Deputy oil minister Roknoddin Javadi said Iran is determined to retake its market share, which plunged after the crippling sanctions were imposed in 2012.
His comments were posted on the ministry's website on Monday.
The UN nuclear agency certified on Saturday that Iran has met all of its commitments under last summer's agreement, prompting the lifting of sanctions.
Iran used to export 2.3 million barrels per day but its crude exports fell to one million in 2012.
Oil prices have recently plummeted to under 30 US dollars (£21) a barrel, a 13-year low.