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The influence of water saturation and confining pressure to gas porosity and permeability of sandstone

  • Shiqi Liu
  • Huanling WangEmail author
  • Weiya Xu
  • Zhipeng Xiang
Original Article
  • 75 Downloads

Abstract

Understanding of gas porosity and permeability is important in gas storage, recovery and nuclear waste disposal. In this paper, we focus on the gas porosity and permeability variation of sandstone at different water saturation in loading–unloading cycle. Through an improved method, we prepared the samples with water saturation level from 0 to 81%. The test results suggest that gas effective permeability and porosity are sensitive to confining pressure. This is particularly true in low pressure from 1 to 10 MPa. There is a significant difference between loading and unloading process. This is caused by irreversible deformation of pores and microcracks. The existence of water inside samples leads to a change of permeability on the order of magnitudes from 10−13 to 10−15 m2. Water saturation also influences the sandstone porosity significantly. We observed that the gas relative porosity almost decreases linearly with the increase of water saturation. A simple power law is modified to describe the relationship between gas effective permeability and porosity.

Keywords

Gas effective permeability Porosity Sandstone Water saturation Confining pressure Power law 

Notes

Acknowledgements

This study is financially supported by the National Key R&D Program of China (2017YFC1501100), the National Natural Science Foundation of China (Grant nos. 11771116, 11572110), and the Fundamental Research Funds for the Central Universities (Grant no. 2016B05314).

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Shiqi Liu
    • 1
  • Huanling Wang
    • 1
    • 2
    Email author
  • Weiya Xu
    • 1
  • Zhipeng Xiang
    • 1
  1. 1.Research Institute of Geotechnical EngineeringHohai UniversityNanjingChina
  2. 2.Key Laboratory of Coastal Disaster and Defense, Ministry of EducationHohai UniversityNanjingChina

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