With the increasing demand for energy transformation and upgrading,hydrogen energy,with its characteristics of zero pollution,zero carbon emission and no secondary pollution,will become an important part of China's energy system and the main direction of Sinopec's new energy business.China mainly uses high pressure gaseous hydrogen storage,low temperature liquid hydrogen storage and solid alloy hydrogen storage,which is high cost and low efficiency of hydrogen storage.Compared with surface hydrogen storage,underground hydrogen storage is large in scale,low in cost,safer and has a better development prospect.The hybrid hydrogen storage technology has been applied to a certain scale in France and Germany.Pure hydrogen underground storage technology has achieved good application results in the United States,but there is almost no application and research in China.By studying the characteristics of strong fluidity,high leakage risk and strong corrosion of hydrogen,the technical challenges faced by underground hydrogen storage are identified,including the sealing of traps,formation conditions,completion materials,surface technology and so on.This paper analyzes the feasibility of developing underground hydrogen storage technology in China from the aspects of exhausted oil and gas reservoir resources,salt rock resources,gas storage construction and operation management technology.There are many large oil and gas reservoirs in western and central and eastern China,which are rich in depleted oil and gas resources,and have the conditions to carry out underground mixed hydrogen storage experiments and hydrogen energy storage.Salt rock is widely distributed,so it is feasible to store pure hydrogen or hydrogen energy storage in salt cavern.With mature key technology of gas reservoir storage and salt cavern storage construction and operation technology,it is concluded that China has the conditions and technology to develop underground hydrogen storage.
underground hydrogen storagesalt caverndepleted oil and gas reservoirscover layer damagewellbore leakagemineral chemical reactionshydrogen embrittlement
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