"Outside of a few better-positioned companies, demonstrating free cash flow will be challenging at current oil prices," Hanold said.
The Saudis have signaled they will throttle back on production in December. But unless OPEC and Russia can reach a new deal to constrain output in Vienna next month, analysts see the prospect of sustained oversupply in 2019, undoing the group's success over the last two years to drain global inventories.
Trump, Russian President Vladimir Putin and Saudi Crown Prince Mohammed bin Salman will attend next week's G20 meeting in Buenos Aires. The Russian and Saudi energy ministers are also scheduled to travel to Argentina's capital, according to people familiar with their plans.
Crude collapsed into a bear market this month after the US allowed some nations to continue buying Iranian supply. Trade tension between America and China is raising concerns over demand and Trump renewed a call for lower oil prices. Those factors pushed up oil's volatility this week to the highest since early 2016.
"We continue to see fundamentals improving in the near-term, but caution traders against sticking their necks out until the momentum shock finds a more solid floor," TD Securities analysts led by Bart Melek wrote in a note to clients.
Oil briefly eased off on some of its losses after the Wall Street Journal reported the Saudis and the rest of OPEC were negotiating a compromise that would cut output while still placating Trump.
Nonetheless, Brent for January settlement fell 6.1 per cent to US$58.80 a barrel at the close of trading on London's ICE Futures Europe exchange. The global benchmark traded at a US$8.38 premium to WTI.
West Texas Intermediate for January delivery lost 7.7 per cent from Wednesday's close to reach US$50.42 a barrel on the New York Mercantile Exchange. There was no settlement Thursday due to the US Thanksgiving holiday.