The Kingdom of Saudi Arabia is often cited as the world's largest oil producer. The country produces 13.24% of the oil consumed in the entire world daily. Saudi Arabia has the second-largest reserves of naturally occurring oil in the world after Venezuela. It is estimated that Saudi Arabia's oil resources amount to 260 billion barrels of oil. What country is the largest producer of crude oil? Crude oil production is defined as the quantities of oil extracted from the ground after the removal of inert matter or impurities. Crude oil is a mineral oil consisting of a mixture of hydrocarbons of natural origin, yellow to black in color, and of variable density and viscosity. Top ten countries by oil production. USA – 12,000,000bbl/day. The US is the world leader in oil production , producing approximately 12 million barrels of oil per day (mbbl/day Russia – 11,200,000bbl/day. Saudi Arabia – 11,113,710bbl/day. Iraq – 4,451,516bbl/day. Iran – 3,990,956bbl/day.