The Thermal Effect on the Physical Properties and Corresponding Permeability Evolution of the Heat-Treated Sandstones
The complex high temperature and high stress are commonly encountered in the hot dry rock for geothermal energy development; the thermal effect on the rock properties and corresponding thermal-hydromechanical coupling process has attracted much more attentions in the field of the energy. Taking the...
Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2020-01-01
|
| Series: | Geofluids |
| Online Access: | http://dx.doi.org/10.1155/2020/8838325 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832547149941833728 |
|---|---|
| author | Xianshan Liu Weiluo Lu Man Li Nandou Zeng Tao Li |
| author_facet | Xianshan Liu Weiluo Lu Man Li Nandou Zeng Tao Li |
| author_sort | Xianshan Liu |
| collection | DOAJ |
| description | The complex high temperature and high stress are commonly encountered in the hot dry rock for geothermal energy development; the thermal effect on the rock properties and corresponding thermal-hydromechanical coupling process has attracted much more attentions in the field of the energy. Taking the sandstones in Chongqing as a case study, the physical and mechanical experiments of the heat-treated sandstones and corresponding permeability tests under triaxial loading conditions have been widely conducted. It can be seen that the quality, porosity, uniaxial compression strength, and elastic modulus of the heated sandstones vary differently with different heat-treated temperature. As for the permeability tests in the process of gradual failure under triaxial loading conditions, the permeability variation divided by four variation stages is the same as that under room temperature condition, and the initial permeability, minimum permeability, and maximum permeability have been characterized with temperature variation, showing that the permeability variation in a certain temperature range from 400°C to 600°C presents more obvious than that in other temperature ranges. Furthermore, the relationship between the permeability and the crack volumetric strain of the heat-treated sandstones is further analyzed to prove the mechanism of the permeability evolution. In addition, a damage model has been proposed to deeply determine the correlation of the permeability and damage variables, indicating that gradual damage variation has caused obvious cracks to form flow paths and abruptly change the permeability variation, revealing that the damage can describe the permeability evolution of the heat-treated sandstones considering different temperature and loading conditions. |
| format | Article |
| id | doaj-art-622a22a141e74ddcad9fe06a13087024 |
| institution | Kabale University |
| issn | 1468-8115 1468-8123 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geofluids |
| spelling | doaj-art-622a22a141e74ddcad9fe06a130870242025-02-03T06:45:50ZengWileyGeofluids1468-81151468-81232020-01-01202010.1155/2020/88383258838325The Thermal Effect on the Physical Properties and Corresponding Permeability Evolution of the Heat-Treated SandstonesXianshan Liu0Weiluo Lu1Man Li2Nandou Zeng3Tao Li4Key Laboratory of New Technology for Construction of Cities in Mountain Area (Chongqing University), Ministry of Education, Chongqing 400045, ChinaKey Laboratory of New Technology for Construction of Cities in Mountain Area (Chongqing University), Ministry of Education, Chongqing 400045, ChinaKey Laboratory of New Technology for Construction of Cities in Mountain Area (Chongqing University), Ministry of Education, Chongqing 400045, ChinaKey Laboratory of New Technology for Construction of Cities in Mountain Area (Chongqing University), Ministry of Education, Chongqing 400045, ChinaKey Laboratory of New Technology for Construction of Cities in Mountain Area (Chongqing University), Ministry of Education, Chongqing 400045, ChinaThe complex high temperature and high stress are commonly encountered in the hot dry rock for geothermal energy development; the thermal effect on the rock properties and corresponding thermal-hydromechanical coupling process has attracted much more attentions in the field of the energy. Taking the sandstones in Chongqing as a case study, the physical and mechanical experiments of the heat-treated sandstones and corresponding permeability tests under triaxial loading conditions have been widely conducted. It can be seen that the quality, porosity, uniaxial compression strength, and elastic modulus of the heated sandstones vary differently with different heat-treated temperature. As for the permeability tests in the process of gradual failure under triaxial loading conditions, the permeability variation divided by four variation stages is the same as that under room temperature condition, and the initial permeability, minimum permeability, and maximum permeability have been characterized with temperature variation, showing that the permeability variation in a certain temperature range from 400°C to 600°C presents more obvious than that in other temperature ranges. Furthermore, the relationship between the permeability and the crack volumetric strain of the heat-treated sandstones is further analyzed to prove the mechanism of the permeability evolution. In addition, a damage model has been proposed to deeply determine the correlation of the permeability and damage variables, indicating that gradual damage variation has caused obvious cracks to form flow paths and abruptly change the permeability variation, revealing that the damage can describe the permeability evolution of the heat-treated sandstones considering different temperature and loading conditions.http://dx.doi.org/10.1155/2020/8838325 |
| spellingShingle | Xianshan Liu Weiluo Lu Man Li Nandou Zeng Tao Li The Thermal Effect on the Physical Properties and Corresponding Permeability Evolution of the Heat-Treated Sandstones Geofluids |
| title | The Thermal Effect on the Physical Properties and Corresponding Permeability Evolution of the Heat-Treated Sandstones |
| title_full | The Thermal Effect on the Physical Properties and Corresponding Permeability Evolution of the Heat-Treated Sandstones |
| title_fullStr | The Thermal Effect on the Physical Properties and Corresponding Permeability Evolution of the Heat-Treated Sandstones |
| title_full_unstemmed | The Thermal Effect on the Physical Properties and Corresponding Permeability Evolution of the Heat-Treated Sandstones |
| title_short | The Thermal Effect on the Physical Properties and Corresponding Permeability Evolution of the Heat-Treated Sandstones |
| title_sort | thermal effect on the physical properties and corresponding permeability evolution of the heat treated sandstones |
| url | http://dx.doi.org/10.1155/2020/8838325 |
| work_keys_str_mv | AT xianshanliu thethermaleffectonthephysicalpropertiesandcorrespondingpermeabilityevolutionoftheheattreatedsandstones AT weiluolu thethermaleffectonthephysicalpropertiesandcorrespondingpermeabilityevolutionoftheheattreatedsandstones AT manli thethermaleffectonthephysicalpropertiesandcorrespondingpermeabilityevolutionoftheheattreatedsandstones AT nandouzeng thethermaleffectonthephysicalpropertiesandcorrespondingpermeabilityevolutionoftheheattreatedsandstones AT taoli thethermaleffectonthephysicalpropertiesandcorrespondingpermeabilityevolutionoftheheattreatedsandstones AT xianshanliu thermaleffectonthephysicalpropertiesandcorrespondingpermeabilityevolutionoftheheattreatedsandstones AT weiluolu thermaleffectonthephysicalpropertiesandcorrespondingpermeabilityevolutionoftheheattreatedsandstones AT manli thermaleffectonthephysicalpropertiesandcorrespondingpermeabilityevolutionoftheheattreatedsandstones AT nandouzeng thermaleffectonthephysicalpropertiesandcorrespondingpermeabilityevolutionoftheheattreatedsandstones AT taoli thermaleffectonthephysicalpropertiesandcorrespondingpermeabilityevolutionoftheheattreatedsandstones |