The price of US oil has dropped to a level not seen since 1999, as demand dries up and storage runs out.
The price of a barrel of West Texas Intermediate (WTI), the benchmark for US oil, dropped 14% to $15.65 in Asia trading on April 20.
The oil market has come under intense pressure during the coronavirus pandemic with a huge slump in demand.
US storage facilities are now struggling to cope with the glut of oil, weakening prices further.
The oil industry has been struggling with both tumbling demand and in-fighting among producers about reducing output.
Earlier this month, OPEC members and its allies finally agreed a record deal to slash global output by about 10%. The deal was the largest cut in oil production ever to have been agreed.
However, analysts said the cuts were not big enough to make a difference.
Meanwhile, concern continues to mount that storage facilities in the US will run out of capacity, with stockpiles at Cushing, the main delivery point in the US for oil, rising almost 50% since the start of March, according to ANZ Bank.
“We hold some hope for a recovery later this year,” the bank said in its research note.
The drop was also driven by a technicality of the global oil market. Oil is traded on its future price and May futures contracts are due to expire on April 21. Traders will be keen to offload those holdings to avoid having to take delivery of the oil and incurring storage costs.
Brent oil, the benchmark used by Europe and the rest of the world, was slightly weaker, down 0.8% to $27.87 a barrel.