PilSun Holding – Photo Group: The 26th International Exhibition of Oil, Gas, Refining, and Petrochemicals started on Friday (May 13th). This year’s exhibition, with the resurgence of the oil industry, is witnessing the presence of 44 foreign companies from 11 countries around the world. The event is open from 9 AM to 4 PM and will conclude on Monday (May 16th).