A novel hybrid energy system for hydrogen production and storage in a depleted oil reservoir

Renewable and carbon free energy relates to the sustainable development of human beings while hydrogen production by renewables and hydrogen underground storage ensure the stable and economic renewable energy supply. A hybrid energy system combining hydrogen production by offshore wind power with hydrogen storage in depleted oil reservoirs was constructed along with a mathematical model where the Weibull distribution, Wind turbine power function, Faraday's law, continuity equation, Darcy's law, state equation of real gas, Net Present Value (NPV) and the concept of leveling were adopted to clarify the system characteristics. For the case of a depleted oil field in the Bohai Bay, China, the annual hydrogen production, annual levelized cost of hydrogen and payback period are 2.62 x 10(6)m(3), CNY 34.6/kgH(2) and 7 years, respectively. Sensitivity analysis found that the wind speed impacted significantly on system NPV and LCOH, followed by hydrogen price and stratum pressure. (C) 2020 Published by Elsevier Ltd on behalf of Hydrogen Energy Publications LLC.

Automated summary

This study focuses on a hybrid energy system combining hydrogen production by offshore wind power with hydrogen storage in depleted oil reservoirs, with a case study conducted in a depleted oil field in the Bohai Bay, China. The research found that wind speed has the most significant impact on the economic benefits of the system.