Petrobras has agreed to acquire a portion of the Argonauta field ring-fence in the Campos Basin from Shell, ONGC, and Brava, consolidating its grip on the Jubarte shared reservoir and bringing its stake in the asset to 98.11%, the Brazilian state-owned oil company said in a statement.

The acquired interest corresponds to the section of the Argonauta field, under the BC-10 concession, that holds a 0.86% share of the pre-salt Jubarte reservoir, linked to a unitisation agreement in force since August 2025.

Total consideration comprises BRL700mn ($142mn) and $150mn, payable in three instalments: BRL100mn at closing, BRL600mn on 15 January 2027 or at closing — whichever is later — and $150mn two years after closing, with all amounts subject to price adjustment provisions.

Upon completion, the federal government's vehicle Pré-Sal Petróleo S.A. (PPSA) will retain a 1.89% interest in the reservoir corresponding to the extension of the field into non-contracted areas, while Petrobras will hold the remainder.

Jubarte is the main asset within Parque das Baleias, a cluster of fields in the northern Campos Basin operating at water depths of between approximately 1,220 and 1,400 metres.

The complex currently produces around 210,000 bpd via the P-57 and P-58 platforms and two FPSOs.

Petrobras said the deal offered attractive financial terms, simplified asset management, and was consistent with its strategic focus on profitable upstream positions.

The transaction remains subject to regulatory clearance from oil regulator ANP and competition authority CADE.

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