Insufficient supply of crude oil; Oil tax is too high; In addition to the epidemic and geopolitical crisis, global money supply, economic recovery, energy demand growth and measures to limit production in OPEC member countries have all caused oil prices to rise rapidly. In addition, the situation in the Middle East has been turbulent for a long time: a large number of oil fields have been forced to cut production or stop production, and the shortage of crude oil supply directly leads to the fluctuation of international crude oil prices.