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2013-2014 Master in Petroleum Engineering and Operations

Intelligent Pigging for Pipeline Integrity

Author: Patrick Oghenekome Ejeta

San Donato Milanese 13 October 2014

eni s.p.a. upstream & technical

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Intelligent Pigging for Pipeline Integrity


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



� Case Study: 4″ Prezioso-Perla service line



� Conclusions

List of Content



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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






� Conclusions

List of Content



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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






� Conclusions

List of Content



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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



� Case Study: Prezioso-Perla service line


� Pigging feasibility

� Conclusions

List of Content



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Asset Description

� CROPP – Perla: 3″ × 12 km (diesel)

� Perla – Prezioso: 4″ × 17 km (diesel)

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� Project Scope



� Case Study: Prezioso-Perla service line


� Pigging feasibility

� Intelligent Pig Technologies

� Conclusions

List of Content



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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






� 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.


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