Africa-focused oil producer Tullow Oil said on April 8 it would have to lower its production outlook due to a technical fault that has forced a longer-than-planned shutdown at its Jubilee oil field off Ghana.

A damaged turret bearing means a scheduled maintenance shutdown will take another two weeks and production flows will take even more time to ramp-up, Tullow said.

“Tullow’s production guidance will be re-issued once the new operating arrangements have stabilized,” the company said.

Shares in Tullow were down 3% at 0820 GMT.

Analysts at Stifel estimate the two-week production cut would reduce full-year output by around 1,000-1,500 barrels per day net to Tullow, meaning an impact of more than $10 million on operating cash flow.

Tullow said the issue would not have a material impact on its revenue nor on its TEN oilfields, due to start operating this summer.

The company said it was now using a 250,000-barrel shuttle tanker and a 1-million-barrel storage tanker to assure safe production.