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Www.eni.it Eni Ecuador “Smart Foam Pig” first application 2014-07-02 – Rev.0 Alberto Di Lullo, Keith C. Hester eni e&p Flow Assurance Eng. Techn.

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Presentation on theme: "Www.eni.it Eni Ecuador “Smart Foam Pig” first application 2014-07-02 – Rev.0 Alberto Di Lullo, Keith C. Hester eni e&p Flow Assurance Eng. Techn."— Presentation transcript:

1 Eni Ecuador “Smart Foam Pig” first application – Rev.0 Alberto Di Lullo, Keith C. Hester eni e&p Flow Assurance Eng. Techn.

2 Agenda Approach Sensors Preliminary results for pigged pipelines: Villano A – CPF Villano B – Villano A CPF – Sarayacu Sarayacu – Baeza 2

3 Approach  Application of e-splora™ tools:  Autonomous sensors traveling with plastic pigs to gain insight on flowlines.  Pressure (absolute, dP across pig), temperature, acceleration.  Easily applicable in a number of pigging situations.  Minimal pig modifications required.  Able to detect potential problems  Including flow restrictions from solids accumulations, dents, etc.  Unable to determine the cause of a restriction (dents, deposits, …) 3

4 Sensor Types  HT/HP Sensors  Pressure (up to 300 bara)  Temperature (up to 80 o C) 4  HP Sensors  Pressure (up to 200 bara)  Temperature (up to 40 o C)  Acceleration Sensors  Pressure (up to 100 bara)  Temperature (up to 60 o C)  3-axial accelerometer Syntactic foam protective case

5 Villano A – CPF (launched on 24 Jun 2014) 5 Acceleration sensors: 2 front + 2 rear Front and Sensors: 1 protected, 1 “naked” Pre-launch Rear Sensors in place and functional Front sensors torn from the pig As received

6 Villano A – CPF (launched on 24 Jun 2014) 6 The rear pig pressure (the only available sensor data) matches well with the hydrostatic pressure (elevation profile given). Corrections were applied for variable pig speed & unstable rate. Unstable flow

7 Villano A – CPF (launched on 24 Jun 2014) 7 Pig velocity profile along flowline Comparison of values inferred from flowrate with values derived from sensor analysis

8 Villano A – CPF (launched on 24 Jun 2014) 8 By subtracting hydrostatic pressure from the rear pig pressure, the frictional pressure component was extracted showing good linear behavior. Possible feature? Unstable flow

9 9 Preliminary conclusions: 1)The measurement was significantly affected by flow instabilities. Some were tentatively corrected, but some uncertainties remain, both in feature detection and position 2)Front sensors were missing, so that the pressure differential across the pig is not known 3)One possible feature to be checked at about m from VA, potentially where the front sensors might have been torn from the pig  Features have a number of potential causes, including dents, solids (sand) accumulations, and diameter changes Villano A – CPF (launched on 24 Jun 2014)

10 Villano B – Villano A (launched on 24 Jun 2014) 10 HT/HP sensors, 1 rear + 1 front, due to high temperatures Front Sensor Rear Sensor Pre-launch Plugged Holes As received Intact Sensors Rear plug expelled Pig OD = 32.5 cm

11 Villano B – Villano A (launched on 24 Jun 2014) 11 Comparison of Pig Speed obtained by the measured field flow-rate and by matching pig pressure with hydrostatic pressure

12 Villano B – Villano A (launched on 24 Jun 2014) 12 Rear pressure matches the shape of the hydrostatic pressure computed from the elevation profile (Corrections applied for variable pig speed). Possible feature to be checked Possibly due to the unplugging of rear pig hole

13 Villano B – Villano A (launched on 24 Jun 2014) 13 The delta pressure across the pig provides additional indications of possible small restrictions in the line (exact origin of which cannot be inferred from the pig data)

14 Villano B – Villano A (launched on 24 Jun 2014) 14 Preliminary conclusions: 1)The measurement was affected by flow instabilities during start-up. Some of these effects have been corrected. However, some uncertainties remain both in feature detection and position, 2)One possible feature detected at about 130 m from VB, 3)Other smaller features at approximate distances from VB: 230 m 310 m 400 m 525 m 890 m 995 m 1440 m 1670 m 1775 m

15 CPF – Sarayacu (launched on 25 Jun 2014) 15 HT/HP sensors (2 front+rear) and Accel sensors (2 front+rear) Pre-launch HT/HP Sensors Acceleration Sensors Pig OD = 32.5 cm As received Intact Sensors (except for front acceleration sensor)

16 16 CPF – Sarayacu (launched on 25 Jun 2014) Rear pressure matches the shape of the hydrostatic pressure a part from a specific section, which represents an unknown anomaly (Corrections applied for variable pig speed).

17 17 The frictional pressure drop shows anomalies which indicate possible deposits or restrictions. The red arrow indicates a localized anomaly (exact origin of which cannot be inferred from the pig data) CPF – Sarayacu (launched on 25 Jun 2014) Wax deposits

18 18 The deltaP across the pig shows anomalies which indicate possible deposits or restrictions. In blue, valve-induced anomalies. In red, the less explicable ones. (exact origin of which cannot be inferred from the pig data) CPF – Sarayacu (launched on 25 Jun 2014)

19 19 Preliminary conclusions: 1)The pressure data show anomalies which might be attributed to wax deposition, but also inexplicable anomalies were detected (30-35 km) 2)The pressure drop measured across the pig correlates well with the position of several valves, but some other features are to examined more carefully, notably at 92900m approximately 3)The pig stopped at arrival in Sarayacu for several hours. Apparently this is where also the pig recovered in 2004 stopped. This may represent a criticality. 4)The average pig velocity is 0.23 m/s, and about a half of this value before valve#5. This represents another pigging criticality. CPF – Sarayacu (launched on 25 Jun 2014)

20 Sarayacu – Baeza (launched on 27 Jun 2014) 20 HP Sensors: 3 front + 3 rear (Pressure), 1 front (Temperature) Front sensors Rear sensors Pre-launch As recovered, with about 20kg of deposits Sensors all present and functional

21 21 The frictional pressure drop shows anomalies which indicate possible deposits or restrictions (exact origin of which cannot be inferred from the pig data) Sarayacu – Baeza (launched on 27 Jun 2014)

22 22 The delta P across the pig shows further features such as start of wax deposition and other deviations (but pipe welds are never visible) Sarayacu – Baeza (launched on 27 Jun 2014) Onset of wax Deposition? End of wax Deposition? ?

23 23 Preliminary conclusions: 1)The pressure data show anomalies which might be attributed to wax(?) deposition, but also other inexplicable anomalies were detected (e.g. at about km 35) 2)The frictional pressure drop profile is linear overall, but shows localized anomalies 3)The pig velocity was about 0.3 m/s (which is below the typical ILI expected speed but closer to it than the speed in the CPF-Sarayacu section) Sarayacu – Baeza (launched on 27 Jun 2014)


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