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eni s.p.a.upstream & technical services
2013-2014 Master in Petroleum Engineering and Operations
Intelligent Pigging for Pipeline Integrity
Author: Patrick Oghenekome Ejeta
San Donato Milanese 13 October 2014
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Intelligent Pigging for Pipeline Integrity
San Donato Milanese 13 October 2014
Author
Patrick Oghenekome EJETA
Division eni S.p.A.
Upstream & Technical Services
Dept. MAIN/PROD
Company Tutors
Antonio SIMONETTI
Paola CIOFFI
University Tutor
Prof. Francesca Verga
Master in Petr.Engineering & Operations 2013-2014
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� Project Scope
� Pipeline Integrity
� Intelligent Pigging (MFL & UT)
� Case Study: Prezioso-Perla sea line
� Asset Description
� Pigging Feasibility
� Conclusions
List of Content
Stage SubjectIntelligent Pigging for Pipeline Integrity
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Project Scope
The scope of work is to underline the operating principles of intelligent pig technologies, investigate the technologies available, and propose a suitable technology feasible for inspecting the 4” sea line connecting Prezioso & Perla platforms
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� Project Scope
� Pipeline Integrity
� Intelligent Pigging (MFL & UT)
� Case Study: 4″ Prezioso-Perla service line
� Asset Description
� Pigging Feasibility
� Conclusions
List of Content
Stage SubjectIntelligent Pigging for Pipeline Integrity
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Pipeline Integrity
� Structural and containment function of a pipeline.
� Pipeline system ability to operate safely and withstand loads during pipeline lifecycle.
� ISO/TS 12747: PIMS as 'management system designed to ensure safe operation of pipeline in accordance with design intent, by control of the physical condition of the pipeline, the operating conditions within the system & changes made within the system.
Onshore Offshore
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� Project Scope
� Pipeline Integrity
� Intelligent Pigging (MFL & UT)
� Case Study: 4″ Prezioso-Perla service line
� Asset Description
� Pigging Feasibility
� Conclusions
List of Content
Stage SubjectIntelligent Pigging for Pipeline Integrity
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Intelligent Pigging
� Standard practice for data collection, and fitness for purpose assessment.
� Maximum allowable operating pressure (MAOP)
•Diameter/Geometry measurments,
•Metal loss,
•Crack detection,
•Pipeline mapping
Data collection
Drive cup: Sealing element, and force exerted by ∆P across pigpropels pig
Source: Magnet assembly or Ultrasonic transducer
Sensors: Measure the TOF or leakage field in MFL or UT tool.
Odometer wheels: Measure inspection speed and distance tooltravels
Data recording: records sensor measurement for later playback
Batteries: Provide power for ultrasound sensor and data recording
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Intelligent Pigging – Magnetic Flux Leakage
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� Flux leakage is a function of corrsoion depth, but also extent
� Wide corrosion produces flux leakage
� Qualitative measurements
� Sensors measure the flux leakage near pipe wall
No flux leakage Leakage of flux due to external metal loss
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Intelligent Pigging – Ultrasonic Technology
� Directly measures the thickness of pipe wall with ultrasonic waves
� Reflection times from the inner and outer wall measured and isindication of pipe wall thickness
� Coupling fluid is required i.e. water, oil
� High accuracy measurements
� MAOP = 0.72 × SMYS × 2t/D
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� Project Scope
� Pipeline Integrity
� Intelligent Pigging (MFL & UT)
� Case Study: 4″ Prezioso-Perla service line
� Asset Description
� Pigging Feasibility
� Conclusions
List of Content
Stage SubjectIntelligent Pigging for Pipeline Integrity
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4″ Prezioso-Perla service line
� Operator: Eni Mediterranenan
� Bottom Depth: 45 m
� Long: 14° 02’ 42.38’’
� Lat: 37° 00’ 31.11’’
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� Project Scope
� Pipeline Integrity
� Intelligent Pigging (MFL & UT)
� Case Study: Prezioso-Perla service line
� Asset Description
� Pigging feasibility
� Conclusions
List of Content
Stage SubjectIntelligent Pigging for Pipeline Integrity
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Asset Description
� CROPP – Perla: 3″ × 12 km (diesel)
� Perla – Prezioso: 4″ × 17 km (diesel)
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� Project Scope
� Pipeline Integrity
� Intelligent Pigging (MFL & UT)
� Case Study: Prezioso-Perla service line
� Asset Description
� Pigging feasibility
� Intelligent Pig Technologies
� Conclusions
List of Content
Stage SubjectIntelligent Pigging for Pipeline Integrity
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Pigging Feasibility
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Clamp installed to reduce pressure loss
Leakage along the 4″ sea line and therefore the line must be inspected to check the internal condition
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Pigging Feasibility
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Last external inspection survey carried out in 2009
on the 4″ sea line reveal or suggest the following
constraints:
� Back-to-back bends
� Riser bends radius ≈ 1.5D
� Pipe not buried but lay on sea bed
� Wall thickness: 6.35 mm with 4.78 mm section
within the sea line
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Pigging Feasibility – Technologies
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Company Intelligent Pig
� InVistaTM Ultrasonic inspection pig
� 4″ RoCorr MFL � 4″ RoCorr-UT HiRes Metal loss inspection tool
� 4″ UT Piglet®
� 4″ HR MFL tool� 4″ HR MFL tool (Heavy wall)
� 4″ UT Normal run (NWT)
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Pigging Feasibility – Technologies
InVista™ UT tool
4″ RoCorr MFL 4″ RoCorr UT
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UT Piglet® CPIG HR4 MFL (NWT & HWT)
4″ UT - NWT
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Pigging Feasibility – Technology Selection
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InVista™ Ultrasonic Intelligent Pig
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� High-fidelity ultrasonic tool� Tool weight ≤ 4 kg� Max. inspection range is 18 km in
standard configuration with lithium cells� Max. run duration: 36 hours
� Min. bend radius: 1D � Direct measurements of pipe wall thickness� Bi-directional capabilities� Low flow and low pressure conditions
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� Project Scope
� Pipeline Integrity
� Intelligent Pigging (MFL & UT)
� Case Study: 4″ Prezioso-Perla service line
� Asset Description
� Pigging Feasibility
� Conclusions
List of Content
Stage SubjectIntelligent Pigging For Pipeline Integrity
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Conclusions
� Ultrasonic tool is by far the best way to check the internal condition of a
pipeline.
� Quantitative sizing of depth of metal loss and remaining wall are
obtainable as compared to magentic flux leakage tools.
� Most MFL tools are prone to errors and can pass through bends ≥ 1.5D.
� The 4″ service line connecting Prezioso-Perla with changing wall
thickness can be inspected using the InVista™ ultrasonic tool with 1D
bend capabilities.
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Acknowledgements
I would thank Eni S.p.A Upstream & Technical
services for permission to present this work and
related results and PROD/MAIN colleagues for the
technical support and needed assistance.
San Donato Milanese 13 October 2014