Introduction
Bimonthly, started in 1957
Administrator
Shanxi Provincial Education Department
Sponsor
Taiyuan University of Technology
Publisher
Ed. Office of Journal of TYUT
Editor-in-Chief
SUN Hongbin
ISSN: 1007-9432
CN: 14-1220/N
Administrator
Shanxi Provincial Education Department
Sponsor
Taiyuan University of Technology
Publisher
Ed. Office of Journal of TYUT
Editor-in-Chief
SUN Hongbin
ISSN: 1007-9432
CN: 14-1220/N
location: home > paper >
PDFdownloadsize：8.06MBviewed：download：
Influence of Slippage Effect on the Low Temperature Permeability of Coal Rock Under the Action of Heat Flow Solid Coupling
DOI:
10.16355/j.tyut.1007-9432.20230536
Received:
Accepted:
| Corresponding author | Institute | |
| MENG Qiaorong | College of Mining Engineering, Taiyuan University of Technology |
abstract:
【Purposes】Increasing the permeability of coal reservoirs is a key technology to improve the recovery rate of coalbed methane，and in-situ thermal injection mining is an effective method to enhance coalbed methane production.【Methods】In order to explore the change rule of coal reservoir permeability under the coupling of heat，fluid，and solid，pyrolysis seepage experiments of anthracite with different burial depths and temperatures were conducted，and theoretical analysis and research were conducted on the experimental results.【Findings】The results showed that：1）Under three-dimensional effective stress，the permeability of pyrolysis anthracite varies with temperature and pore pressure in a "V" shape，with a significant rebound phenomenon，which decreases with the increase of burial depth. When the pore pressure is less than the critical pore pressure and the temperature is lower than 70 ℃，the permeability of the coal body mainly depends on the slippage effect. When the pore pressure is greater than the critical pore pressure and the temperature is higher than 70 ℃，the permeability mainly depends on thermal expansion and the opening degree of pore pressure on the fracture，and the impact of thermal stimulation on the permeability is much greater than that of pore pressure. 2）The critical pore pressure is between 1 and 1.5 MPa，the influence of slippage effect on permeability gradually decreases with the increase of temperature，and the gradient of influence reduction increases with the increase of burial depth. 3）The fracture opening coefficient increases with the increase of temperature and burial depth，but the higher the temperature，the smaller the change in the sensitivity of permeability to pore pressure under different burial depths.【Conclusions】These research results further enrich the theory of in-situ thermal injection mining of coalbed methane，and provide valuable data reference for enhanced permeability of coalbed methane.
Keywords:
permeability； pore pressure； thermal fluid solid coupling； slippage effect； in-situ thermal injection mining； coalbed methane;