Many oil companies had trimmed their budgets heading into 2015 to deal with lower oil prices. But the rebound in April and May to $60 per barrel from the mid-$40s suggested that the severe drop was merely temporary.
Crude oil prices were volatile after ministers from the Opec cartel decided to hold production levels at 30 million barrels per day. Brent crude traded in a narrow range around $62 a barrel, before ending the day up 1.8% at $63.15.
Global oil prices have fallen further after the International Energy Agency (IEA) reported higher output and cut its forecast for demand growth. Brent crude fell 2.72 to 86.17 dollars a barrel before seeing a slight recovery, while US crude dropped 1.75 to 83.99.