Chevron warned its profits for the third quarter may take a hit because of lower production volumes for the year.
"Upstream results for the third quarter are projected to be slightly higher than the prior quarter while downstream earnings are expected to be significantly lower," it said in a statement Wednesday.
Its first quarter oil equivalent production in the United States was 664 million per day while second quarter was 659 million barrels of oil equivalent per day. Through August, it said its third quarter net U.S. production stood at 651 boe.
"U.S. net oil-equivalent production was slightly lower, primarily due to planned turnaround activity across multiple assets in the Gulf of Mexico," the company said.
Its refinery input was higher for the year because its Richmond refinery in California returned to service during the second quarter of 2013.
Chevron closed parts of its Richmond oil refinery after an explosion and fire in August 2013. Federal investigators said refinery workers were trying to stem a leak from an 8-inch line at a refinery unit before the fire started.
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