detection of leaks in offshore pipelines - mts: mts home subsea leak... · • focus on distributed...
Post on 04-Jul-2018
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Joint Industry Program• Program commenced in early 2013• Focus on distributed sensors for offshore leak detection
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Project Drivers• Offshore leak detection needs:
• High reliability and sensitivity for small leaks• Continuous detection capability (time and space)• Ability to locate leaks• Performance over wide range of pipeline conditions
• Two candidate technologies identified:• Distributed temperature sensing (DTS)• Distributed acoustic sensing (DAS)
• Commercial technologies exist• Lack of available data for offshore applications
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Project Overview• Overall scope
• Study the leak behavior (thermal, acoustic) for various leaks• Perform testing of fiber-based systems
• Underlying motivation• Understand main drivers of leak propagation (e.g. fluid properties,
location, etc.)• Evaluate ability of systems to detect leaks (specific applications
may require further work)
• Overall objective• Determine, in controlled environment, if DTS and DAS can detect
small (<0.25”) leaks
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Project Progression
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Engage operators as to establish range of each parameter
Characterize acoustic and thermal profiles
Design and fabricate test bed(s)
Conduct large-scale testing of systems
Baseline Conditions• Line size: 0.51-0.76 m (20-30 in)• Water depth: 300 m (984 ft)• Internal pipeline pressure: 3.45-13.79 MPa (500-2,000
psi)• Oil: 20-30 °API• Minimum gas temperature: 278 K (40°F)• Minimum oil temperature: 305 K (90°F)• Nominal water temperature: 277 K (39°F)• Simulated leak size: ≤ 6.35 mm (0.25 in) diameter
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Characterization Work• Topics:
• Jet-to-plume transition lengths• Water entrainment• Temperature profiles• Plume migration (near-field)• Near-field acoustics
• Approaches:• Analytical modeling• Numerical modeling• Small-scale testing
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Large-Scale Testing• Seven technology
providers• Three DAS• Four DTS
• Separate test beds for water and soil
• Test objective was event detection
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Leak Location/Size Summary• 20”-diameter pipe• 14 different leak ports
• Size ranging from 1/32” to 3/16”• Some directly under cable, most
offset from cable• Three radial positions
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Project Status• Most testing is complete• Results from testing show promise in systems being
applicable to offshore pipelines• Large-scale testing results planned for publishing in 2015
• Looking towards expansion to future topics• Open to new operators joining the JIP• May tackle future projects as one-time activities as opposed to
continuation of single program
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Future Topics of Interest• Non-orifice leak geometries• Multiphase flow• Inflow• Cable installation
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