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中南大学学报(英文版)

Journal of Central South University

Vol. 26    No. 8    August 2019

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Experimental study on repair characteristics of damaged rock salt of underground gas storage
YIN Hong-wu(尹洪武)1, 2, MA Hong-ling(马洪岭)1, 2, SHI Xi-lin(施锡林)1, 2, LI Hao-ran(李浩然)3, GE Xin-bo(葛鑫博)1, 4, GAO Ang(高昂)5

1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China;
3. Structural Health Monitoring and Control Institute, Shijiazhuang Tiedao University,
Shijiazhuang 050043, China;
4. School of Mining and Safety Engineering, Shandong University of Science and Technology,Qingdao 266590, China;
5. Daqing International Exploration and Development Company, Daqing 163000, China

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.

 

Key words: gas storage; rock salt; permeability; damage; uniaxial compression; self-healing

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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