A flotilla of Saudi tankers loaded with crude oil has begun arriving on the U.S. Gulf Coast, worrying American shale producers who face uncertainty because of an oversupply of oil.
At least 18 very large crude carriers, each carrying 2 million barrels of oil, are headed to the U.S., according to Michelle Wiese Bockmann, markets editor and oil analyst for Lloyd's List, a shipping news service in London.