On 07 December 2016, DOF Subsea, a leading provider of integrated subsea services, together with subsea technology companies Sonardyne, 2G Robotics, and Seatronics (an Acteon company), demonstrated a new, industry-leading, underwater surveying technique that will have a significant impact on the time needed to map underwater structures and offshore sites.
Representatives from across the energy sector attended demonstrations held at The Underwater Centre in Fort William to showcase the capabilities of Dynamic Mobile Mapping. This new solution brings together three independent systems, 2G Robotics ULS 500 Pro Laser (exclusively available from Seatronics), Sonardyne's SPRINT acoustically-aided inertial navigation sensor, and DOF Subsea's exclusive Metro software, each proven in its respective field. The solution is ROV-mounted and mapping operations are conducted while the vehicle is in motion in order to simultaneously survey multiple horizontal or vertical flanges.
When asked about the demonstration, Pieter Jansen, Geomatics Global, said “The combined system components brought together and showcased in Fort William were proof of further advancements within the survey industry, combining technological advancements with operational efficiencies. A much welcome and needed approach in an economically hard hit Oil and Gas Industry.”
Underwater metrology requires accurate, precise and robust measurements. By combining the 3D laser data with precise underwater acoustic and inertial navigation information, the solution generates high-resolution engineering models from which accurate measurements can be instantaneously and repeatedly captured. This is critical for successful fabrication and installation of spools and jumpers, and brings enormous cost and time saving benefits.
Colin Cameron, DOF Subsea said, “At DOF Subsea, we pride ourselves on working in partnership with industry leaders to develop new technological solutions to subsea challenges. The development of this solution is hugely important for the energy sector, and we were delighted with the data that we were able to gather in Fort William. We have proven that the technologies work together in this application and that the method can generate the quality and complexity of data required. We believe that using this combination of technology to provide a full metrology solution is an industry first - we can save days on traditional metrology work, and provide much higher quality data. This in turn brings savings to the operations teams running the projects.” This technology has a number of key operational benefits;
- Non-Intrusive - no prior subsea intervention is required in advance of metrology, and no subsea bracketry, control spheres or metrology aids are required
- Flexible Deployment - modular system which can be easily fitted to an ROV (for Dynamic data acquisition), or mounted onto a tripod (for static data acquisition)
- Time to Survey - significant reduction in the time (and therefore vessel cost) needed to gather the survey data in comparison to traditional techniques such as pure acoustic LBL; typically less than three hours for a laser metrology.
- Time to Data - quick delivery of results offshore; typically within six hours of data acquisition
- Inferred Metrology - with prior dimensional control information, hub position and orientation can be inferred using laser scan data
- More than Metrology, the 3D model used for metrology serves as an As-Built model of the subsea installation and the surrounding area to provide a baseline for future intervention work
Visit source siteDOF Subsea2G RoboticsSonardyneLaser MetrologyMetroSeabed MappingSeatronicsSurveySurvey and PositioningPoint CloudLaserROVUnderwater CentreColin CameronPieter JansenFort William