Specific environmental risks from repurposing oil and gas wells

Hydrocarbon wells that have not yet been fully decommissioned can be repurposed and used for the extraction of geothermal energy, storage of hydrogen, thermal or mechanical energy, or CO2. However, it is not yet clear what the potential environmental impacts might be from using these wells for purposes for which they weren't originally intended. For this we need to build on our existing knowledge about the source-pathways-receptors of pollution from oil and gas wells and other technologies in order to understand th...