The phrase "few barrels" means there is not a lot or only a small amount of something, typically referring to the quantity of oil or any other substance that can be stored in barrels. Full definition
By contrast, pipelines spilled 35 per cent fewer barrels of oil during the same period. (canadianbusiness.com)
Saudi Arabia production dropped by 58,000 barrels per day to 10.1 million barrels per day by December 2015; Iraq's output was down 31,000 barrels per day to 4.3 million barrels per day; Kuwait's drilling produced 23,000 fewer barrels per day, down to 2.7 million barrels per day; and Nigerian production dropped by 77,000 barrels per day to 1.8 million barrels per day. (oilprice.com)
But in the case of Knob Creek ® Single Barrel Reserve, Knob Creek chooses a select few barrels for their distinct quality to be bottled individually. (fb101.com)