houston june 2 reuters  venezuelas oil exports fell 14 in may from the previous month as crude upgraders at its main oil region produced less exportable grades and staterun oil firm pdvsa struggled to replenish inventories according to shipping data and documents pdvsa is under a widespread anticorruption probe that uncovered billions of dollars in unpaid cargoes and led to a temporary suspension of some contracts the investigation has led to more that 60 people arrested and a management overhaul  in may pdvsa and its joint ventures shipped an average of 606258 barrels per day bpd of crude and refined products below the prior two months but higher than the first two months of the year when the contract suspension halted some exports data based on vessel tracking showed pdvsa and other state companies separately exported some 209000 metric tonnes of methanol urea and petroleum coke the lowest amount so far this year usbased oil major chevron corp cvxn  which has ramped up exports of venezuelan crude since receiving a us authorization in november shipped some 149000 bpd last month to the united states and to a storage terminal in the bahamas in april it had exported about 141000 bpd pdvsa also increased its deliveries of crude and fuel to political ally cuba to 58100 bpd in may from 45250 bpd in april data and internal company documents showed venezuelas stocks of flagship merey 16 heavy crude fell to 12 million barrels at the end of may from 189 million barrels the previous month inventories of lighter domestic crudes for diluting the orinoco belts extra heavy output declined 44 to 930000 barrels in that period according to one of the documents the crude oil upgrader at the pdvsachevron petropiar joint venture ended last month producing some 80000 bpd of upgraded crude versus 90000 bpd at the end of april the document added a 21 millionbarrel cargo of iranian condensate arrived in venezuelan waters at the beginning of may but the vessel had not discharged by monthend according to tankertrackerscom