Numerical Simulation of Hydrogen Production from In-Situ Combustion of Gas Reservoirs

Hydrogen is a clean energy and plays an increasingly important role in the energy field. Hydrogen production from natural gas is an important source of hydrogen, but it is also accompanied by carbon emissions. It is beneficial to move the natural gas hydrogen refining site to the underground oil and gas reservoirs that are difficult to develop. The complex reservoir structure of gas reservoir is a challenge to hydrogen production from underground natural gas. In this paper, CMG Stars software is used to simulate methane combustion and in situ hydrogen production reaction in multiple storage media, and explore the influence of geological parameters and injection parameters on hydrogen production efficiency of gas reservoirs. The simulation results show that, the fracture reconstruction area is the main place for hydrogen production reaction, the better hydrogen production efficiency can be obtained when the matrix permeability is less than 0.1 mD, and hydrogen production efficiency can also be improved with the increase of injected oxygen concentration and injection amount. The research results have clarified the reaction space of in-situ hydrogen production from natural gas and the factors affecting the efficiency of underground hydrogen production. It will provide a basic reference for the implementation of this technology..