Applies to: Decommissioning & integrity →
⚠ Illustrative viewpoint, written to demonstrate the resource hub.
A large wave of North Sea decommissioning is approaching. It is easy to think of asset marking as irrelevant at end of life. In practice, it is one of the small things that makes an expensive job faster or slower.
Decommissioning is a concurrent, tightly-planned programme across subsurface, subsea and topsides. Structures are cut and recovered, and the seabed is surveyed afterwards to identify and recover remaining debris, which is a regulatory requirement in most jurisdictions. Every one of those steps is easier when the assets are clearly identified, and slower when they are not.
Where marking touches the cost
- Survey time. A pre-decommissioning survey that can read every asset first time is faster than one that has to work out what it is looking at.
- Planning confidence. Clear identification reduces the risk of surprises in the removal sequence.
- Debris clearance. Recovering the right items depends on knowing what they are.
The problem is that on ageing fields, the original marking has usually fouled over or fallen off, right when it is needed most.
The practical read
The fix is not to have specified better marking twenty years ago. It is to re-mark in place now, using retrofit fixings that a diver or ROV can apply without recovering the asset. Do it as part of an integrity campaign and the same markers serve inspection today and decommissioning later. Marking is a rounding error against a decommissioning budget, and it buys back survey and planning time that is not.