KEY POINTS
  • U.S. shale producer Whiting Petroleum filed for bankruptcy.
  • "The oil patch is falling apart," CNBC's Jim Cramer said.
  • West Texas Intermediate crude is trading around $20.36 per barrel, after losing more than half its value in the month of March.

Whiting Petroleum filed for bankruptcy protection on Wednesday, the first U.S. shale producer to do so as crude prices fall while major oil producers engage in a price war.

Analysts have warned that falling oil prices will lead to a wave of consolidation or bankruptcies in the U.S. energy sector