U.S. weekly crude oil inventories unexpectedly substantial increase in the world's largest oil producer Saudi Arabia to consider increasing oil output, international oil prices on the 19th for the third consecutive day decline in New York and London, oil prices fell more than 3%. 

The same day, the U.S. Energy Information Administration released data show that, the week ended September 14, due to growth in both imports and domestic oil production, U.S. crude oil inventories surged 8.5 million barrels, an increase far exceeded market expectations. At this point, U.S. stocks totaled 3.677 billion barrels at historically high levels, the weight of the crude oil market. 

In addition, the same day reported that Saudi Arabia is considering to increase its oil output, in order to suppress the rise in oil prices. Currently, the Saudi oil output has reached about 10 million barrels per day. The market analysts pointed out that, if Saudi Arabia is to further increase production, the market will cause enormous pressure. 

In addition to the supply pressure, oil the day down there for technical reasons. The Fed announced on the 13th after the third round of quantitative easing monetary policy, oil prices rose to a four-month high, many investors choose to sell at a high level, exacerbating the drop in oil prices. 

But the day there are also factors pushing up oil prices. Bank of Japan to join the ranks of the Federal Reserve and the European Central Bank to announce a new bond-buying program, trying to use the quantitative easing monetary policy to stimulate economic growth. Middle East tensions still pose a threat to the region's oil production. 

To close the day, the New York Mercantile Exchange, light sweet crude for October delivery fell $ 3.31 to settle at $ 91.98 a barrel, down 3.47%, the lowest closing price since Aug. 3. Week, New York oil prices since fallen to 7.09%. 

The price of Brent crude oil futures fell $ 3.84 to close at $ 108.19 a barrel, down 3.43%, the same as the lowest closing price since Aug. 3. Since this week, Brent crude oil fell 7.26 percent.