Oil prices rose by more than 2% on Dec. 21 after data suggested a larger than expected draw in U.S. crude stockpiles, but gains were capped by growing concerns over demand in China and a snow storm that is expected to hit U.S. travel.

Brent crude futures were up by $1.77, or 2.2%, at $81.76 a barrel by 1306 GMT. U.S. WTI crude futures gained $1.68, or 2.2%, to $77.91.

U.S. crude inventories fell by about 3.1 MMbbl in the week to Dec. 16, said market sources, citing data from the American Petroleum Institute. Nine analysts polled by Reuters had forecast a drop of 1.7 MMbbl. Official government data is due at 1530 GMT.

Prices were also boosted by comments from Saudi Arabia's energy minister, who said on Dec. 20 that the heavily criticized move by OPEC+ to cut oil output turned out to be the right decision.

The comments suggest that OPEC+ may continue to keep supply tight, said CMC Markets analyst Tina Teng.

Potentially curtailing oil demand, huge parts of the United States are forecast to face heavy snow that is likely to cause flight delays and impassable roads during one of the busiest travel periods of the year.

Worries about surging COVID-19 cases in China as the country begins dismantling its zero-COVID policy kept oil prices from moving higher.

However, China's crude oil imports from Russia in November rose 17% year on year as Chinese refiners rushed to secure more cargoes ahead of a price cap imposed by the Group of Seven nations and an EU embargo from Dec. 5.

Overall, Russian oil exports fell by 11% month on month for Dec. 1-20 after the European Union's embargo on Russian oil came into force, the Kommersant daily reported.