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By Henning Gloystein
But some traders are sounding a warning - the world's biggest crude consuming region, Asia, is showing signs of an impending downward correction.
Prices for Brent crude oil futures, the international benchmark for oil prices, have risen by more than 50 percent since mid-2017 and hit $70 per barrel this week for the first since December 2014. Average Asian physical crude oil prices also moved over $70 per barrel in January.
One reason, traders say, is that the supply of oil products remains ample. In the last three years, refiners enjoyed high profits because of relatively cheap crude oil, which is used to make fuels like diesel or gasoline.
As a result, Asian refiners processed an unprecedented 23 million barrels per day (bpd) of crude oil in late 2017.
China, by far Asia's biggest oil consumer, is now producing so much fuel that its refiners have turned to exports to find buyers. And their purchases of crude could fall.
Chinese diesel exports have surged by almost 3,000 percent since early 2015, to a record of more than 2 million tonnes last December, according to customs data. Its gasoline exports are up by 365 percent since early 2015, to more than 1 million tonnes in December.
Its total December refined oil products reached a record 6.17 million tonnes, according to customs data announced on Friday.
"This drop in margins could reduce Asian refiners' demand for incremental crude in the near term and weigh on global (crude) prices," said Sukrit Vijayakar, director of energy consultancy Trifecta.
Singapore refining margins, which act as Asia's benchmark, have slumped by 90 percent from their 2017 high, to below $6 per barrel this week - the lowest seasonal level in five years.
BMI Research said in a note this week: "In Q1, the balance of risk to Brent (prices) lies to the downside."
WHAT FUELED THE RALLY
The crude market's focus has so far been on signs of tightening supplies as the Middle East dominated Organization of the Petroleum Exporting Countries (OPEC) and Russia lead production cuts aimed at propping up prices.
With global oil consumption also strong amid healthy global economic growth, investor sentiment has been positive.
Yet, another of the bearish signals is rising U. S. oil production, which is threatening to derail OPEC's and Russia's efforts to tighten supplies.
Despite a recent drop due to extreme cold, U. S. crude oil output is widely expected to break through 10 million bpd soon, largely thanks to shale production, which would take it to similar levels as top producers Saudi Arabia and Russia, who hit peak output of over 11 million bpd and about 10.7 million bpd respectively in recent years.
"Oil prices have been undeniably bullish this week despite the lingering concerns over the current bull rally running out of steam . . . It must be kept in mind that rising production from U.
The U. S. Energy Information Administration (EIA) expects U. S. output to surpass 11 million bpd by 2019.
Soaring U. S. supplies mean U. S. WTI crude prices are over $5.5 per barrel cheaper than Brent, off which most international crude supplies are priced.
Feeling the pinch from mounting competition and the pressure from refiners, OPEC's No.2 and No.3 producers, Iran and Iraq, cut their crude oil prices this week to remain competitive with customers struggling from lower profits.
(Reporting by Henning Gloystein; Editing by Raju Gopalakrishnan)