oil and gas exploration and monitoring
Edaphic Scientific specialises in providing sensors for underwater exploration and monitoring for the oil and gas industry. We supply the Franatech range of sensors designed to monitor dissolved gases to depths of 4000m in either fresh or sea water. Our equipment measures gases such as methane, carbon dioxide, hydrogen and hydrogen sulfide, and can be easily connected to CTD’s such as Sea-Bird as well as ocean sniffers, AUVs, and fixed moorings.
- Dissolved Methane Sensors
- Dissolved Carbon Dioxide
- Hydrogen Sulfide (H2S) Sensors and Meters
- pH Sensors
a case study
gas monitoring and leak detection in underwater application for the offshore oil and gas
point gas sensors as part of a multi-technology leak detection system
- “Selection And Use Of Subsea Leak Detection Systems” Det Norske Veritas Recommended Practice, DNV-RPF302 (April 2010)
- It is not anticipated that a single technology/principle would be able to detect all of the possible leaks in all possible environments
- Combining two or more types of sensors may provide more confidence in the overall leakage detection system
- Complementary sensor technologies should be selected to compensate for the respective weaknesses and enable indication of a leak event from one sensor type to be confirmed by positive indications from the other sensor type
- Point sensors may be installed over critical leak points
Advantages of point gas sensors
- Data aggregation from different technologies is necessary to reduce uncertainty in particular rate and risk of false alarms
- Gas sensors can be used also for oil detection, as crude live oil has a high content in dissolved gas
- Gas plumes spreads out much faster than oil, and can therefore be used as early indicator
- Gas sensors can be positioned according to prior leak propagation simulation based on model e.g. “DeepBlow – a Lagrangian Plume Model for Deep Water Blowouts” Spill Science & Technology Bulletin, 6(2), April 2000, pp103-111, Øistein Johansen, SINTEF , Trondheim, Norway
A total of 11 Franatech METS Methane Sensors have been deployed as part of an under water leakage detection network in the North-Sea for a long-term monitoring purpose.
The concept design and development of the under water leakage system is lead by the Norwegian Geotechnical Institute and Company Stinger Technology AS.
The network is installed around a platform operated by a major international oil company. The picture above shows some of the network nodes (without seabed frames) prior to offshore installation.