The US-Venezuela oil deal could boost heavy crude supplies for US refiners and widen discounts on heavy grades, TPH Energy Research said in a Monday note.
US refiners processed 18.3 million barrels per day this year, including 4 million b/d of heavy crude from foreign suppliers, TPH Energy Research said.
Heavy crude imports fell from 4.5 million b/d during 2016 to 2018, but Venezuela increased US shipments to 341,000 b/d from 140,000 in 2025.
Venezuelan shipments reached 471,000 b/d in May 2026, accounting for about one-third of the country's 1.1 million b/d of production, according to the note.
Valero Energy (VLO) led Venezuelan crude imports at 137,000 b/d, up from 69,000 in 2025, followed by Chevron (CVX) at 52,000 b/d and Phillips 66 (PSX) at 46,000 b/d, TPH said.
Citgo imported 29,000 b/d and PBF Energy (PBF) took 24,000 b/d, while third-party traders Vitol and Trafigura handled 40,000 barrels per day, some of which could reach US refiners.
Additional heavy crude supply could widen discounts, with Maya and Western Canadian Select at Houston trading $11 per barrel and $14/bbl below Brent, versus $8/bbl and $7/bbl in 2025, TPH said.