Vietnam's crude oil output in December is estimated at 1.09 million tonnes (257,700 barrels per day), down 12.1 percent from a year ago, the government said on Wednesday.

Crude oil output in November was higher than estimated at 1.24 million tonnes, the General Statistics Office said in its monthly report.

Vietnam's 2017 crude oil exports were seen rising 0.3 percent year-on-year to an estimated 6.9 million tonnes, or 138,500 barrels per day (bpd).