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Experimental study on repair characteristics of damaged rock salt of underground gas storage

储气库损伤盐岩修复特征的试验研究

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  • Renewable energy and system engineering
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Abstract

Damage in rock salt has significant implication on permeability, which affects the tightness of underground salt cavern gas storage in further. During the leaching of a salt cavern, the brine with formation temperature and pressure can promote the self-healing of rock salt in the excavation damage zone (EDZ). Laboratory tests were conducted to study the promoting effect. The permeability of two intact rock salt specimens was tested. Then they were damaged into two kinds of the state respectively through uniaxial compression. After that, they were put in saturated brine (with a temperature of 50 °C and pressure of 12 MPa, which we called the repair environment in this paper) for 7 d. Finally, the permeability and mechanical properties were obtained after the damaged specimens being repaired. The results show that the permeability of intact rock salt is below 10−19 m2; the permeability increases by more than two orders because of damage; the permeability decreases significantly after being repaired, which can be comparable to its intact state. Discussions of the repair mechanisms are presented (especially the mechanism of recrystallization), which may help to provide significant guidance for the study of the tightness and stability of gas storage facilities in China.

摘要

盐岩的损伤会严重影响其渗透特性, 进一步影响储气库的密闭性。在盐穴溶腔过程中, 处于地 层温压状态下的卤水可以促进开挖扰动区内损伤盐岩的自愈合。为了研究这种促进效果, 进行了室内 试验: 首先测试了两个无损试样的渗透率, 然后利用单轴压缩对试样分别进行不同程度的损伤, 接着 将损伤试样置于处于温压状态下(温度50 °C, 压力12 MPa)的饱和卤水(文中将其定义为修复环境)中进 行修复(为期7 d), 最后对修复后的试样进行了渗透率及单轴压缩试验。结果表明: 无损盐岩渗透率小 于10−19 m2; 损伤后的盐岩渗透率增大了两个量级; 修复后的盐岩渗透率明显降低, 与无损试样渗透 率相当。文中对盐岩的修复机理进行了探讨, 尤其分析了盐岩结晶机理, 研究结果对我国储气库的稳 定性和密闭性研究有一定指导意义。

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Authors and Affiliations

  1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, China

    Hong-wu Yin  (尹洪武), Hong-ling Ma  (马洪岭), Xi-lin Shi  (施锡林) & Xin-bo Ge  (葛鑫博)

  2. University of Chinese Academy of Sciences, Beijing, 100049, China

    Hong-wu Yin  (尹洪武), Hong-ling Ma  (马洪岭) & Xi-lin Shi  (施锡林)

  3. Structural Health Monitoring and Control Institute, Shijiazhuang Tiedao University, Shijiazhuang, 050043, China

    Hao-ran Li  (李浩然)

  4. School of Mining and Safety Engineering, Shandong University of Science and Technology, Qingdao, 266590, China

    Xin-bo Ge  (葛鑫博)

  5. Daqing International Exploration and Development Company, Daqing, 163000, China

    Ang Gao  (高昂)

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  1. Hong-wu Yin  (尹洪武)
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Correspondence to Hao-ran Li  (李浩然).

Additional information

Foundation item: Project(201704910741) supported by the China Scholarship Council; Projects(51874274, 51774266, 51874273, 51621006) supported by the National Natural Science Foundation of China; Project(2018YFC0808401) supported by the National Key Research and Development Program of China

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Yin, Hw., Ma, Hl., Shi, Xl. et al. Experimental study on repair characteristics of damaged rock salt of underground gas storage. J. Cent. South Univ. 26, 2185–2196 (2019). https://doi.org/10.1007/s11771-019-4165-9

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  • DOI: https://doi.org/10.1007/s11771-019-4165-9

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