Brent has gained about 24% in 2019 and WTI has risen 35%. Both benchmarks are set for their biggest yearly gains in three years, backed by a breakthrough in U.S.-China trade talks and output cuts pledged by the Organization of the Petroleum Exporting Countries and its allies.
Signs of progress in the talks between Washington and Beijing and likelihood of signing a trade deal as early as next week boosted factories' output and Chinese manufacturing activity expanded for a second straight month.
China's Purchasing Managers' Index (PMI), an index showing economic trends in the manufacturing and service sectors, was unchanged at 50.2 in December from November, but still remained above the 50-point mark that separates growth from contraction.
Also supporting the prices were rising tensions in the Middle East as thousands of protesters and militia fighters gathered outside the U.S. embassy in Baghdad to condemn U.S. air strikes against Iraqi militias.
Security guards inside the U.S. embassy fired stun grenades at protesters and the U.S. ambassador and other staff were evacuated due to security concerns. The U.S. strikes could pull Iraq further into the heart of a proxy conflict between the United States and Iran.
"Considering that Iraq is the second largest OPEC producer with production around 4.6 mbpd, market participants may add a risk premium to oil tension if tensions last for longer," UBS oil analyst Giovanni Staunovo said.
"That said, we need to see if the latest protests spread also in the south of the country, where most of the crude is exported."
Looking ahead, U.S. crude inventories are expected to fall by about 3.2 million barrels in the week to Dec. 27, potentially its third consecutive weekly decline, a preliminary Reuters poll showed on Monday.
Oil prices are likely to hover around $63 a barrel next year, a Reuters poll showed on Tuesday, benefiting from deeper production cuts by OPEC and its allies, and hopes that a U.S.-China trade deal could jumpstart economic growth.
"Oil prices, though largely expected to trade positive, will face headwinds from subdued global growth momentum and robust U.S. shale output levels in the first quarter (of 2020)," said Benjamin Lu, analyst at Phillip Futures.
(Reporting by Bozorgmehr Sharafedin in London, Jane Chung in Seoul, editing by Louise Heavens and David Evans) ((firstname.lastname@example.org;))