The global oil and gas industry is bracing for ongoing supply constraints in the coming weeks, energy industry leaders and market analysts agree — even if long-running tensions between the United States and Iran are resolved through a new peace agreement. Industry experts caution that restoring full oil shipments out of the Persian Gulf region and rebuilding depleted global inventories will take months, meaning oil producers will have to continue drawing on stored stockpiles for a prolonged period to meet soaring seasonal demand this summer.