The sharp slides in oil prices seen since the summer could continue unabated until the commodity's chief trade body OPEC (Organization of the Petroleum Exporting Countries) is finally forced to take action, investors have said.
Brent crude oil has fallen to more than a two-year low following a thinktank's move to cut its forecast for global oil demand, while markets were muted overnight ahead of a pivotal US Federal Reserve meeting.
Shares in BP slumped late on Thursday after the group was found by a US judge to be "grossly negligent" and "reckless" in the Gulf of Mexico four years ago.
Global markets have jumped and oil has hit a 14-month low as geopolitical tensions between Russia and Ukraine show signs of abating.
Fund managers have a "critical" imperative to warn clients about the risks of chasing yield despite low volatility, former monetary policymakers have warned.
James Harries is increasing exposure to oil and gas stocks in his Newton Global Higher Income fund, having compared the investment opportunities in the sector to those in the mining industry a few years ago.
The price of Brent crude oil has fallen as much as $3 per barrel, following a deal between Iran and other major world powers on nuclear activities.