Journal Published Online: 17 December 2020
Volume 49, Issue 3

An Experimental Study on Physical, Mechanical, and CO Permeability Behavior of Sandstone after High-Temperature Treatment

CODEN: JTEVAB

Abstract

In order to investigate the influence of temperature and complex stress state on the physical, mechanical, and CO2 permeability behavior of sandstone, the Brazilian splitting test, uniaxial compression test, and permeability test were carried out under different cooling modes after high-temperature heat treatment (100°C, 200°C, 300°C, 400°C, 500°C, 600°C, 700°C, 800°C, and 900°C). The changes of the physical parameters of the specimens before and after high-temperature treatment were compared. The variation law of mechanical behavior under different temperatures and cooling modes was investigated. The variation law of CO2 permeability in two cooling modes under different confining pressure and osmotic pressure was analyzed. The experimental results show that the sandstone specimen increases in volume while the mass and density decrease with the increase of temperature. The specimens show brittle failure after peak stress in the range of all the tested temperature, and with the increase of temperature, the tensile strength, compressive strength, and elastic modulus decrease in the range of 200°C and below, then increase from 200°C to 400°C, and finally decrease after 400°C. At a certain temperature, the permeability decreases as the confining pressure increases. In two different cooling modes, it was found that after rapid cooling, the specimens had higher CO2 permeability than those that underwent normal cooling. Moreover, these findings are further discussed in the scanning electron microscopy analysis. The physical, mechanical, and CO2 permeability behavior are closely related to the development of internal cracks in sandstone as the temperature increases.

Author Information

Yang, Sheng-Qi
State Key Laboratory for Geomechanics and Deep Underground Engineering, School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou, PR China
Dong, Zhi-Jin
State Key Laboratory for Geomechanics and Deep Underground Engineering, School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou, PR China
Huang, Yan-Hua
State Key Laboratory for Geomechanics and Deep Underground Engineering, School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou, PR China
Teng, Shang-Yong
State Key Laboratory for Geomechanics and Deep Underground Engineering, School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou, PR China
Pages: 21
Price: $25.00
Related
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Details
Stock #: JTE20190915
ISSN: 0090-3973
DOI: 10.1520/JTE20190915