Numerical Study of the Influence of Interlayer Mechanical Properties on Salt Cavern Storage Stability

Abstract:

Numerical and experimental studies including different soft and hard layer thickness were conducted under different pressures for analyzing the effect of interlayers on stability of salt cavern considering shrinkage rate, plastic zone and displacement vectors. The results indicate that: Cavern shrinkage rate is increased appreciably with increased of soft layer thickness and decreased significantly with increased of hard layer thickness. The plastic zone change is not obviously with increased of soft layer thickness but obviously with hard layer and plastic zone are significant differences at layer while cavern including soft layer and hard layer, the soft layer effect on plastic zone is less than hard layer and it is more sensitive to pressure increasing, the fracture of hard layer is more easily than soft layer. Maximum displacements happen at layer while cavern including soft layer and at salt rock while cavern including hard layer. Comprehensive differences effects of soft layer and hard layer to stability of salt cavern storage find that fine hard layer and heavy soft layer are more unfavorable. The results are important to oil-gas storage cavern modeling analysis in laminated salt rock.

• Periodical: Applied Mechanics and Materials (Volume 188)
• Pages: 66-71
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.188.66
• Online since: June 2012
• Authors: Xiao Lan Huang, Chao Yu, Hong Ling Ma
• Keywords: Creep, Layered Salt Rock, Mechanical Property, Numerical Simulation, Stability, Storage

References

[1] E M Dawson, P A. Cundall, Cosserat plasticity for modeling layered rock [A]. In: Proceedings of the ISRM Regional Conference on Fractured and Jointed Rock Masses. Berkeley, California: Lawrence Berkeley Laboratory, 1992. 269-276.

[2] C.H. Yang, Y.P. Li. Expanded Cosserat medium constitutive model for laminated salt rock. Chinese Journal of Rock Mechanics and Engineering, 2005, 24(23): 4226-4232.

[3] Y.P. Li, C.H. Yang. Three-dimensional expanded Cosserat medium constitutive model for laminated salt rock. Chinese Rock and Soil Mechanics, 2006, 27(4): 509-513.

[4] X.Y. Yin, C.H. Yang, Y.P. Li. Program implementation of 3-D expanded constitutive model of Cosserat medium for laminated salt rock. Chinese Rock and Soil Mechanics, 2007, 28(7): 1415- 1420.

[5] X.Y. Yin, C.H. Yang, Y.P. Li. Influence mudstone interlayer on stability of oil storage in laminated salt rock. Chinese Rock and Soil Mechanics, 2006, 27: 344-348.

[6] Y.P. Li, J. Liu, C.H. Yang. Influence of mudstone interlayer on deformation and failure characteristics of salt rock. Chinese Journal of Rock Mechanics and Engineering, 2006，25(12)：2461-2466.

[7] M.M. Tang, Z.Y. Wang , G.S. Ding. Experimental study of full process of strain of rock salt and salt-mudstone interlayer in Huanan salt mine. Chinese Journal of Rock Mechanics and Engineering, 2010, 29(1): 2712-2719.

[8] J. Liu. Experimental investigation and theoretic analysis on the mechanical properties of layered rock salt. Wuhan: Institute of Rock and Soil Mechanics, Chinese Academy of Sciences. (2006).

[9] B.P. Xi, S.G. Xu,Y. L, Zhao et al. Experimental study and theoretic analysis on creep property of rock salt interlayer. Journal of Taiyuan University of Technology, 2006, 37(2): 123-126.

[10] B.P. Xi, Y.S. Zhao, Y.L. Zhao et al. Study on creep property of rock salt with mudstone interlayer. Chinese Journal of Underground Space and Engineering, 2007, 3(1): 23-26.

[11] Y.L. Zhao, Y. Zhang, W. Wan. Mechanical properties of bedded rock salt and creep failure model [J]. Chinese Mineral Engineering Research, 2010, 25(1): 16-20.

[12] S.G. Xu, W.G. Liang, J. Mo et al. Influence of weak mudstone intercalated layer on mechanical properties of laminated salt rock. Chinese Journal of Underground Space and Engineering, 2009, 5(5): 878-883.

[13] X.L. Huang, J. Xiong. Numerical simulation of gas leakage in bedded salt rock storage cavern. Procedia Engineering, 2011, 12, 254–259.

DOI: 10.1016/j.proeng.2011.05.040

[14] B.P. Xi, Y.S. Zhao, Y.L. Zhao et al. Investigation on rheodestruction and permeability of surrounding rock for long-term running storage cavern in bedded rock salt. Chinese Rock and Soil Mechanics, 2008, 29: 241-246.

[15] C.H. Yang. Layered salt rock mechanical theoretic and engineering. Beijing: Science Press, (2009).