In August 2023, Oceaneering deployed its Advanced Subsea Visual Metrology (ASVM) suite to collect data related to wells and pipeline end manifolds (PLEMs) located in 1,500 ft water depth.
The scope was included as part of an annual inspection campaign used to confirm the condition of the assets.
The client historically completed the data collection activities using a light detection and ranging (LiDAR) method, but wanted to explore options for a faster, less equipment intensive solution to provide highly accurate and expedited results.
Subsea infrastructure is subject to movement after initial production due to thermal growth.
Infrastructure is designed to allow thermal growth, preventing overstressing of components such as jumpers and hub connectors.
The client conducted detailed movement analysis to ensure components were moving as expected and no excessive stress existed on the jumpers or hubs, which could lead to compromised sealing or complete failure. The client traditionally conducted these inspections using LiDAR but opted to compare the LiDAR results with photogrammetry.
The Oceaneering photogrammetry team leveraged extensive domain knowledge, pilot and survey team expertise, and high levels of preparation to execute the project scope.
Oceaneering completed the subsea inspection using the 4,000m-rated ASVM suite fitted onto a Millennium® ROV onboard its Brandon Bordelon vessel. The suitability of photogrammetry for subsea metrology was showcased by imaging passes of the seabed without the structure in view. Each pass was completed in less than 30 minutes, delivering a highly efficient solution for data capture. Two Oceaneering surveyors were present on the vessel and data was streamed via our secure infrastructure and the Oceaneering Media Vault (OMV) to an onshore based team who were able to provide additional support in real-time.
Using photogrammetry and the ASVM solution provided the client with high quality results swiftly. The Oceaneering dataset enabled advanced data analysis and quantitative measurements of the site.
The dynamic acquisition method enabled immediate feedback on visibility and coverage, thereby ensuring that there was nothing impeding data acquisition at the time of inspection.
The clients were provided with full, colorized models that enabled them not only to assess the assets’ positions compared to the historic data, but identify structural changes including marine growth or any areas of degeneration in the structure.
Oceaneering was also able to compare the conductor locations measured between the jumper inspection dataset and the dataset that only included the conductors and seabed. The result of fitting a best-fit circle to the conductors showed an impressive difference of only 4.6mm over the 65m distance measured between different surveys.
The success of the scope and the comprehensive report (images, video, 3D models, measurements) has demonstrated the suitability of the solution and will enable the client to complete year-by-year comparisons to verify the integrity and position of the jumpers. The comprehensive dataset will also enable accurate decision making should intervention be required.
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