Besides Oil and Natural Gas Corp (ONGC) and ONGC Videsh Ltd (OVL), Moody's placed the ratings of Oil India Ltd amongst 120 global exploration and production firms on review for downgrade.
"These reviews reflect a mix of declining prices that are near multi-year lows, weakening demand and a prolonged period of oversupply that will continue to significantly stress the credit profiles of companies in the oil and gas sector," it said.
Of the 120 companies, seven are from south and southeast Asia. These include Pertamina of Indonesia, Malaysia's Petroliam Nasional Berhad or Petronas and PTT Exploration & Production of Thailand.
Moody's said it is placing local currency issuer rating of Baa1 of ONGC on review for downgrade. The same has been done for the foreign currency issuer rating of Baa2 of ONGC Videsh and Oil India's Baa2 Backed Senior Unsecured Regular Bond/Debenture rating.
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Stating that it has adjusted its view downward for the likely range of prices, the rating agency said it saw "a substantial risk that prices may recover much more slowly over the medium term than many companies expect, as well as a risk that prices might fall further."
"Even under a scenario with a modest recovery from current prices, producing companies and the drillers and service companies that support them will experience rising financial stress with much lower cash flows," it said.
"Iran is poised to add more than 500,000 barrels per day to global supply while OPEC and many non-OPEC oil producers continue to produce without restraint as they battle for market share.
"The addition of Iranian oil to the market this year will offset or exceed expected declines in US production of about 500,000 bpd," it said.
The increased production vastly exceeds growth in oil consumption, given modest growth in consumption from major consumers such as China, India and the US.