(Adds NIOC quote on undeveloped fields)
DUBAI, March 12 (Reuters) - Iran is to launch four new phases at South Pars, the world's largest gas field, with a production capacity of up to 110 million cubic metres per day, the oil ministry said on Twitter on Tuesday.
No additional information was provided on when the four new phases would be launched.
Oil Minister Bijan Zanganeh told state TV last month that Irans gas production at South Pars had hit 610 million cubic metres per day.
The offshore field is shared between Iran and Qatar, which calls it North Field,
Irans daily gas production from the field now exceeds that of Qatar, Zanganeh said last month.
The oil ministry's news agency SHANA quoted a project manager in South Pars phase 13 as saying on Tuesday that a gas refinery in the field was fully operational and ready to be inaugurated by President Hassan Rouhani.
"The refinery of the phase is fully operational... The first shipping of gas condensate from phase 13 was delivered on March 11 for exports," Payam Motamed, operator of South Pars phase 13 project said, adding that the refinery has the capacity to process 56.6 million cubic metres of gas a day.
He said around $5 billion was invested for the development of the fields phase 13 and that the total value of the daily products from it was $5 million.
Iran needs foreign investment to boost output from its oil and gas reserves because production has been crippled by years of Western sanctions.
A manager in National Iranian Oil Company NIOC said on Tuesday that there were currently 200 undeveloped oil and gas fields in Iran.
"The recovery rate of Iranian fields is 10 percent lower than the average rate of recovery in the world," Karim Zobeidi, the NIOC's deputy for planning was quoted as saying by SHANA.
Frances Total and China National Petroleum Corp (CNPC) suspended investment in the South Pars project last year after the United States threatened to impose sanctions on companies that do business in Iran.
The United States reimposed sanctions on Irans energy and banking sectors after Washington withdrew from the 2015 nuclear agreement between Tehran and world powers.
The agreement had imposed limits on Irans nuclear ambitions in exchange for sanctions relief.
(Reporting by Sylvia Westall, Babak Dehghanpisheh and Bozorgmehr Sharafedin, editing by Kirsten Donovan and Emelia Sithole-Matarise)