Adds details on crude quality issues from Mars pipeline.
ExxonMobil will borrow up to 1mn bl of crude from the US Strategic Petroleum Reserve (SPR) for its 522,500 b/d refinery in Baton Rouge, Louisiana, in response to a disruption to offshore supply of crude for the facility.
ExxonMobil warned suppliers last week of "serious quality issues" related to elevated levels of zinc in crude supplied by the Mars pipeline, which brings crude from a series of deepwater fields in the Gulf of Mexico to shore, according to market sources.
In letters to suppliers ExxonMobil said the crude quality issues were "... significantly affecting the operations at our Baton Rouge Refinery," and that it would stop accepting Mars crude "... in an effort to avoid further damages."
The US Department of Energy said today it had approved the loan to ExxonMobil, called an exchange, to ensure a stable supply of transportation fuels in Louisiana and the US Gulf coast. The agency said the crude loan will support ExxonMobil's "restoration of refinery operations that were reduced due to an offshore supply disruption."
Chevron, one of the producers that contributes crude to the Mars pipeline, said it has "identified a potential contributing source to the Mars crude composition changes, which is associated with the start-up of a new well." Chevron said it was working to resolve the matter and does not expect it to affect current production guidance.
In April Chevron started production from a new deepwater field, Ballymore, which ties into the Mars system.
Shell, which owns a majority stake in the Mars pipeline, did not respond to a request for comment.
Mars premium to WTI falls
The August Mars premium to Nymex-quality WTI has dropped nearly $1/bl in the last week.
The August Argus Mars volume-weighted average assessment on Thursday was a 9¢/bl premium to the Nymex-quality WTI Cushing benchmark, nearly $1/bl lower than a week earlier. Mars averaged a 63¢/bl premium for the August trade month through Thursday, but was at a $1.40-$1.50/bl premium at the start of the trade month. The August trade month started 26 June and ends 25 July.
The SPR, which consists of four underground storage sites in Texas and Louisiana, held 403mn bl of crude as of 4 July. Under the exchange announced today ExxonMobil will eventually return the borrowed crude — along with additional crude as payment for the loan — to the SPR.
The SPR's Bayou Choctaw site connects to refineries in Baton Rouge through the Capline pipeline. In 2021, the Department of Energy authorized a loan of up to 3mn bl from the SPR to ExxonMobil's refinery in Baton Rouge to address disruptions related to Hurricane Ida. ExxonMobil was initially scheduled to return the crude in 2022, but that deadline has been repeatedly pushed back, most recently to require a return of the crude by March 2026.

