BP is working on an assumption oil prices will average $50 to $55 a barrel next year as global inventories gradually return to normal levels.

BP’s profit nearly tripled in the first quarter of 2017 from a year earlier, buoyed by rising oil prices and production that hit a five-year high, while debt piled up in order to pay for acquisitions and costs for the 2010 Gulf of Mexico spill.

For Europe’s biggest oil companies, $60 is the magic number. BP, one of the first companies to predict a prolonged price downturn, has “reset” its business to generate surplus cash flow, with oil at about $60 a barrel by 2017.