Tullow Oil’s Ghana unit said an unplanned shutdown on a floating production vessel at its Jubilee field offshore Ghana has disrupted exports.

Delivery "to the Ghana Gas onshore processing plant has been temporarily halted" by the shutdown on FPSO Kwame Nkrumah, the London-based company said .

“We are working hard to reinstate gas export as a matter of priority.”

Tullow last week raised its production forecast after a strong performance from its West African fields, including Jubilee.

The company raised its guidance for 2015 to as much as 70,000 barrels of oil equivalent a day from a previous upper range of 68,000 barrels, it said on July 1st. Tullow fell as much as 4.9 per cent in London, and traded 4.8 per cent lower at 304.40 pence as of Tuesday afternoon.

- Bloomberg