The oil and gas downstream sector has no less importance and effect on developing the countries’ economy than the upstream and midstream sectors. Globally, 2017 proved to be a successful year for the downstream sector in which products demand and refinery margins improved and the global market was under attempts for rebalancing. In fact, oil demand grew by 1.7%, reaching 97 million barrels per day (b/d) in 2017, having such an acceleration in the oil demand managed to support developing the downstream sector. Moreover, the increasing oil demand came in line with pushing the global economic wheel which was reflected in the growing consumption of oil products in both the Organization for Economic Cooperation and Development (OECD) countries and non-OECD countries, according to the Organization of the Petroleum Exporting Countries (OPEC) Annual Statistical Bulletin 2018.