A Study and Application of Reverse Power Supply Technology for Drilling Platforms by Production Platforms in the Bohai Oilfield

Abstract This paper presents a reverse power supply technology developed for CNOOC’s Bohai Oilfield to decarbonize drilling operations by leveraging production platform power redundancy. The solution addresses critical technical barriers of voltage/frequency conversion (50/60 Hz) and drilling safety through a compact, ship-classified 5,000kVA integrated transformer-frequency converter unit achieving 40% footprint reduction and SIL-2 emergency response capability. Economic analysis reveals a 50-day break-even threshold for drilling duration. The technology, applicable to over 80% of Bohai assets via both associated-gas turbine and direct shore-power pathways, provides a scalable, replicable model for offshore oil industry decarbonization. Building on this success, Bohai Oilfield is scaling the technology into the Bozhong 19-2 and Jinzhou 25-3 development plans, establishing a replicable paradigm for offshore oil’s low-carbon transformation.