Study of the relationship between surface subsidence and internal pressure in salt caverns
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- 作者：Mengyao Li ; Haipeng Zhang ; Wei Xing ; Zhengmeng Hou…
- 关键词：Salt storage cavern ; Equivalent internal pressure ; Surface subsidence ; Analytical solution ; Numerical solution
- 刊名：Environmental Earth Sciences
- 出版年：2015
- 出版时间：June 2015
- 年：2015
- 卷：73
- 期：11
- 页码：6899-6910
- 全文大小：2,126 KB
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Lux KH, Düsterloh U, Hou Z (2002a) Erh?hung der Wirtschaftlichkeit von Spei - 作者单位：Mengyao Li (1)
Haipeng Zhang (1)
Wei Xing (1) (2)
Zhengmeng Hou (1) (2) (3)
Patrick Were (2)
1. Sino-German Energy Research Center, Sichuan University, Chengdu, 610065, China
2. Energy Research Center of Lower Saxony (EFZN), Clausthal University of Technology, 38640, Goslar, Germany
3. Institute of Petroleum Engineering, Clausthal University of Technology, 38678, Clausthal-Zellerfeld, Germany - 刊物类别：Earth and Environmental Science
- 刊物主题：None Assigned
- 出版者：Springer Berlin Heidelberg
- ISSN：1866-6299
文摘
Because of the ultra-low permeability and favorable rheological properties of rock salt, salt caverns are globally considered to be an ideal medium for energy storage. The prediction and control of surface subsidence above storage caverns are the key problems that require steady attention to ensure their long-term safety and stable operation. For salt caverns already in existence factors such as depth, shape and geological conditions cannot be changed. Therefore, the operating condition (i.e., internal pressure) becomes a key factor in influencing surface subsidence. However, cyclic pressure change during the operation phase has not been seriously considered by analytical investigation yet. In this paper, theoretical models for the volume convergence rates in spherical and cylindrical caverns have been derived, thereby developing a new concept “equivalent internal pressure-that of rock salt is considered also takes cyclic internal pressure into consideration. The analytic solution for surface subsidence was then derived from a combination of transfer and distribution functions. Analytical and numerical solutions for different conditions were compared and verified, while the FDM code, FLAC3D, was used for numerical simulations. This comparison reveals that the use of “equivalent internal pressure-is suitable for predicting surface subsidence in the long-term cyclic operation conditions.