Intelligent Pigging for Pipeline Integrity

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1 eni s.p.a. upstream & technical services Master in Petroleum Engineering and Operations Intelligent Pigging for Pipeline Integrity Author: Patrick Oghenekome Ejeta San Donato Milanese 13 October 2014

2 Master in Petr.Engineering & Operations Intelligent Pigging for Pipeline Integrity Author Patrick Oghenekome EJETA Company Tutors Antonio SIMONETTI Paola CIOFFI Division eni S.p.A. Upstream & Technical Services Dept. MAIN/PROD University Tutor Prof. Francesca Verga services 2 San Donato Milanese 13 October 2014

3 List of Content Stage Subject Intelligent Pigging for Pipeline Integrity Project Scope Pipeline Integrity Intelligent Pigging (MFL & UT) Case Study: Prezioso-Perla sea line Asset Description Pigging Feasibility Conclusions services 3

4 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 services 4

5 List of Content Stage Subject Intelligent Pigging for Pipeline Integrity Project Scope Pipeline Integrity Intelligent Pigging (MFL & UT) Case Study: 4 Prezioso-Perla service line Asset Description Pigging Feasibility Conclusions services 5

6 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 services 6

7 List of Content Stage Subject Intelligent Pigging for Pipeline Integrity Project Scope Pipeline Integrity Intelligent Pigging (MFL& UT) Case Study: 4 Prezioso-Perla service line Asset Description Pigging Feasibility Conclusions services 7

8 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 pig propels 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 tool travels Data recording: records sensor measurement for later playback Batteries: Provide power for ultrasound sensor and data recording services 8

9 Intelligent Pigging Magnetic Flux Leakage No flux leakage Leakage of flux due to external metal loss 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 services 9

10 Intelligent Pigging Ultrasonic Technology Directly measures the thickness of pipe wall with ultrasonic waves Reflection times from the inner and outer wall measured and is indication of pipe wall thickness Coupling fluid is required i.e. water, oil High accuracy measurements MAOP = 0.72 SMYS 2t/D services 10

11 List of Content Stage Subject Intelligent Pigging for Pipeline Integrity Project Scope Pipeline Integrity Intelligent Pigging (MFL & UT) Case Study: 4 Prezioso-Perla service line Asset Description Pigging Feasibility Conclusions services 11

12 4 Prezioso-Perla service line Operator: Eni Mediterranenan Bottom Depth: 45 m Long: Lat: services 12

13 List of Content Stage Subject Intelligent Pigging for Pipeline Integrity Project Scope Pipeline Integrity Intelligent Pigging (MFL & UT) Case Study: Prezioso-Perla service line Asset Description Pigging feasibility Conclusions services 13

14 Asset Description CROPP Perla: 3 12 km (diesel) Perla Prezioso: 4 17 km (diesel) services 14

15 List of Content Stage Subject Intelligent Pigging for Pipeline Integrity Project Scope Pipeline Integrity Intelligent Pigging (MFL & UT) Case Study: Prezioso-Perla service line Asset Description Pigging feasibility Intelligent Pig Technologies Conclusions services 15

16 Pigging Feasibility Clamp installed to reduce pressure loss Leakage along the 4 sea line and therefore the line must be inspected to check the internal condition services 16

17 Pigging Feasibility 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 services 17

18 Pigging Feasibility Technologies Company Intelligent Pig InVista TM 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) services 18

19 Pigging Feasibility Technologies InVista UT tool 4 RoCorr MFL 4 RoCorr UT UT Piglet CPIG HR4 MFL (NWT& HWT) 4 UT -NWT services 19

20 Pigging Feasibility Technology Selection services 20

21 InVista Ultrasonic Intelligent Pig 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 services 21

22 List of Content Stage Subject Intelligent Pigging For Pipeline Integrity Project Scope Pipeline Integrity Intelligent Pigging (MFL & UT) Case Study: 4 Prezioso-Perla service line Asset Description Pigging Feasibility Conclusions services 22

23 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. services 23

24 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. services 24 San Donato Milanese 13 October 2014