While most members of the cartel are likely to follow the lead of Saudi Arabia, there are indications that members Iran, Iraq and Venezuela are preparing to veto any move to increase production.
"Three OPEC founders are going to stop it", Iran's representative to the bloc Hossein Kazempour Ardebili said in comments to Bloomberg yesterday.
Brent reached a 3-1/2-year high above $80 a barrel last month but has fallen steadily in recent weeks as Saudi Arabia, de facto leader of OPEC, has signaled it intends to raise production to stabilize prices.
Suhail bin Mohammed Faraj Faris Al Mazrouei, Minister of Energy and Industry, and President of the Organisation of Petroleum Exporting Countries (OPEC) Conference for 2018, has expressed his optimism over regaining balance to the global oil market, thanks to the cooperation between the OPEC, and its partners.
Notably, the present deal, effective Jan 1, 2017, requires global oil producers to lower their collective output by 1.8 million barrels per day (bpd) to the end of 2018 to shed huge stockpiles.
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It was the most prominent story on the homepage of the conservative news outlet, Breitbart , which called it a "fake news photo ". I asked her, why? Valera felt helpless and distressed "imagining my daughter in that situation", he said.
OPEC officials are also working on putting the cooperation between the cartel, Russian Federation and other oil producers - the so-called OPEC+ group now comprising 24 nations - on a permanent footing.
'Opec typically put aside political rivalries and agree on economic ones, but there is no disputing the current differences, which will make this meeting much more controversial and uncertain, ' said Rebecca O'Keeffe, head of investment at Interactive Investor.
Increased production of U.S. shale oil took some sheen away from the anticipated impact of the output cuts.
Some other countries such as Venezuela, can't increase Oil exports regardless of the output because of sanctions.
From outside, Trump is attacking the cartel on Twitter for artificially inflating prices and lobbying hard behind the scenes for a significant production increase.
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The government is resisting the changes, which are aimed at softening the terms of the U.K.'s exit from the European Union . Speaking on BBC radio on Tuesday morning, Mr Davis said a meaningful vote would not lead to Britain staying in the EU.
"Oil prices are reversing this morning's bout of weakness as bottom pickers enter the fray ahead of this week's crucial OPEC/non-OPEC meeting", said Stephen Brennock, analyst at London brokerage PVM Oil Associates.
In April-May, oil prices reached their four-year maximum.
The next meeting of the parties to the deal will be held on June 23 in Vienna, while the meeting of the OPEC members will take place one day earlier.
Last year, states could have collected as much as $13.4 billion in additional online sales taxes, according to the Government Accountability Office. Output in Saudi Arabia jumped by 85,500 barrels a day, but was partly offset by production outages in Nigeria, Venezuela and Libya. Roberts said production from the Permian Basin, the biggest shale deposit, is being curbed because of infrastructure bottlenecks to get oil delivered to refineries.
Elsewhere, Venezuela, which faces the threat of USA sanctions and is in the midst of an economic crisis, is almost a month behind delivering crude to customers from its main oil export terminals, and chronic delays and production declines could breach state-run PDVSA's supply contracts if backlogs are not cleared soon.
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Both countries would struggle to increase output. "A meaningful increase in long-haul flows from some of the key OPEC exporters would go a long way in turning the crude tanker market around, especially since it will impact the physical market as well as provide a boost to the all-important market psychology".