French engineering, advisory, and project management services company DORIS is working alongside Perenco Brazil, part of Anglo-French oil and gas player Perenco, to bring two offshore platforms that have been offline since 2020 back to life, while employing electrification to cut greenhouse gas (GHG) emissions.
DORIS has confirmed that it is working on the preliminary front-end engineering design (pre-FEED) and advanced FEED phases of the Cherne revitalization and electrification project for two offshore platforms, PCH1 and PCH2 , which had between 15,000 and 18,000 tonnes of topsides commissioned in 1984 and have been offline since 2020. “Beyond the return to production, electrifying these facilities directly addresses a core challenge: optimizing the energy footprint of mature fields. A complex brownfield project, and a concrete expression of one of our core convictions at DORIS: transforming existing assets is one of the most tangible ways to make conventional energies cleaner,” emphasized the French firm. The company elaborates that its teams are supporting Perenco from concept through detailed engineering as Cherne enters a new chapter, in collaboration with DORIS MMC. Perenco shed light on a $250 million redevelopment program in September 2025 to reactivate and revitalize the mothballed PCH-1 and PCH-2 platforms in Brazil’s Campos Basin to boost production to 15,000 barrels of oil per day and unlock over 50 million stock tank barrels of reserves.
The announcement came shortly after the company completed the acquisition of the Cherne and Bagre concessions from Petróleo Brasileiro S.A. (Petrobras) in August 2025. The multi-dimensional, two-year reactivation program was designed to be executed in three linked stages with operational safety as the main guideline.
The first step, which is already underway, entails the full integrity revitalization of the PCH-1 and PCH-2 platforms, systems and associated equipment, with workstreams ranging from the replacement or renovation of turbines and the water treatment systems to the modernisation of the metering systems and maintenance or replacement of the upper deck flowlines.
The second phase consists of installing a new 10” pipeline connecting the 27-kilometer distance from PCH1 to the Pargo platform, and from there to the FSO Pargo through the existing export line. As part of the plan to upgrade the water injection system, Perenco will also install a water injection line between the PCH1 and PCH2 units.
The third stage is designed to focus on well interventions and re-entries to enable the resumption of production with 36 wells set to come back on stream, which entails 21 workover campaigns and a further evaluation effort for the best application of gas lift or ESP methods.