Oil Rig Pipeline

I think it would be an interesting concept to make a permanent pipeline from an excisting oil rig to your island. It would take time ofcourse, maybe even need to upgrade the boat in a certain, but could be an interesting mechanic in the end.
When the oil rig is dry it could maybe even be converted to a hydrogen plant and use the excisting pipeline for hydrogen transport. This option is for example currently being looked at in the Netherlands in an attempt to make a large scale hydrogen production chain.

This is actually common if the rig is close to shore. Perhaps the game could take it into account with different tech levels for distance from island/size of pipe available.