Experimental Investigation on Permeability Evolution of Dolomite Caprock under Triaxial Compression

Deng Xu, Jianfeng Liu, Zhide Wu, Lu Wang, Hejuan Liu, Fukun Xiao, Yin Zeng and Cheng Lyu
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Deng Xu: State Key Laboratory of Hydraulic and Mountain River Engineering, Sichuan University, Chengdu 610065, China
Jianfeng Liu: State Key Laboratory of Hydraulic and Mountain River Engineering, Sichuan University, Chengdu 610065, China
Zhide Wu: CNPC Key Laboratory of Oil and Gas Underground Storage Engineering, Langfang 065007, China
Lu Wang: State Key Laboratory of Hydraulic and Mountain River Engineering, Sichuan University, Chengdu 610065, China
Hejuan Liu: State Key Experiments in Geotechnical Mechanics and Engineering, Chinese Academy of Sciences, Institute of Rock and Soil Mechanics, Wuhan 430071, China
Fukun Xiao: Heilongjiang Ground Pressure & Gas Control in Deep Mining Key Laboratory, Heilongjiang University of Science and Technology, Harbin 150022, China
Yin Zeng: State Key Laboratory of Hydraulic and Mountain River Engineering, Sichuan University, Chengdu 610065, China
Cheng Lyu: State Key Laboratory of Hydraulic and Mountain River Engineering, Sichuan University, Chengdu 610065, China

Energies, 2020, vol. 13, issue 24, 1-12

Abstract: In order to study the influence of different confining pressures on the stability and airtightness of dolomite underground gas storage, a permeability test under hydrostatic confining pressure, conventional triaxial compression test and gas–solid coupling test under triaxial compression were carried out on MTS815 test machine. During the tests, an acoustic emission (AE) monitoring system was also employed to estimate the rock damage. The experimental results showed that the relationships between permeability, porosity and hydrostatic confining pressure were exponential function and power function, respectively. Increasing confining pressure reduced the porosity and permeability of dolomite, and increased its triaxial compressive strength, but the addition of nitrogen reduced the compressive strength of dolomite by 10~30%, the higher the confining pressure, the smaller the difference. Compared with the maximum permeability under 15 MPa, confining pressure in the gas–solid coupling experiment, the maximum permeability under confining pressure of 30, 45, and 60 MPa is reduced by 42.0%, 84.4%, and 97.9%, respectively. In addition, the AE activity of dolomite decreases significantly with the increase in confining pressure, which also delayed the arrival of the AE active period.

Keywords: dolomite; confining pressure effect; permeability characteristics; acoustic emission (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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