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Experiment and prediction of enhanced gas storage capacity in depleted gas reservoirs for clean energy applications

Author

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  • Wang, Qing
  • Zhang, Mengchuan
  • Zhou, Fujian
  • Fei, Hongtao
  • Yu, Sen
  • Su, Hang
  • Liang, Tianbo
  • Chen, Zhangxin

Abstract

Utilizing depleted gas reservoirs for gas storage is the most efficient method. However, the impact of multi-cycle injection-production and water invasion on rock properties and gas-water seepage dynamics remains unclear. This study investigates such reservoirs' multi-cycle stress sensitivity and gas-water displacement behavior. Results show that multi-cycle injection-production and water invasion increase the stress sensitivity of the gas and damage gas storage space and seepage channels. This study also proposed a new unsteady gas-water relative permeability testing method and a prediction model based on in-situ X-ray CT scanning, improving measurement accuracy by 30 %. The results found that the gas's relative permeability is directly proportional to the injection rate and inversely proportional to the initial gas saturation. A gas-water relative permeability model was established, demonstrating that gas-water interference intensifies as the number of cycles increases. In a gas-water transition zone in depleted gas reservoirs, gas relative permeability damage reaches 81 %, reducing the movable pore space and impacting injection-production rates and capacity. This study offers valuable recommendations for optimizing production and dynamic prediction in depleted gas reservoirs, contributing to clean energy applications.

Suggested Citation

  • Wang, Qing & Zhang, Mengchuan & Zhou, Fujian & Fei, Hongtao & Yu, Sen & Su, Hang & Liang, Tianbo & Chen, Zhangxin, 2024. "Experiment and prediction of enhanced gas storage capacity in depleted gas reservoirs for clean energy applications," Renewable Energy, Elsevier, vol. 237(PC).
    • Handle: RePEc:eee:renene:v:237:y:2024:i:pc:s0960148124019621
    DOI: 10.1016/j.renene.2024.121894
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