The four-day exhibition officially started its work this morning with over 1,800 Iranian and foreign companies in attendance.
An inauguration ceremony attended by Iranian Oil Minister Bijan Namdar Zanganeh, First Vice-President Eshaq Jahangiri and a number of other officials was also held in Wednesday afternoon.
Encouraging people to invest in oil industry and persuading domestic companies to manufacture oil equipment are the two key aims of holding the 20th Oil Show.
More than 1200 Iranian companies and 600 foreign companies from 29 countries have applied for participation in the event.
Companies from Italy, China, the UAE, India, Turkey, Russia, France, Belgium, Britain, Singapore, Monaco, South Korea, Ukraine, Spain, Austria, Kazakhstan, Hong Kong, Germany, and Switzerland are among the key participants in the exhibition.
Such countries as Poland and Norway have also sent their trade and economic delegations to the exhibition.