Aasta Hansteen, Norway
In 2015 Subsea 7 selected NASNet® to provide field wide acoustic positioning throughout Statoil’s Aasta Hansteen field. The array was used by a range of construction and survey vessels, including installation of suction anchors and umbilicals. The array was installed for 12 months.
An array consisting of 17 NASNet® stations was installed along with various NASNet® MTrx QC references. ROV and vessel deployed VTrx systems provided ROV positioning and enabled system management functions to be performed.
All in field construction activities were completed using NASNet®. ROV positioning, which made use of the NASNet® VTrx system, with the dunking version being used as necessary from the vessels’ decks. To facilitate safe deployment of the dunker, Imenco Nautronix supplied a NASNet® deck deployment system (DDS).
Structure installation and position quality verifications were performed using NASNet® MTrx, providing position and telemetry data acoustically to the ROVs.
The NASNet® array at Aasta Hansteen provided acoustic positioning for over 200 vessel days spread across six different vessels over a two year period. Throughout the project Imenco supported offshore operations with the NASNet® project team and NASNet® trained services personnel.
