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, where 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.
The riser had become damaged and was no longer secured to the asset.
With this being an older asset, there was serious risk to continued productivity. Also, with the riser covered in marine growth, it would be difficult to assess the exact level of damage sustained.
A basic 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 sizing and location of potential asset issues. Photogrammetry was identified as the method that was likely to produce fast results because it can be done with smartphone or ROV video and specialized software. This would enable the customer to repair the damaged riser in a timelier manner than waiting on equipment not yet in country to be mobilized for more advanced survey methods.
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 complete the photogrammetry survey.
This project highlights the One Oceaneering integrated service offering.
Multiple business segments came together to help the client identify and repair the damaged riser. Oceaneering's ROV team observed the loose riser and through subsequent surveys, and our Survey group was able to provide our internal photogrammetry service combined with our offshore design center’s 3D modelling capability. Our Offshore Projects group then devised the engineering mitigation strategy for the securing and repair of the riser with a new clamping solution.
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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