The global oil market is so different today as compared to what it was three years ago that it’s borderline unrecognizable. These changes are being hammered out in a battle between petrostate producers on the one side pushing for a rebalancing of supply and demand by cutting their own output, and a group of upstarts on the other, led by U.S. shale companies, that want to fight to bring the costs of production down permanently from their previously high ($100+ per barrel) levels.
https://www.the-american-interest.com/2017/05/17/the-new-oil-reality/