OPEC will seek on Saturday to persuade other oil producers to lower production as part of a newly struck global pact to stem a crude glut and lift painfully low prices.
The Vienna meeting, which includes major producer Russia, aims to nail down details on implementing the accord reached late last month.
Analysts however remained divided over the gathering's impact as doubts lingered regarding countries' willingness to freeze output.
"We do not expect the outcome of this meeting to play a significant role in rebalancing the oil market," Vienna-based analyst group JBC Energy said Friday.
The Organization of the Petroleum Exporting Countries agreed on November 30 to lower its monthly output by 1.2 million barrels per day (bpd) to 32.5 million bpd as of January.
Under the deal, OPEC also wants oil-producing nations outside the group to lower their output by 600,000 barrels a day.
Moscow -- the world's largest oil producer along with OPEC kingpin Saudi Arabia -- has already signalled it would provide half of that production cut in the first half of 2017.
This leaves the remaining 300,000 barrels a day to be divided between the other non-OPEC nations.
Oil prices climbed Friday amid hopes for a deal. In late European business, WTI crude stood at $51.44, 60 cents up on the day, while Brent rose 20 cents to $54.09. I
- 'No decision made' -
Of the 14 invited countries, 10 are expected to attend Saturday's gathering at OPEC's headquarters, according to the Bloomberg news agency.
Some analysts were optimistic that details of the deal would be finalised.
"We expect the meeting between OPEC and non-OPEC producers to result in a credible document, which we think will be supportive for prices," said Bjarne Schieldrop, chief commodities analyst at top Nordic corporate bank SEB.
The November agreement ended weeks of uncertainty and volatility on crude markets, pushing prices above $50 for the first time in a month.
It also represented a dramatic reversal from OPEC's Saudi-led game plan, introduced in 2014, of flooding the market to force out rivals, in particular US shale oil producers.
The strategy saw production outstrip demand, causing prices to plunge from more than $100 a barrel in June 2014 to near 13-year lows below $30 earlier this year.
OPEC now seeks a global cut of 1.8 million barrels a day to help rebalance the market.
The group -- which produces around 40% of the world's crude -- needs non-OPEC members to join the cuts in order to drain current stockpiles.
But Bloomberg calculations, based on OPEC data, indicated that there would be little overall reduction in record oil inventories in 2017 -- even if OPEC can convince non-members to come onboard.
"Non-OPEC producers, such as Mexico, Azerbaijan and Colombia, are likely to dress up involuntary production declines, already factored in by traders, as cuts," according to Bloomberg.
In addition, Mexico and Kazakhstan plan to ramp up their crude production next year.
And although Russia announced Wednesday that national oil companies backed cuts of 300,000 bdp, news agencies quoted Lukoil chief executive Vagit Alekperov as saying "No decision was made."
The slide in oil prices and Western sanctions over Moscow's role in the Ukraine crisis have pummelled the Russian economy.
"For now we are not assuming that Russia will deliver on the promised cuts but we are ready to change this assumption if we see lower exports coming out of Russia," said DNB Markets on Friday.
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