Iran's floating crude backlog grows as US sanctions squeeze China pipeline
With over 20 million barrels idling in Asian waters and Chinese imports halving in June, Tehran faces a narrowing window to clear unsold crude before the waiver expires.
More than 20 million barrels of Iranian crude have been sitting in Asian waters for at least seven days, up nearly 18 percent in a week, Kpler data show. The build comes as China's imports of Iranian crude more than halved in June to about 654,000 barrels a day from the month before, according to Kpler, leaving Tehran visibly short of buyers.6
Iran said on Wednesday (2026-07-01) that it had shipped more than 40 million barrels since the US lifted its naval blockade. Bloomberg estimates based on Vortexa data put total Iranian oil on water — in transit or stationary — at as many as 63 million barrels. Vortexa and Bloomberg calculations place the range at 58 million to 68 million barrels since the 60-day US sanctions waiver took effect in late June. The spread between those figures reflects genuine uncertainty about how much of the floating cargo has committed buyers and how much is orphaned.7,6
That gap matters for the crude market. ICE Brent front-month settled at $93.24 a barrel as of Thursday (2026-08-20), with traders pricing Hormuz disruption risk against the possibility that the floating overhang eventually clears into Asia at a discount. If Chinese refiners return, the volume is bearish. If they stay away, Tehran will have to cut prices deeper to move barrels, and the physical market tightens further.
The US sanctions architecture is making Chinese buyers cautious. Treasury's OFAC on Monday (2026-05-18) designated 12 individuals and entities for enabling the IRGC's sale and shipment of Iranian oil to China, targeting the front companies that move crude through evasion networks. China absorbs over 90% of Iranian crude exports, so narrowing that channel has direct consequences for Tehran's revenue.3,2
Iran raced to court Asia's largest buyers once the 60-day waiver took effect in late June, with conversations covering longer-term supply deals as Tehran sought commitments beyond the waiver window, traders said. But the rush ran into available supply and buyers wary of secondary sanctions exposure. The June import data from Kpler suggests that caution was already showing up before the waiver's terms were settled.5,6
The IRGC's grip on the shipping chain complicates enforcement. The force controls transport and communications across much of the Gulf and exercises a chokehold over Hormuz. Nominally private companies owned by the IRGC or affiliated with Khatam al-Anbiya handle much of the movement, and targeting the individuals behind those front companies fragments across jurisdictions and corporate veils.2
Kharg Island, which handles 90% of Iran's crude departures, adds a physical constraint. Vessels at the outermost T-jetty now operate with emergency escape procedures, according to the Economist, a sign that the threat environment has degraded routine operations. If pressure on Kharg intensifies, alternative terminals and facilities might handle 25% of what Kharg currently exports, reckons Richard Nephew, a former American envoy to Iran.2
Washington is also pursuing Iranian revenue through Iraq. OFAC last week (week of 2026-05-18) included Iraq's Deputy Minister of Oil, Ali Maarij Al-Bahadly, alongside other individuals and businesses in measures targeting exploitation of Iraq's oil sector to benefit Iran and Iran-aligned groups, according to oilprice.com. The designation signals Washington will pursue Iranian revenue streams through third-country channels, not only direct exports.4
There is a precedent for how financial pressure gets applied in these campaigns. The Patriot Act gave Treasury the power to drive banks out of business for sanctions violations, deployed against Macau's Banco Delta Asia in September 2005, according to the Economist. The current designations targeting shippers and front companies extend that playbook into maritime logistics, with banks clearing the underlying trades as the next obvious escalation point.1
The 60-day waiver created a window, but Iran's ability to clear the backlog within it looks constrained on multiple fronts: Chinese buyers pulling back, IRGC-controlled logistics under designation pressure, and Kharg operating under degraded conditions. A sustained rise in the volume idling in Asian waters beyond the waiver's expiry would force Tehran to discount more aggressively. Kpler's data on the idling barrels in Asian waters in the coming weeks is the most direct read on whether buyers are returning or holding off.6,5