If oil drilled anywhere in the world is sold on the world market, how will more drilling in the U.S. help?

Are we being sold more snake oil by the Republicans? There is no way to make oil companies sell oil drill in the U.S. or refined product from oil drilled here, on the U.S. market only. They are profit-making companies so they will sell to the highest bidder. http://fuelfocus.nrcan.gc.ca/fact_sheets/oilmarket_e.cfm show more Are we being sold more snake oil by the Republicans? There is no way to make oil companies sell oil drill in the U.S. or refined product from oil drilled here, on the U.S. market only. They are profit-making companies so they will sell to the highest bidder.
http://fuelfocus.nrcan.gc.ca/fact_sheets/oilmarket_e.cfm
Update: Oil companies are private companies. What can the government do to make them keep the oil they drill on U.S. soil here? Basis?
Update 2: What about the traders? We don't have a supply problem now but other factors are driving the prices up. How do you control that? Basis and no simpleton insults.
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