Global oil stocks drop almost 270 million barrels since start of Iran war Global oil inventories are falling sharply as the Israeli-US war on Iran constrains crude flows from the Gulf following the closure of the Strait of Hormuz, according to a Bloomberg report. The data shows stockpiles declined by about 4.8 million barrels per day between March 1 and April 25, pushing global reserves towards their lowest levels since 2018. Energy executives told Bloomberg the downward trend is likely to continue in the near term, as supply disruptions persist.