At the end of viable production from subsea wells, an abandonment program may be required to render the well safe, remove the subsea infrastructure and return the seabed to its original condition.
The following operations and selected tools are typical of those encountered by an ROV team during this abandonment phase.
Vessel Campaign Pre-Rig Arrival
If the subsea well/field is old, then it is likely that detailed drawings and models will not be available. A seabed as built survey can be conducted using high resolution cameras, laser scanning and 3D acoustic imaging.
1. Conduct Video As Built Survey of the Field Using the Following TMT Tooling Options
High quality video surveying using the Surveyor-HD Pro
Capture high resolution digital stills images using the Tiger Shark Digital Stills Camera
Gather accurate point measurement data of subsea structures in clear water using the Subsea Laser Scanner
Gather accurate point measurement data of subsea structures in poor visibility using the Coda Echoscope 3D Sonar
2. High Pressure Cleaning of Subsea Trees and Manifolds
High pressure cleaning using the TMT 420 Water Blaster Tool