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1889
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W.L.Lake of Assam Railway and Trading Co. (AR & T Co) started Digboi Well No-1 Lake
used to urge his men “Dig boy, dig” and hence the name “Digboi” The discovery of
the ‘Digboi Oil field’ in Upper Assam was a landmark in the history of oil.
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1899
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AR&T Co formed a new company Assam Oil Company (AOC) and set up a small refinery
at Margharita (Upper Assam) with a capacity of 500 bopd to refine the Digboi-oil.
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1901
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Digboi refinery commissioned.
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1911
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Burmah Oil Company (BOC) arrives on the Indian scene .
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1921
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Burmah Oil Company (BOC) takes over Assam Oil Company (AOC).
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1925
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India’s first attempt to use geophysics in its search for oil with a Torsion balance
survey in the Bordubi area.
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1937-39
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Seismic surveys were initiated in and a major ‘High’ was located at Nahorkatiya
in Assam The successful outcome of NHK-1 was a triumphant vindication of the geophysical
methods of exploration.
Nahorkatiya triggered a new wave of enthusiasm in the search for oil in the country
and became the forerunner of discoveries not only in Assam basin but also in other
basins.
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1948
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Geological Survey of India (GSI) started geophysical surveys in Cambay area.
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1956
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Moran oil field discovered by AOC.
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August 14, 1956
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Oil & Natural Gas Commission (ONGC) was established.
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October 15, 1959
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ONGC becomes autonomous body, under an act of parliament.
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1959
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Oil India Private Ltd (OIL) incorporated and registered as a Rupee Company.
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1960
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Oil struck at Ankleswar in Gujarat and Rudrasagar in Assam.
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1961
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GOI and BOC become equal partners in OIL.
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1962
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The first public sector refinery comes up at Guwahati.
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1963
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World’s first crude oil conditioning plant commissioned at Nahorkatiya. India’s
first deviated well NHK122 drilled by OIL.
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1963
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ONGC started offshore seismic surveys in Gulf of Cambay.
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1968
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Oil discovered in Geleki by ONGC.
OIL commissioned the 1158 km oil pipeline to Guwahati and Barauni refineries.
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1970
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India’s first offshore well spudded in the Gulf of Cambay.
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1974
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Drillship Sagar Samrat strikes oil in Bombay High.
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1974
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Bombay High discovered.
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1981
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First well spudded in Godavari offshore.
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14 October 1981
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OIL becomes a Government of India enterprise.
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1983-84
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Gas struck at Razole in Andhra Pradesh and Gotaru in Rajasthan.
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1984
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First Early Production system (EPS) commences in Gujarat .
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1984
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Gas was struck at Gotaru in Rajasthan by ONGC.
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1984-85
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Oil struck in kutch offshore, Godavari offshore and Changmaigam in Assam.
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1986-87
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ONGC strikes oil in the Tapti offshore area and Namti structure (Assam).
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1988-89
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Commercial gas finds in Rajasthan by OIL Nada field in Gujarat discovered .
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1989-90
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Western offshore production reaches a peak of 21.72 MMT.
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1989-90
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South Heera field discovered in Mumbai offshore.
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1998
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New Exploration Licensing Policy (NELP) launched and 48 Exploration blocks offered
under round-I.
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2000
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Second round of New Exploration Licensing Policy launched and 25 Exploration blocks
offered .
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2002
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Third round of New Exploration Licensing Policy launched and 27 Exploration blocks
offered.
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2003
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Fourth round of New Exploration Licensing Policy launched and 24 Exploration blocks
offered.
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2005
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Fifth round of New Exploration Licensing Policy launched and 20 Exploration blocks
offered .
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2006
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Sixth round of New Exploration Licensing Policy launched and 55 Exploration blocks
offered .
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2007
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Seventh round of New Exploration Licensing Policy launched and 57 Exploration blocks
offered .
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