Phase two of the scheme, where the first phase kicked off three years ago, aims to tap around 190 million barrels of oil from the Kakocha, Bavuca and Mondo South subsea satellite fields.

The first field to be brought on stream is Mondo South, which is being exploited as a subsea tieback to the Mondo floating production, storage and offloading vessel.

The remaining pair of satellites, tied back to the Kizomba B FPSO, are due to start producing in the coming months, operator ExxonMobil said.