Subsea laser LiDAR technology provider 3D at Depth has successfully demonstrated the potential of survey grade measurements from hovering resident systems, with an emphasis on using subsea LiDAR technology.
The technology showcase, which was conducted in October in partnership with the Norwegian Forum for Offshore Survey and Positioning (NOSP) and OneSubsea, was developed to engage subsea energy experts to pose the question: ‘At what stage does the survey community need to be involved with field layout planning to ensure survey quality measurements are reliable from a resident system?’
The demonstration provided multi-use case studies focused on inspection, maintenance and repair applications, and considered whether subsea LiDAR’s unique controllable beam patterns were able to maintain measurement accuracies when scanning from static and hovering platforms.
The company’s subsea LiDAR laser scans consistently generated survey grade measurements, detected leaks and provided a unique benefit of infield navigation from the same sensing package. Each survey scan mode produced reliable results from a hovering inspection platform while being able to repeat very high-resolution slow scans, in addition to lower resolution fast scans.
X, Y, Z differences between the static and hovering platform scans ranged between 1mm and 3mm. Each scan mode was completely configurable for resolution to the targets. Scan modes took 3 minutes or 5 seconds per sector, respectively.
The demonstration effectively showed that from controlled survey markers, or targets, placed around the survey location, 3D at Depth’s subsea LiDAR controlled beam repeatedly acquired survey grade measurements in single sector scans while hovering.
Moreover, during the data acquisition, a small simulated gas leak was detected, supporting the company’s subsea LiDAR capability already observed in multiple open water surveys of subsea assets.
“Resident solutions that provide reliable survey grade measurements while capturing additional integrity measurements are the future for offshore field management,” said Neil Manning, COO of 3D at Depth. “Subsea LiDAR’s key differentiator is the ability to simultaneously provide accurate digital twin point clouds along with other data integrity information.
“These technical demonstrations show it’s possible to reliably acquire survey grade quality data by combining 3D at Depth Subsea LiDAR with a resident or remote sensing system when it is available. Solutions like these can potentially help oil and gas operators reduce costs, lower risk, and possibly decrease the loss of production period downtimes."
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