This paper presents a comprehensive energetic simulation study of a system featuring a Battery Energy Storage System (BESS) with an offshore wind turbine to supply a seawater injection pump for oil and gas (O&G) operations. Water injection into O&G wells is a key technique to maintain reservoir pressure and enhance hydrocarbon recovery. However, the intermittency of wind resources can cause frequent startups and shutdowns of the pumping system, potentially reducing equipment lifespan and system efficiency.

To address this, the inclusion of a BESS mitigates operational disruptions caused by wind variability, increasing water injection continuity and, consequently, improving O&G production. Using five years of hourly wind data from ERA5 reanalysis validated against LiDAR measurements, an algorithm was developed to simulate system operation across various wind turbine and BESS power/energy configurations. The simulation prioritizes continuous pump operation, considering constraints such as the maximum number of annual pump stops and allowable BESS cycles per year.

Results show that, for an 18 MW wind turbine and a 4 MW seawater injection pump, a minimum BESS configuration of 3 MW/6 MWh achieves optimal performance, complying with operational constraints while ensuring high pump utilization. The study demonstrates that proper BESS sizing significantly enhances the operational reliability of offshore wind-powered water injection systems, offering valuable insights for renewable energy integration in offshore O&G applications.