Energy Storage Science and Technology ›› 2023, Vol. 12 ›› Issue (9): 2881-2887.doi: 10.19799/j.cnki.2095-4239.2023.0348

• Energy Storage System and Engineering • Previous Articles     Next Articles

Optimization of cushion gas types and injection production parameters for underground hydrogen storage in aquifers

Yongmao HAO1(), Kan REN1, Chuanzhi CUI1(), Zhongwei WU2   

  1. 1.School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, Shandong, China
    2.School of Petroleum Engineering, Yangtze University, Wuhan 430100, Hubei, China
  • Received:2023-05-22 Revised:2023-07-03 Online:2023-09-05 Published:2023-09-16
  • Contact: Chuanzhi CUI E-mail:haoyongmao@163.com;ccz2008@126.com

Abstract:

The advancement of UHS (underground hydrogen storage) technology offers a viable solution to the volatility and intermittent nature of renewable energy. In increasing hydrogen production, the UHS must inject cushion gas to increase formation pressure and inhibit formation water flow. Since studies on cushion gas in the aquifer are limited and qualitative, the mechanism model of the hydrogen storage reservoir is established using a numerical simulation method that considers the effects of cushion gas injection types, different combinations, injection volumes, and injection rates on hydrogen recovery. The results showed that the impact of cushion gas injection on hydrogen recovery in the first injection-production cycle was more obvious, and the methane scheme increased the hydrogen recovery by 18.41%. Carbon dioxide as a cushion gas may have a poor effect because of the methanation reaction. The hydrogen recovery decreases with the increase in molecular weight of cushion gas and increases with the increase in injection amount of cushion gas. Moreover, the injection of cushion gas can increase formation pressure and inhibit formation water flow, reducing the influence of gravity segregation and increasing hydrogen recovery. In the early stage of hydrogen storage, the reasonable injection of cushion gas is crucial for the operation of hydrogen storage.

Key words: hydrogen storage, aquifer, cushion gas, hydrogen recovery

CLC Number: