© Marc Roussel / Total
OFFSHORE THERMAL TESTING OF
AN ELECTRICALLY TRACE HEATED
PIPE-IN-PIPE
Julien Rolland, Sarah Boudour & Jeremy Cutler
MCE Deepwater Development, 24/03/2015
ISLAY FIELD DEVELOPMENT : DESCRIPTION
 Offshore Shetlands - South of Alwyn at the end of a complex pipeline







network
122m WD
6km single well tie-back
6” ID
UID(20oC) = 0.9 W/m2.K
Gas Field
High Temperature (120 °C)
Challenging Bathymetry
-102
-104 0
1000
2000
3000
4000
5000
6000
7000
-106
Elevation [m]
-108
-110
-112
-114
-116
-118
-120
-122
-124
Distance from Islay well [m]
MCE Deepwater Development, London, 2015
ISLAY ETH PIP DESIGN ARCHITECTURE
 Cable rated 2kV Designed for 30W/m
 300% (warm up) redundancy
 Two x fibre optic cables
 All electrical components have been qualified
 High thermal insulation & power efficiency (180 kW)
MCE Deepwater Development, London, 2015
FULL SCALE OFFSHORE TESTS
● Commissioning test, April 2012
- Few damages (connection system)
● Thermal test, September 2012
- Design performances confirmed
● Thermal test, June 2014
- Design performances confirmed
Flow assurance modelling using an electrical trace heated Pipe in Pipe: From qualification to offshore
testing
Decrin M-K., Nebell F., Naurois H., Parenteau T., 2013
Offshore Technology Conference, OTC 24060
Field deployment of the world’s first electrically trace heated Pipe in Pipe
Fisher R.C., Hall S., Cam J-F., Delaporte D., 2012
Offshore Technology Conference, OTC 23108
Evaluation qualification of electrically heat trace Pipe in Pipe for a SS flowline and selection for an
application on a subsea field in the UK, Islay
De Herve N., Delaporte D., Hellingoe M., Hughes G., 2011
Offshore Technology Conference, OTC 21396
MCE Deepwater Development, London, 2015
PROCEDURE – ISLAY PIPELINE SHUTDOWN
Depressurization
10 Days
Shut-Down
Gas Prod.
ETH-PIP
Test
Cooldown
Methanol
Injection
MCE Deepwater Development, London, 2015
DEPLOYMENT AND SUBSEA ARCHITECTURE
ROV
Panel
TA
6 km PIP 6’’/12’’
Umbilical
SUTA
MCE Deepwater Development, London, 2015
OFFSHORE DEPLOYMENT
MCE Deepwater Development, London, 2015
THERMAL TEST PROCEDURE
● RAMP-UP : The power in each cable is brought to its maximum power gradually
● WARM-UP : Continuous temperature increase inside the flowline using a constant high
power in each cables (about 15 Watt per cable and per meter of ETH-PIP)
● MAINTAIN : The flowline temperature is maintained by supplying a constant low power in
each cable.
● COOLDOWN : Temperature inside the flowline is reduced by stopping all power feed to the
ETH-PIP.
1
3
MCE Deepwater Development, London, 2015
2
TEMPERATURE PROFILE
● Temperature evolution
during warm-up phase
● Sections selection
Warm-up
35
-102
-104
30
-106
-108
Temperature [°C]
25
-110
20
-112
-114
15
-116
10
-118
-120
5
-122
0
0
1000
2000
MCE Deepwater Development, London, 2015
3000
Length [m]
4000
5000
-124
6000
0.0
1.4
2.0
2.5
3.0
3.5
4.0
4.6
5.1
5.7
6.3
6.8
7.3
8.4
9.5
10.6
liquid1
gas1
gas2
liquid2
gas3
liquid3
FLUIDS INVENTORY
fluids
liquid
● Fluids characterization from
A
B
C
temperature evolution
gas
water
methanol
%
methanol
55%
75%
95%
0.8
998
796
ρ
[kg/m3]
887
846
806
1921
4180
2480
Cp
[J/kg/K]
3245
2905
2565
28
25
gas 1
gas 3
Temperature [°C]
22
gas 2
Tfluid gas (°C)
19
liquid 1
Tfluid liquid_A
16
liquid 2
13
Tfluid liquid_B
liquid 3
10
Tfluid liquid_C
7
0
5
MCE Deepwater Development, London, 2015
10
15
Time [hr]
20
25
30
Warm-up
35
FLUIDS INVENTORY
-102
-104
30
-106
-108
Temperature [°C]
25
-110
20
-112
● Good estimation of the injected amount of methanol
● Asymmetry of liquid pocket
-114
15
-116
10
-118
-120
5
-122
0
0
Warm-up
35
-102
-104
30
-106
-108
Temperature [°C]
25
-110
20
-112
-114
15
-116
10
-118
-120
5
0
0
1000
2000
MCE Deepwater Development, London, 2015
3000
Length [m]
4000
5000
1000
2000
0.0
1.4
2.0
2.5
3.0
3.5
4.0
4.6
5.1
5.7
6.3
6.8
7.3
7.9
8.4
9.0
9.5
10.0
10.6
liquid1
gas1
gas2
liquid2
gas3
liquid3
3000
Length [m]
4000
- Gravitational effects
-122
- Trapped gas pocket
-124
6000
- Pressurized
5000
-124
6000
0.0
1.4
2.0
2.5
3.0
3.5
4.0
4.6
5.1
5.7
6.3
6.8
7.3
7.9
8.4
9.0
9.5
10.0
10.6
liquid1
gas1
gas2
liquid2
gas3
liquid3
CONCLUSION (TESTS)
● Challenging tests but successful!!!
- Part of Alwyn Area Summer Shutdown offshore campaigns
● Equipment running well
- Harsh connection
- Partial loss of redundancy
● Flow assurance monitoring
- Insulation performances
- Liquid hold-up
● The tests have shown that the Islay Electrical Trace
Heating is a robust system that has maintained its
thermal performance over time and is now ready to be
deployed elsewhere in the Total Group.
MCE Deepwater Development, London, 2015
CONCLUSIONS (TECHNOLOGY)
● ETH PIP as a power-efficient alternative to DEH
● High qualification level allowing to consider this
technology for new development
● Good involvement of Technip & Subsea 7
● Correct level of competition between two or more
contractors
● Recommended technology to other operators!!!
MCE Deepwater Development, London, 2015
MCE Deepwater Development, London, 2015
DISCLAIMER and COPYRIGHT RESERVATION
The TOTAL GROUP is defined as TOTAL S.A. and its affiliates and shall include the
person and the entity making the presentation.
Disclaimer
This presentation may include forward-looking statements within the meaning of the
Private Securities Litigation Reform Act of 1995 with respect to the financial condition,
results of operations, business, strategy and plans of TOTAL GROUP that are subject
to risk factors and uncertainties caused by changes in, without limitation, technological
development and innovation, supply sources, legal framework, market conditions,
political or economic events.
TOTAL GROUP does not assume any obligation to update publicly any forwardlooking statement, whether as a result of new information, future events or otherwise.
Further information on factors which could affect the company’s financial results is
provided in documents filed by TOTAL GROUP with the French Autorité des Marchés
Financiers and the US Securities and Exchange Commission.
Accordingly, no reliance may be placed on the accuracy or correctness of any such
statements.
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All rights are reserved and all material in this presentation may not be reproduced
without the express written permission of the TOTAL GROUP.
MCE Deepwater Development, London, 2015