Cairn India, which began production at the Mangala oil field in Rajasthan on 29 August, is currently pumping crude at 20,000 barrels per day.
Cairn India, the operator of the Rajasthan oil fields, has so far produced and sold a million barrels of crude from the nation's most prolific on-land field.
Cairn India on Sunday dispatched over 200,000 barrels of crude from the Mangala field to Mangalore Refinery and Petrochemicals Ltd from Kandla port.
Cairn had earlier despatched two cargos of crude to MRPL, port officials were quoted as saying.
Cairn has also sold a cargo to Reliance Industries Ltd earlier this month.
At one million barrels of production, Cairn India is estimated to have generated over Rs232 crore ($50 million) in revenues and contributed more than Rs78.9 crore ($17 million) in revenues to the central and state governments in just three months.