He complains about not having access to more funds, lack of spares and says he feels the effects of the latest US sanctions.

However, he remains confident that managers at the National Iranian South Oil Fields Company (Nisoc) are gaining ground on the ageing fields in their charge.

"Last year, we replaced the 280,000 barrels per day lost to depletion, and added another 22,000 bpd to our capacity," he says.

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