pipe
• Re-think the approach to in-line inspection (ILI)
• Defects are more subtle to locate size
• Need amore controlled level of inspection
• Pipeline systems are more complex to access
• SIG approach is to offer multiple function
• Inspection Cleaning Prevention Repair
  (future)

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In-Line Integrity tool

• 3 Key Features
• Bristle tractor technology to access the pipe
• Guided waves to screen for corrosion
• High Frequency UT array for sizing defects
• Key Advantages
• Designed to work in flow conditions
  (Gas/Multiphase)
• Little cleaning required integrated into main
  tool
• Multi-ton pull loads Bi- directional
  capability
• Maintenance
• Removes/Agitates deposits at the bottom of the
  pipe
• Can inject corrosion inhibition as the tool is
  removed
• Speed is only 2-4m per minute (8-10hrs to TDP)
• Can negotiate complex geometries 3D bends (1.5D
  possible)

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SCR In-Line tool
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SCR In-Line tool
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SCR In-Line tool
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System Overview
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Atlantis Riser Wet Spools

• Tested early November 2006

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Holstein Riser Inspection

• Non-Intrusive
• TSA causes no problems with external GUW testing
• Test limited to joint length due to thread
  connections
• Permanent units could interface with ACE type of
  system
• ROV type deployment probably most cost effective
• Intrusive
• Think - inspection prevention repair
• Flexible sections no cause for concern
• Issues with SIG tool in ID of pipe
• costly to miniaturise electronics

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R D Projects

• Integrity R D Projects for 2007/8
• Insensys Combined riser / flowline stress
  corrosion system
• JENTEK Fatigue damage inspection
• Technip Flexible riser Inspection

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R D 1 Stress / Corrosion clamp

• Joint project with Insensys
• Aim is to develop a joint stress/corrosion system
• Start with a riser system Atlantis wet spools
• Progress into a deepwater subsea flowline unit
• Advantages
• Cost savings in
• deployment, hardware data acquisition
• Correlation of data for better integrity
  assessment
• Fully remote integrity capability
• 3 stage development programme
• Bench unit prototype field unit
• Funding - 400k for fully operational riser unit

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R D 3 SCR Pre-crack Inspection

• Aim is to Inspect SCRs for pre-cracking at welds
• Using JENTEK Sensors
• MWM Array (Magnetic Field) Sensors
• Identifies early fatigue damage in welds
• Pre-crack fatigue detection and imaging
• SIG tool will acts as the delivery vehicle
• Guided waves will position the tool
• JENTEK SIG agreement will be non-exclusive

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R D 4 Flexible Riser Inspection

• Aim is to Inspect the inner carcass pressure
  sheath
• High resolution acoustic images
• Only a slight modification to the current design
• Bristle tractor delivers the inspection head
• High frequency UT head does 3D mapping
• Head is positioned at the front of the tractor
• Fluid slug at the head of the tractor
• Looking for
• Gross damage/erosion
• Separation of inner carcass links
• Disbonding of pressure sheath

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Summary

• Guided Ultrasonics has a valuable role subsea
• Flexible enough to be deployed from pig trap to
  wellhead
• Only modification is data interface Deployment
• Easy integration with subsea Ops little tooling
  required
• Change in mindset needed by Operators
• Getting transducers onto new pipe before
  installation !!
• Development Operations team may have different
  objectives
• Applications
• TOLC - SCR / TTR - Deepwater tie backs - TLP
  tendons
• Goal - Inspection without Intervention !!

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• Questions