Oil and gas tanks are the cheapest options for underground hydrogen storage – pv magazine International

New research from Ireland shows depleted oil and gas reservoirs can be used to store hydrogen at a price of $1.29/kg. According to the researchers, underground hydrogen storage could benefit from the technological maturity of geological storage of natural gas and CO2, combined with decades of established knowledge.

A group of scientists led by the Dublin City University in Ireland analyzed the prospects for clandestinely hydrogen storage (UHS) in geology formations in a comprehensive review and found that depleted oil and gas tanks are the cheapest options.

In addition to oil and gas reservoirs, technical-economic analyzes considered the storage of hydrogen in aquifers, porous rocks and salt caves. “It should be mentioned that salt caves do not exist naturally,” he explained. “Instead, they are man-made cavities in underground salt formations, which are created by the controlled dissolution of rock salt by injecting water during the solution mining process.”

All these geological formations training can provide a series of safety benefits such as good gas tightness, high the wall sealing thicknesses, and great underground depths. “It should be noted that UHS can benefit from the technological maturity of geological storage of natural gas and CO2, which is associated with decades of established knowledge,” the researchers noted. “However, H2 is invariably more chemically, biologically, and microbially reactive, which presents unique challenges that have yet to be fully understood.”

Additionally, compared to conventional natural gas storage, UHS has leakage problems, due to viscosity, the size of the molecule of hydrogen, and lower density, which requires more pressure and in turn affects storage capacity.

Illustrations of viable geological formations and schematic representations for hydrogen storage.

Image: Sustainable Energy Fuels, Creative Commons CC BY 3.0 license

The analyzes showed that the cost of UHS depend on transport, monitoring, storage and injection cost, as well as location and cleangeological storage site links. Capital costs included gas compression, transformer installation, piping, transformer installation, drilling a new well, and installing wellhead equipment.

The researchers found that depleted oil and gas tanks are the cheapest storage option with a cost of $1.29/kg, while rock caves offer the highest discounted storage cost of $2.77/kg. Capital expenditures for gas and oil reservoirs were also the lowest at $0.73/kg and salt caverns had the highest capital expenditures at $1.51/kg. The academics pointed out that operating expenses were also lower ($0.11/kg) compared to salt caverns ($0.14/kg), noting that depleted natural gas tanks have a lower construction cost when compared with impoverished oil reservoirs.

They presented their findings in the article “Perspectives and perspectives from the basement hydrogen storage and natural hydrogen,” Posted in Sustainable energy fuels. “Despite the paucity of economic data on natural hydrogen projects, he it is expected that the overall economics of its extraction will not be be too different from natural gas,” they concluded. “Nevertheless, it requires additional substantiation Going through sound technical and economic analyses.

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Bonny J. Streater