"We firstly need to discuss and decide about the main issue inside OPEC".
But OPEC was struggling to agree on raising output, with Saudi Arabia warning of supply shortages and price rallies and Iran holding out against a deal.
Oil futures settled lower before an OPEC meeting expected to increase the world's supply of crude.
In a night of drama in Vienna, the Joint Ministerial Monitoring Committee, which recommends policy to the group, reached an agreement despite Bijan Zanganeh, the Iranian oil minister, walking out of the meeting and predicting Opec won't reach a final deal when it meets formally on Friday.
Iran, who was in favour of an output increase in order to benefit from the lifting of sanctions imposed due to its euranium enrichment programme, now want to keep cuts.
OPEC takes its decisions by unanimity, so if Iran were to wield its veto Saudi Arabia would be left only with the option of assembling a coalition of willing countries to bypass Tehran's opposition.
The 24 nations in the pact, known as OPEC+, are now keeping more than two million bpd off the market.
Saudi Arabia claims that production restraints and geopolitical factors have actually seen output fall by far more, to around 2.8 million bpd.
Brent oil prices rose 1% to 74.03 in London trading on Friday.
The convoluted plan shows the difficulty Saudi Arabia has in bridging the gap between the competing interests of different members.
The move infuriated Iran, and Zanganeh refused to sign up to the meeting's decision to raise output.
After almost two years of relative unity, the talks in Vienna this week have found Opec divided. "OPEC is not part of the Department of Energy of the United States".
Falih has warned the world could face a supply deficit of up to 1.8 million bpd in the second half of 2018 and that Opec's responsibility was to address consumers' worries.
"We want to prevent the shortage and the squeeze that we saw in 2007-08", Falih said, referring to a time when shortages sent premium-crude-oil prices soaring to an unprecedented $150 per barrel and ushered in a major boom-bust cycle that devastated the oil sector for a decade.
But in practice it would mean a much smaller boost of less than a 10th of that amount, effectively from Saudi Arabia.
"OPEC is an independent organization, not an organization to receive instruction from President Trump", Zanganeh said on Tuesday.
On Friday, Zanganeh said Opec would change the structure of the current deal, but declined to elaborate.
Saudi Arabia is reportedly looking to increase production by 1 million barrels per day, while Russian Federation has said it would like to see an extra 1.5 million barrels per day to the market before reassessing the next move.
Mr. Pradhan went on to say that the prices of oil and gas had become subject to the "vagaries of geopolitics" and urged the OPEC countries to commit towards ensuring more sustainable prices.