Crude stocks at the Cushing, Okla., delivery hub for U.S. crude futures rose by 1.8 million barrels to 47.8 million barrels, their highest since December 2017, the EIA data revealed.
Weather-related event disabled mobile ship-loader and crane at the Texas port.
South Korean company seeks to diversify away from costlier naphta as feedstock for ethylene.
Chevron wanted the Pasadena refinery purchased from Petrobras to process sweet crude coming from its oil fields in the Permian Basin of Texas.
The EIA reported crude inventories rose 9.9 million barrels in the week to April 26 to 470.6 million, compared with analysts' expectations for an increase of 1.5 million barrels.
U.S. crude oil stockpiles rose last week to their highest in about a year and a half as imports increased, even as refiners sharply ramped up output, the EIA says.