Presentation PPSA Aberdeen November 19th 08

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Wednesday, 19th November 2008
Inspection of offshore pipelines using ultrasonic
PigLet technology
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Topics in this presentation

• The full package on non-piggable lines

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Historical overview

• 1995 Development of UT head, data acquisition
  system and data analysis software.
• 1996 Development of first inspection pigs (cable
  operated) with data analysis software.
• 1996 First ultrasonic pig inspection in the
  field.
• 1999 Introduction of glass fibre cable (PigLet).
• 1999 First dual diameter PigLet in the field.
• 2002 New data acquisition system.
• 2004 New data analysis software
• 2005 Integration of POF-2005 specifications.
• 2006 Introduction of client version analysis
  software.
• 2007 Introduction of Free-Swimming PigLet.
• 2008 Qualification of ILI Operators / Data
  Analysts.

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Example 8 24 PigLet
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Ultrasonic Measuring Principle
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On-line results
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Limitations
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PigLet Strengths
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Full package on non-piggables

• Project management
• Engineering services
• Minor mechanical work
• Pipeline cleaning
• Geometry surveys
• Intelligent Pigging
• Testing
• Defect assessment
• Advice on pipeline repair
• Pipeline Integrity Management (Systems)

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Offshore Inspection project

• Oil Production and water injection pipelines from
  satellite platform to satellite platform.
• Never been pigged totally - No launchers /
  receivers - One cut mitred bends -
  11 non-barred T-joints - High WT (gt20mm)
  WT variations
• Work carried outDe-commissioning, launcher /
  receiver (design/fabrication),cleaning, gauging,
  inspection and assessment.

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Schematic layout platforms
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Typical layout
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Some examples of restrictions
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Mechanical Cleaning
Bare Foam Pig
Hard Brush Foam Pig
Standard cleaning pigs used
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Mechanical Cleaning Pigs
Bidi Stud Pig
HDT Pig
Bidi Brush Pig
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Cleaning Results

• Colour of water changed from black to dark grey
  and light grey before each cleaning pig arrived.
• Duration of water colour change indicates the
  cleanliness of the line.
• Bidirectional stud-pigs are very effective in
  cleaning/scraping the pipe wall surface.
• Most effective pigs to remove deposits are heavy
  brush foam pigs.
• Combination of both led to very successful
  cleaning operations.

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Cleaning Results

• Types of deposits removed per line
• Scale
• Sand
• Wax
• Rust
• Carbon
• Corrosion product
• Deposit samples have been collected and
  handed-over
• for analysis.

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Results of the WI-line
Severe bottom of the line corrosion
Detailed UT B-scan
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Defect distribution of WI-line
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Anomaly distribution WI-line
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Results of the Oil-line
Internal corrosion anomaly (no. 98), min. WT
3.0 mm (depth 73), calculated Psafe 3095 psi
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Defect distribution of Oil-line
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Anomaly distribution Oil-line
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Wednesday, 19 November 2008