1 Project Overview
During an ROV inspection of a customer's assets offshore Brazil, an Oceaneering team observed that a damaged riser had been released from its clamp and moved freely in the water column.
A basic smartphone video was taken and sent onshore for viewing. From this video, a 3D model was created and sent to the customer. Subsequently, the client commissioned a more detailed ROV photogrammetry survey of the damaged riser area and a more accurate model was created. From this 3D model, an engineering mitigation plan for riser repair and subsequent re-clamping of the riser to the asset was performed.
3 Our Solution
Smartphone video confirmed the riser damage.
Oceaneering worked with the client to better define and understand the future needs to remedy the problem. A more detailed photogrammetry survey was required, and Oceaneering worked with the customer and offshore team to plan for a more accurate and detailed ROV photogrammetry survey of the riser and clamp area on the asset.
There were several options for assessing the damaged riser and confirming the size and location of potential asset issues. Photogrammetry was identified as a method that was likely to produce fast results because it can be completed with smartphone or ROV video and specialized software. This enabled the customer to repair the damaged riser in a timelier manner than waiting on equipment not yet in country to be mobilized for alternative advanced survey methods.
4 Execution Plan
An ROV photogrammetry survey plan was developed and included the installation of calibrated scale bars to the work site to improve the accuracy of the final 3D model deliverable that the client required.
A survey line plan on the asset was drawn up for the ROV to follow while recording standard ROV camera video. The ROV video was then modelled using proprietary Oceaneering photogrammetry workflows and procedures to produce a final 3D model deliverable.
Normally, video would be taken with the ROV to assess the damaged riser.
However, the customer had recently taken over operations at the asset and needed to know how far apart the risers were so the ROVs could get through the space between them. This was resolved by the smartphone video footage and initial 3D modelling. Once the sizing was determined, the ROV could be comfortably deployted to complete the photogrammetry survey.
Oceaneering provided a turnkey solution with existing services.
This enabled a rapid response and fast and seamless delivery of the data that allowed the client to make an informed decision on the repair of the riser. By using the photogrammetry services, the client was able to quickly address the problem and avoid further production issues.
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