As many as 30 deep-water drillships and semi-submersible rigs have been offered by about one-and-half-dozen companies to ONGC in the tender.
"The response we have received is unprecedented. Never have been witnessed such intense competition which we hope will translate into rig rates coming down," a senior ONGC official said.
National oil companies like ONGC are the only ones in the world who are going ahead with new field developments while the global majors postpone investments in view of oil prices halving to less than USD 50 per barrel.
The trend of falling charter rates was visible last month when Reliance Industries extended lease period of Dhirubhai Deepwater KG2 rig of US rig contractor Transocean by three months for a dayrate of USD 295,000, which is USD 100,000 less than the previous contract.
The new contract will expire in October.
The official said aggressive bidding by rig players is likely to lead to rock-bottom dayrates in the ONGC tender.
The company had in 2010 hired Platinum Explorer rig from Vantage for USD 585,000 a day and Sevan Driller-II from Norway's Sevan Marine ASA for dayrate of USD 524,900.
Prior to that in 2009, it had also taken on lease from Reliance Industries DDKG-1 rig for USD 510,000 per day.
The lowest rate ONGC has ever got was in 2008 when it had hired Discovery Seven Seas deep-sea drill ship from Transocean at a dayrate of USD 357,000.
Nine drillers offered 13 rigs in the first tender for three anchor-moored rigs capable of operating in water depths up to 2,500 feet.
Bidders include China Oilfield Services (COSL), Diamond Offshore, Northern Offshore, Opus Offshore, Seadrill, Queiroz Galvao, Transocean, Ratnamani Oilfield Services and Dynamic Drilling.
ONGC got offers for 19 rigs from almost a dozen companies for its second tender for ultra-deepwater drilling units.
Bidders include Vantage Drilling, COSL, Seadrill, Aban Offshore, Transocean, Russia's Joint Stock Company, Ocean Rig, Universal Energy, Dynamic Drilling, Paragon, Ratnamani Oilfield services and Dolphin.
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