An Experimental Study on the Slippage Effect of Gas Flow in a Compact Rock

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• 作者：H. L. Wang ; W. Y. Xu ; M. Cai ; J. Zuo
• 关键词：Compact rock ; Gas flow ; Gas slippage effect ; Permeability ; Knudsen number
• 刊名：Transport in Porous Media
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：112
• 期：1
• 页码：117-137
• 全文大小：1,235 KB
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• 作者单位：H. L. Wang (1) (2)
  W. Y. Xu (3)
  M. Cai (4)
  J. Zuo (3)
  
  1. Key Laboratory of Coastal Disaster and Defence, Ministry of Education, Hohai University, Nanjing, 210098, Jiangsu, China
  2. Department of Civil Engineering, University of Toronto, Toronto, M5S 1A4, Canada
  3. Institutes of Geotechnical Engineering, Hohai University, Nanjing, 210098, China
  4. Bharti School of Engineering, Laurentian University, Sudbury, P3E 2C6, Canada
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geotechnical Engineering
  Industrial Chemistry and Chemical Engineering
  Civil Engineering
  Hydrogeology
  Mechanics, Fluids and Thermodynamics
  
• 出版者：Springer Netherlands
• ISSN：1573-1634

文摘

Gas flow in small pore throats in compact rocks is usually affected by the gas slippage effect due to the dense structure and low porosity of the rocks. In this study, permeability and porosity of two granitic gneiss specimens under different pore and confining pressures are measured. Petrographic studies are also performed using X-ray diffraction, optical microscopy, and scanning electron microscopy coupled with an energy-dispersive spectrometer. Test data indicate that the gas flow in the compact rock does not follow Darcy’s law due to the effect of gas slippage, and the measured permeability needs to be corrected by the gas slippage effect. The test results show that the gas slippage effect increases subsequently when the pore pressure is low, which leads to the measured permeability higher than the absolute permeability. The influence of confining pressure on the impact rate of the slippage effect appears to approach an upper limit symptomatically. It is found that a power law describes well the relationship between the absolute permeability and the effective porosity. A correlation of the slippage factor and the absolute permeability is provided. When the confining pressure is high and the pore pressure is low, the flows are slip flow and transitional flow and traditional fluid dynamics N–S equations are not applicable and Knudsen’s diffusion equations should be used.