Iran, India's third biggest oil supplier, used to give a 90-day credit period to refiners like Indian Oil Corp (IOC) and Mangalore Refinery and Petrochemicals Ltd (MRPL) to pay for the oil they would buy from it.
Now, Tehran has reduced this to 60 days, essentially means that IOC and MRPL would have to pay for the oil they buy from Iran in 60 days instead of previous liberal term of 90 days, sources privy to the development said.
Other Middle-East sellers offer not more than 15-day credit period.
Sources said National Iranian Oil Co (NIOC) has also decided to cut the discount it offers to Indian buyers on freight from 80 per cent to about 60 per cent.
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IOC and MRPL -- largest state buyers of Iranian crude -- will cut imports from Tehran to 4 million tonnes in 2017-18 from 5 million tonnes in the previous year.
Iran has deterred in awarding rights to develop the 12.5 trillion cubic feet discovery OVL had made 10 years back and now New Delhi is using its oil imports as a bargaining tool to get Tehran to agree.
Earlier this week, Iranian Oil Minister Bijan Zangeneh had dismissed the threat of cutting imports, saying, "We cannot enter deals under threats."
India is Iran's second biggest oil buyer after China and was among a few which had continued to import crude despite Western sanctions against Tehran.
Since lifting of the sanctions last year, Iran is playing hardballs over award of rights to develop Farzad-B gas field in the Persian Gulf to OVL, the overseas arm of state-owned Oil and Natural Gas Corp (ONGC).
OVL has submitted a revised master development plan of over USD 5 billion for developing the field.
The two nations were initially targeting concluding a deal on Farzad-B field development by November 2016 but later mutually agreed to push the timeline to February 2017.
Now, the deal is being targeted to be wrapped up by September after the two sides agree on a price and a rate of return for OVL's investments.
Farzad-B was discovered by OVL in the Farsi block about 10 years ago. The project has so far cost the OVL-led consortium, which also includes Oil India and IOC, over USD 80 million.
It felt the USD 5 billion cost OVL and its partners have put for developing the field was on the higher side and wanted it to be reduced. OVL will earn a fixed rate of return and get to recover all the investment it has made in the field development.
The field in the Farsi block was discovered by the OVL- led consortium in 2008. It has an in-place gas reserve of 21.7 tcf, of which 12.5 tcf is recoverable.