Reduced cost subsea condition monitoring using ‘Send and Forget’ acoustic communication
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Reduced cost subsea condition monitoring using ‘Send and Forget’ acoustic communication

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Presentation given at the Subsea Survey IRM conference 2011 in Houston, describing applications of Aquatec's AQUAmodem 500 'send and forget' underwater communication system.

Presentation given at the Subsea Survey IRM conference 2011 in Houston, describing applications of Aquatec's AQUAmodem 500 'send and forget' underwater communication system.

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Reduced cost subsea condition monitoring using ‘Send and Forget’ acoustic communication Presentation Transcript

  • 1. Reduced cost subsea condition monitoring using ‘Send and Forget’ acoustic communication Andy Smerdon CEO Aquatec Group, UK Wednesday Session Track 1 14 December 2011
  • 2. Slide 1 Overview• Introduction to Aquatec Group• Acoustic telemetry – pros and cons – ‘Send and forget’ concept• AQUAmodem 500 system• Case studies• Summary Subsea Survey IRM, Houston14 December 2011 Send & Forget Telemetry
  • 3. Slide 2 Overview• Introduction to Aquatec Group• Acoustic telemetry – pros and cons – ‘Send and forget’ concept• AQUAmodem 500 system• Case studies• Summary Subsea Survey IRM, Houston14 December 2011 Send & Forget Telemetry
  • 4. Slide 3 Aquatec Group Ltd• Founded in 1990 by Andy Smerdon• Based in UK, 40 miles SW of London• Primary expertise: • Subsea instrumentation • Underwater acoustics • Low power autonomous systems• Design and manufacture all products and engineered solutions• Products sold worldwide Subsea Survey IRM, Houston14 December 2011 Send & Forget Telemetry
  • 5. Slide 4 Aquatec Group Ltd Customers in the offshore market Subsea Survey IRM, Houston14 December 2011 Send & Forget Telemetry
  • 6. Slide 5 Overview• Introduction to Aquatec Group• Acoustic telemetry – pros and cons – ‘Send and forget’ concept• AQUAmodem 500 system• Case studies• Summary Subsea Survey IRM, Houston14 December 2011 Send & Forget Telemetry
  • 7. Slide 6 Acoustic Telemetry: Pros & Cons Pros Cons Long range potential  Slow  Cheaper than long  Needs power: even cable runs more for 2-way  Cheaper to install  Busy communication than cable channel Can be more robust  Acoustic path can be than cable problematic Subsea Survey IRM, Houston14 December 2011 Send & Forget Telemetry
  • 8. Slide 7 ‘Send and Forget’ concept• System Analogies 1. Static meter display - check when passing or on a schedule 2. Heartbeat monitor - periodic tick shows system is healthy - alarm and increased data when faulty• Measure data at preset rate• Transmit data infrequently if all is well• Increase update rate when alarm conditions are met• Transmission is automatic – no interrogation needed from the surface• Only powered up when reading data or transmitting Subsea Survey IRM, Houston14 December 2011 Send & Forget Telemetry
  • 9. Slide 8 Overview• Introduction to Aquatec Group• Acoustic telemetry – pros and cons – ‘Send and forget’ concept• AQUAmodem 500 system• Case studies• Summary Subsea Survey IRM, Houston14 December 2011 Send & Forget Telemetry
  • 10. Slide 9 1st AQUAmodem 500 System• Manufacturer of marine hoses for offloading – Double carcass – Outer carcass unstressed – Has same rating as inner hose to contain leak• Needed warning system – Need to know leak has occurred – Diver operated tap on one-way valve Subsea Survey IRM, Houston14 December 2011 Send & Forget Telemetry
  • 11. Concept Development• 1990’s Aquatec underwater comms: Cathodic protection monitoring with acoustic-linked data acquisition units  Data rates up to 1kbps  Long deployment time  High power requirement  Large housings  Expensive to build Subsea Survey IRM, Houston14 December 2011Slide 10 Send & Forget Telemetry
  • 12. Slide 11 Concept Development• Previous Aquatec acoustic products: AQUAmark marine mammal deterrent  Very low power  Long deployment time  Semi-random transmission  Low cost14 December 2011 Subsea Survey IRM, Houston Send & Forget Telemetry
  • 13. Concept Development• Previous Aquatec data acquisition products: AQUAlogger 520 pressure/temperature data loggers  Very low power  Long deployment time  Precision measurement  Low cost Subsea Survey IRM, Houston14 December 2011Slide 12 Send & Forget Telemetry
  • 14. Concept Development• Combined the AQUAlogger & AQUAmark to produce the AQUAmodem 500P  Low power telemetry  Low power pressure measurement  Long deployment time  Small size  Semi-random transmissions Subsea Survey IRM, Houston14 December 2011Slide 13 Send & Forget Telemetry
  • 15. Slide 14 Mode of Use• Pressure telemetry system – Replace tap with subsea pressure telemetry unit – Integral pressure transducer – Measures pressure and transmits as acoustic signal – Signal received and decoded at surface Subsea Survey IRM, Houston14 December 2011 Send & Forget Telemetry
  • 16. Slide 15 Mode of Use Subsea Survey IRM, Houston14 December 2011 Send & Forget Telemetry
  • 17. Slide 16AQUAmodem 500P Acoustics• ‘Send and forget’ principle• Read every 5 minutes• Transmit every 30 minutes unless alarm condition is detected• Transmit every 5 minutes if alarm is detected• Message collision avoidance: – Two transmissions every update period – Separated by random interval• Message includes error checking and correction• Decoding includes multiple validation stages to minimise false alarms• Range up to 400 m Subsea Survey IRM, Houston14 December 2011 Send & Forget Telemetry
  • 18. Slide 17 Subsea Schematic Subsea Survey IRM, Houston14 December 2011 Send & Forget Telemetry
  • 19. Slide 18Surface & Software Schematic Subsea Survey IRM, Houston14 December 2011 Send & Forget Telemetry
  • 20. Slide 19 Overview• Introduction to Aquatec Group• Acoustic telemetry – pros and cons – ‘Send and forget’ concept• AQUAmodem 500 system• Case study 1• Summary Subsea Survey IRM, Houston14 December 2011 Send & Forget Telemetry
  • 21. Slide 20 Case Study 1: Karan Temperature• Karan jacket – Gas production platform – Offshore Saudi Arabia – Seabed (pipeline) temperature used in pipeline gas leak detection system calculations – Avoidance of cable use provided simpler and less expensive solution for customer• Specification – Monitor temperature at bed (-50m LAT) to ±0.1°C – Transfer to DCS as 4-20 mA signal Subsea Survey IRM, Houston14 December 2011 Send & Forget Telemetry
  • 22. Slide 21 Case Study 1: Seabed Temperature• Karan gas platform• Offshore Saudi Arabia• Sea bed temperature monitoring required for pipeline gas leak detection system Subsea Survey IRM, Houston14 December 2011 Send & Forget Telemetry
  • 23. Slide 22 Case Study 1: Seabed Temperature• Temperature measurement of water near mud line• Transmission of data to surface for relay to platform computer system Subsea Survey IRM, Houston14 December 2011 Send & Forget Telemetry
  • 24. Slide 23 Case Study 1: Seabed Temperature• Measurement is transmitted from acquisition system clamped to 24” member every 10 minutes.• Receiver is mounted on flanged I-tube then cabled to DCS as 4-20 mA signal Subsea Survey IRM, Houston14 December 2011 Send & Forget Telemetry
  • 25. Slide 24 Overview• Introduction to Aquatec Group• Acoustic telemetry – pros and cons – ‘Send and forget’ concept• AQUAmodem 500 system• Case study 2• Summary Subsea Survey IRM, Houston14 December 2011 Send & Forget Telemetry
  • 26. Slide 25 Case Study 2: Pipeline Temperature• Asian subsea installation – Retrofit heated pipe in pipe – 50 to 60m water Subsea Survey IRM, Houston14 December 2011 Send & Forget Telemetry
  • 27. Slide 26 Case Study 2: Pipeline Temperature• Semi-remote temperature feedback required to – Maintain flow assurance – Calibrate field production operations• 8” and 4” pipes to be monitored Subsea Survey IRM, Houston14 December 2011 Send & Forget Telemetry
  • 28. Slide 27 Case Study 2: Pipeline Temperature 4” temperature monitor & surface receiver Subsea Survey IRM, Houston14 December 2011 Send & Forget Telemetry
  • 29. Slide 28 Case Study 2: Pipeline Temperature• Temperature sensor in base of instrument• Insulation layer to allow pipe temperature to be measured• Custom saddle for each pipe• Saddle strapped on to pipe• Transmits every 5 mins Subsea Survey IRM, Houston14 December 2011 Send & Forget Telemetry
  • 30. Slide 29 Subsea Survey IRM, Houston14 December 2011 Send & Forget Telemetry
  • 31. Slide 30 Subsea Survey IRM, Houston14 December 2011 Send & Forget Telemetry
  • 32. Slide 3114 December 2011 Subsea Survey IRM, Houston Send & Forget Telemetry
  • 33. Slide 32 Overview• Introduction to Aquatec Group• Acoustic telemetry – pros and cons – ‘Send and forget’ concept• AQUAmodem 500 system• Case study 3• Summary Subsea Survey IRM, Houston14 December 2011 Send & Forget Telemetry
  • 34. Slide 33 Case Study 3: CP Monitoring• UK North Sea platform• 25 years old• New impressed current cathodic protection system installed• Require near real-time cathodic protection potentials for closed loop control Subsea Survey IRM, Houston14 December 2011 Send & Forget Telemetry
  • 35. Slide 34 Case Study 3: CP Monitoring Cathodic CP1 Protection PSU & CP2 Control Software CP3 CP4 Hydrophone CP5 CP6 CP7 Anode Sleds CP8 CP9 Subsea Survey IRM, Houston14 December 2011 Send & Forget Telemetry
  • 36. Slide 35 Case Study 3: CP Monitoring• 9 AQUAmodem 500CP modules• Steel case in contact with jacket through clamp arrangement• Monitor jacket potential with respect to Zinc electrode & Silver/Silver Chloride cell• Transmit data every 15 mins Subsea Survey IRM, Houston14 December 2011 Send & Forget Telemetry
  • 37. Slide 36 Other Applications• Leak detection• Hydrotest monitoring• Level or attitude sensors• Intelligent pig pingers• … Subsea Survey IRM, Houston14 December 2011 Send & Forget Telemetry
  • 38. Slide 37 Overview• Introduction to Aquatec Group• Acoustic telemetry – pros and cons – ‘Send and forget’ concept• AQUAmodem 500 system• Case studies• Summary Subsea Survey IRM, Houston14 December 2011 Send & Forget Telemetry
  • 39. Slide 38 Present Limitations• Range versus Power – Smallest instruments 400m – Maximum range 3-4 km with appropriate power• Acoustic Path – Cannot bend the laws of physics, or acoustic rays• Data – Typically 1 or 2 values measured and transmitted• Number of Units – 64 maximum• Update Rate – Aim for not more than one unit per 20s Subsea Survey IRM, Houston14 December 2011 Send & Forget Telemetry
  • 40. Slide 39 Summary• Measurement and transmission integrated into one unit• Low power, long life• Multi-point data acquisition• Removes need for unreliable or costly cabling• Cheaper and more efficient than general purpose acoustic modems Subsea Survey IRM, Houston14 December 2011 Send & Forget Telemetry
  • 41. Slide 40 Manufacturers of: Hydrotest Instrumentation - Temperature and Pressure Data Loggers Leak Detection Systems – Vibration Monitoring Instruments Cathodic Protection and Monitoring Systems Acoustic and Optical Suspended Sediment Profilers and Instruments Underwater Acoustic Data Telemetry Thank you. Any questions? Andy Smerdon: asmerdon@aquatecgroup.com www.aquatecgroup.com14 December 2011 Subsea Survey IRM, Houston Send & Forget Telemetry