Intervention AUV
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Intervention AUV or I-AUV is a type of Autonomous Underwater Vehicle. Its characteristic feature is that it is capable of autonomous interventions on the subsea installations, a task usually carried out by ROVs or human divers.
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[edit] Before I-AUVs
Basic maintenance as well as repairs were traditionally done by human divers equipped with the appropriate pressure-resistant suits. Such operations were burdened with a high dependency on weather and involved direct hazards on humans. Due to slow exhaustion of the shallow oil sources, the oil wells were installed in deeper water (>500m of depth). This made diver operation less feasible due to heavy suits and higher associated risks. Beginning in the 80's, those duties were gradually taken over by ROVs which were reaching a status of a proven tool.
Both methods of intervention require mobilization of surface support vessel which is necessary either to supply and retrieve the divers or to deploy and control the ROV at work. The costs of maintaining such vessels or hiring them to complete an intervention are high (in the order of hundreds of USD for a day of operation) and contribute significantly towards the operational expenses connected to running the field.
[edit] Beginnings of the concept
After AUVs reached the stage of development allowing commercial application, hydrographic, fishing and oil exploration bussinesses quickly adapted them for several tasks like bottom mapping or water column measurements. Most of the application, however, involved survey AUVs for data collection.
Progress in computational power and techniques, development of underwater navigation systems (like Ultra-short baseline or Sonar), acoustic modems and cameras made it possible to build vehicles which could be controlled precisely enough to execute a precise mission on subsea installation. Such mission might include manipulating valves or connections on a panel of a oilfield Christmas tree. Further research will probably extend the list of possible operations of I-AUVs.
[edit] Examples
- 1996 OTTER I-AUV by the Stanford Aerospace Robotics Lab
- 2003 ALIVe AUV by Cybernetix
[edit] See also
- ROV
- Well Intervention
