French engineering, consulting and project management services company DORIS is working alongside Perenco Brasil, part of the Anglo-French oil and gas company Perenco, to restart two offshore platforms that have been mothballed since 2020, while using electricity to reduce greenhouse gas emissions.
DORIS has confirmed that it is working on the preliminary engineering design of the front end (pre-feed) and advanced feed stages of Cherny A project to revitalize and electrify two offshore platforms, PCH1 and PCH2which had between 15,000 and 18,000 tons of topsides, was commissioned in 1984 and has been decommissioned since 2020.
“Besides returning to production, the electrification of these facilities directly addresses a fundamental challenge: improving the energy footprint of mature fields. A complex project, and a tangible expression of one of our core convictions at DORIS: converting existing assets is one of the most tangible ways to make conventional energies cleaner.” The French company confirmed.
The company explains that its teams support Perenco from concept to detailed engineering as Cherne enters a new chapter, in collaboration with DORIS MMC. Perenko highlighted $250 million redevelopment A 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 more than 50 million barrels of tank reserves.
The announcement came shortly after the company complete Acquisition of the Cherne and Bagre concessions from Petróleo Brasileiro SA (Petrobras) in August 2025. The two-year, multi-dimensional revitalization program is designed to be implemented in three linked phases with operational safety as a key guiding principle.
The first step, which is already underway, entails the full safety activation of the PCH-1 and PCH-2 platforms, systems and associated equipment, with workstreams ranging from replacing or refurbishing turbines and water treatment systems to upgrading metering systems and maintaining or replacing flow lines on the upper deck.
The second phase consists of the installation of a new 10-inch pipeline connecting the 27 kilometers from PCH1 to the Pargo platform, and from there to FSO Pargo via the existing export line. As part of the water injection system modernization plan, Perenco will also install a water injection line between the PCH1 and PCH2 units.
Phase III is designed to focus on well interventions and reintroductions to enable production resumption with 36 wells scheduled to return to production, necessitating 21 maintenance campaigns and additional evaluation efforts for the best application of gas lift or electrostatic precipitator methods.
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