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 U ID (20 o C) = 0.9 W/m 2.K Gas Field High Temperature (120 C) Challenging Bathymetry Elevation [m] -102-104 0 1000 2000 3000 4000 5000 6000 7000-106 -108-110 -112-114 -116-118 -120-122 -124 Distance from Islay well [m]
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)
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
PROCEDURE ISLAY PIPELINE SHUTDOWN Depressurization 10 Days ETH-PIP Shut-Down Gas Prod. Test Cooldown Methanol Injection
DEPLOYMENT AND SUBSEA ARCHITECTURE ROV Panel TA 6 km PIP 6 /12 Umbilical SUTA
OFFSHORE DEPLOYMENT
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 2
TEMPERATURE PROFILE Temperature [ C] 35 30 25 20 15 10 5 Temperature evolution during warm-up phase Warm-up Sections selection 0.0 1.4 2.0 2.5 3.0 0-124 0 1000 2000 3000 4000 5000 6000 Length [m] -102-104 -106-108 -110-112 -114-116 -118-120 -122 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 characterization from temperature evolution 28 gas 0.8 1921 fluids water 998 4180 methanol 796 2480 liquid % ρ Cp methanol [kg/m3] [J/kg/K] A 55% 887 3245 B 75% 846 2905 C 95% 806 2565 Temperature [ C] 25 22 19 16 13 10 gas 1 gas 3 gas 2 Tfluid gas ( C) liquid 1 Tfluid liquid_a liquid 2 Tfluid liquid_b liquid 3 Tfluid liquid_c 7 0 5 10 15 20 25 30 Time [hr]
FLUIDS INVENTORY 15 Good estimation of the injected amount of methanol 10 5 Asymmetry of liquid pocket 0 Temperature [ C] 35 30 25 20 15 10 5 0 Warm-up -124 0 1000 2000 3000 4000 5000 6000 Length [m] Temperature [ C] 35 30 25 20-124 0 1000 2000 3000 4000 5000 6000 Length [m] -102-104 -106-108 -110-112 -114-116 -118-120 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 Warm-up - Gravitational effects -122 - Trapped gas pocket - Pressurized -102-104 -106-108 -110-112 -114-116 -118-120 -122 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.
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!!!
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