Research on permeability model of coal reservoir along producing wellbores

Authors

JIA Lidan, College of Mining, Guizhou University, Guiyang 550025, ChinaFollow
ZHANG Lin, College of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China; Key Laboratory of Western Mine Exploitation and Hazard Prevention Ministry of Education, Xi’an University of Science and Technology, Xi’an 710054, China; Western Engineering Research Center of Mine Gas Intelligent Extraction, Xi’an University of Science and Technology, Xi’an 710054, ChinaFollow
LI Bobo, College of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China; Key Laboratory of Western Mine Exploitation and Hazard Prevention Ministry of Education, Xi’an University of Science and Technology, Xi’an 710054, China; Western Engineering Research Center of Mine Gas Intelligent Extraction, Xi’an University of Science and Technology, Xi’an 710054, ChinaFollow
WU Xuehai, College of Mining, Guizhou University, Guiyang 550025, China
GAO Zheng, College of Mining, Guizhou University, Guiyang 550025, China
WANG Zhonghui, College of Mining, Guizhou University, Guiyang 550025, China
FU Jiale, College of Mining, Guizhou University, Guiyang 550025, China

Abstract

Permeability is an important parameter to characterize gas flow. In order to ensure the safe and efficient gas drainage, it is necessary to explore the evolution characteristics of coal reservoir gas seepage at different positions from the producing wellbores. However, the effective stress, the gas adsorption/desorption capacity of coal matrix and the temperature of coal reservoir are constantly changing with the gas drainage, and even the drainage damage may occur, which makes the gas migration behavior in coal seam extremely complicated. In order to explore the seepage characteristics of coal reservoir gas during gas drainage, the space-time evolution function of pore pressure affected by temperature was constructed in the cylindrical coordinate system with consideration to the influence of pressure and temperature fields on the permeability of coal reservoir, and the permeability model of coal reservoir under the action of stress and temperature was established accordingly. The results show that the established model could reasonably describe the evolution law of pore pressure along the producing wellbores and the migration characteristics of gas, that is, the pore pressure at different positions decreases firstly and then changes gently with the increase of drainage time under the condition of constant external stress, while the permeability of coal reservoir decreases at first and then increases. In addition, the calculated permeability of coal reservoir considering the temperature is lower than that at the same position without considering temperature. It is found through discussion that the gas drainage could be enhanced with the increasing of drainage time by setting a reasonable negative pressure drainage mode according to the different effects of fracture compression and matrix contraction on permeability evolution.

Keywords

permeability model, gas drainage, temperature, stress, drainage time

DOI

10.12363/issn.1001-1986.22.03.0213

Recommended Citation

JIA Lidan, ZHANG Lin, LI Bobo, et al. (2022) "Research on permeability model of coal reservoir along producing wellbores," Coal Geology & Exploration: Vol. 50: Iss. 10, Article 4.
DOI: 10.12363/issn.1001-1986.22.03.0213
Available at: https://cge.researchcommons.org/journal/vol50/iss10/4

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