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Transport in Porous Media

, Volume 112, Issue 1, pp 117–137 | Cite as

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

  • H. L. WangEmail author
  • W. Y. Xu
  • M. Cai
  • J. Zuo
Article

Abstract

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.

Keywords

Compact rock Gas flow Gas slippage effect Permeability Knudsen number 

Notes

Acknowledgments

The authors gratefully acknowledge the financial supports from China scholarship, Qing Lan Project, the Natural Science Foundation of China (Grant Nos. 11172090, 11272113, 51479049), and the Natural Science Foundation of Jiangsu Province (Grant No. BK2012809).

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Copyright information

© Springer Science+Business Media Dordrecht 2016

Authors and Affiliations

  1. 1.Key Laboratory of Coastal Disaster and Defence, Ministry of EducationHohai UniversityNanjingChina
  2. 2.Department of Civil EngineeringUniversity of TorontoTorontoCanada
  3. 3.Institutes of Geotechnical EngineeringHohai UniversityNanjingChina
  4. 4.Bharti School of EngineeringLaurentian UniversitySudburyCanada

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