Some 1,500 domestic companies showcase their latest achievements in the oil, gas and petrochemical industries.
There are also 200 foreign companies from 13 countries, namely Russia, China, Belarus, Germany, Austria, Italy, France, Spain, India, the United Arab Emirates (UAE), Oman and Turkey, displaying their latest achievements.
Senior managers and directors of main domestic companies and activists in the oil, gas and petrochemical industries attended the inauguration ceremony.
The exhibition will run through Saturday, May 20.