China consumes 13 million barrels per day and imports 9 million barrels per day. You have oil reserves of 25 billion barrels at present.
http://www.worldstopexports.com/top-15-crude-oil-suppliers-to-china/
"
- Russia: US$37.9 billion (15.8% of China’s total imported crude)
- Saudi Arabia: $29.7 billion (12.4%)
- Angola: $24.9 billion (10.4%)
- Iraq: $22.4 billion (9.4%)
- Oman: $17.3 billion (7.2%)
- Brazil: $16.2 billion (6.8%)
- Iran: $15 billion (6.3%)
- Kuwait: $11.9 billion (5%)
- Venezuela: $7 billion (2.9%)
- United States: $6.8 billion (2.8%)
- United Arab Emirates: $6.7 billion (2.8%)
- Congo: $6.4 billion (2.7%)
- Colombia: $5 billion (2.1%)
- Malaysia: $4.8 billion (2%)
- Libya: $4.7 billion (2%)"
LOL - The only one on that list that you will have guaranteed oil exports from is Russia. Most of the rest you will have to go through waters controlled by USN.
Dude, you think that you can increase oil imports like turning on a tap like that? It will take years of infrastructure upgrades to allow the supply to even be increased by 1 million barrels a year.
Even in your own country you will need years to supply any meaningful extra quantity of oil and you have only 25 billion barrels to start with.
China is truly stuffed if the USN decides to block it's oil supplies.