Karoon announced that the PAT-2 well, one of two new production wells drilled into the Patola field in the BM-S-40 production license in Brazil (Karoon 100%), came onstream on 15 March 2023 at a rate of 12,000 14,000 bopd. This followed the installation of a subsea flowline and umbilical connecting the well to the Cidade de Itajaí FPSO and the completion of well and infrastructure commissioning activities. Production from the second well, PAT-1, is expected to commence by the end of March 2023.

After an initial period of flush production, likely to last a few days, output from the two Patola wells is expected to stabilise at approximately 10,000 to 15,000 bopd, taking total production from BM-S-40 to more than 30,000 bopd, prior to natural decline commencing. Depending on the reservoir and aquifer response, one of the two production wells may be switched to water injection in the future, while any associated gas production from Patola will be reinjected into the Baúna reservoir through the SPS-89 gas injection well. The Patola field was discovered in 2011 by Petrobras with the SPS-91 exploration well, which encountered 38 degrees API oil in the same Oligocene turbidite sandstones found in nearby Baúna and Piracaba, with similar petrophysical properties.

The field lies in a water depth of approximately 280 metres. In June 2021, eight months after acquiring the BM-S-40 assets from Petrobras, Karoon announced its decision to proceed with the development of Patola. Due to better reservoir quality than expected at both the PAT-1 and PAT-2 well locations, Proven and Probable (2P) Reserves at Patola were upgraded by 1.7 MMbbl to 16.4 MMbbl as at 31 December 2022.