No one wants to make a crisis out of a drama but it is hard for offshore specialists not to panic about the price of oil.

This week, Brent crude hit $46 per barrel, which means it is down around 60% on where it was in June and at its lowest for six years.

Energy analysts at investment bank Goldman Sachs have slashed their first-quarter oil-price estimates by 50% — to $42 — but no one knows where the real floor will be.