Brazilian independent Prio has submitted environmental studies to carry out development drilling at a pair of offshore fields in the prolific Campos basin.

Prio, formerly known as PetroRio before a name change and brand reconfiguration, intends to begin a six-well campaign at the Wahoo pre-salt field early next year.

The company has already agreed to charter the Ocyan semi-submersible rig Norbe VI to run the Wahoo programme.