There have been a series of incidents in which flames and smoke were seen coming from the Mossmorran plant's main chimney.Read more
Exxon Mobil's first quarter earnings results have failed to impress investors.
Despite a rise in global crude oil prices, the firm only managed to grow earnings by 16% to $4.65bn compared to the same period in the previous year.
It also saw a decline in production of over 5%, because its longer-term drilling projects in places like Brazil and Guyana have yet to bear fruit.
"Exxon has spent the last several months trying to explain its strategy to investors who are growing impatient," said Reuters columnist Lauren Laughlin.
"Other bumps in the quarter show that shorter-term projects are needed to fill the gap until it can fully extract oil from its deeper well projects."
The plant in Fife has been issued with warning notices after a nine-day flaring incident last year.