Vietnam's crude oil output in April is estimated at 1.009 million tonnes, or 247,000 barrels per day, down 11.8 percent from a year earlier, the government said on Sunday.

Vietnam's January-April crude oil exports dropped 41.4 percent year-on-year to an estimated 1.24 million tonnes.

Crude oil export revenue in the first four months of 2018 fell 24.9 percent to $668 million, the government's general Statistics Office said.