Tullow declared force majeure on two cargoes of Ghana's Jubilee crude oil after an issue on the Floating Production Storage and Offloading (FPSO) facility that exports the oil.
"We have deferred two liftings at Jubilee while we implement new operating procedures for off-take from the FPSO," the company said in a statement.
The issue comes just before a two-week planned maintenance on the FPSO due to begin on March 20. Oil and gas production will continue until the planned shutdown begins, and the company said it will begin exports again towards the end of the shutdown and issue a new loading schedule near the end of the month.
Tullow said the maintenance would not impact its 2016 production guidance.