Dynamic evolution mechanism of water-bearing coal permeability and water film under stress

被引：0
|
作者：
Duan S. [1 ]
Li B. [1 ,2 ,3 ]
Cheng Q. [1 ]
Song H. [1 ]
机构：
[1] College of Mining, Guizhou University, Guiyang
[2] National & Local Joint Laboratory of Engineering for Effective Utilization of Regional Mineral Resources from Karst Area, Guizhou University, Guiyang
[3] Guizhou Key Laboratory of Comprehensive Utilization of Non-metallic Mineral Resources, Guiyang
来源：
Meitan Kexue Jishu/Coal Science and Technology (Peking) | 2023年 / 51卷 / 06期
关键词：
coal; dynamic water film; permeability model; pore geometry; slippage effect;
D O I：
10.13199/j.cnki.cst.2022-0493
中图分类号：
学科分类号：
摘要：
To explore coal permeability evolution mechanism under the comprehensive action of multiple factors including stress - adsorption - water and slippage effect, considering the coal deformation induced by stress - adsorption, the expression of water film thickness was corrected to quantitatively characterize the effective pore size, and based on this, the intensity of gas slippage effect of water-bearing coal was further quantified and the permeability model was established under the comprehensive action of multiple factors. Combined with experimental research to verify the reliability of permeability model, and then the evolution mechanism of coal permeability, water film and slippage factors under the comprehensive action of multiple factors was further revealed. The results show that under different water saturation conditions, the permeability decreases sharply first and then tends to flat with the increase of effective stress; under the same effective stress condition, the permeability decreases with the increase of water saturation. The water film thickness changes dynamically under the action of stress - adsorption - water, the water film thickness has a negative correlation with stress and adsorption, but a positive correlation with water saturation; the slippage factor increases gradually with the increase of water saturation, but the increase trend is gentle under low stress condition, and more sharply under high stress condition. In addition, based on the disjoining pressure of gas-liquid-solid surface, the expressions of dynamic water film in square and equilateral triangle under the effect of stress-adsorption were deduced, and the evolution mechanisms of gas permeability, water film and slip coefficient of pores with different geometric shapes are compared and analyzed. Due to the presence of corner holes, the order of water film thickness in pores of different geometric forms is circle > square > equilateral triangle from large to small, the order of permeability is opposite; the slippage factor in circular is larger than that in angular pore, while the slippage factor in square and equilateral triangle pore has little difference. © 2023 China Coal Society. All Rights Reserved.
引用
收藏
页码：91 / 100
页数：9
相关论文
共 29 条
  • [21] MAGGS F A P., The adsorption-swelling of several carbonaceous solids[J], Transactions of the Faraday Society, 42, pp. B284-B288, (1946)
  • [22] MENG Y, LI Z., Triaxial experiments on adsorption deformation and permeability of different sorbing gases in anthracite coal[J], Journal of Natural Gas Science and Engineering, 46, (2017)
  • [23] ZHENG Guiqiang, Experimental and simulation study on the sorption, diffusion and seepage characters in different-ranked coals, (2012)
  • [24] QU Xiaorong, ZHU Yanming, ZHANG Qinghui, Reservoir characteristics and co-exploration and concurrent production analysis of unconventional natural gases in transitional facies coal measures: taking yushe-wuxiang block as an example, Journal of Xi'an Shiyou University(Natural Science Edition), 32, 3, (2017)
  • [25] GUO Hui, WANG Yanbin, ZHANG Chongchong, Et al., Permeability of different rank coals by injecting carbon dioxide[J], Science & Technology Review, 34, 7, (2016)
  • [26] TENG T, WANG J G, GAO F, Et al., Impact of water film evaporation on gas transport property in fractured wet coal seams[J], Transport in Porous Media, 113, 2, (2016)
  • [27] WANG Huanling, XU Weiya, CHAO Zhiming, Et al., Experimental study on slippage effects of gas flow in compact rock[J], Chinese Journal of Geotechnical Engineering, 38, 5, (2016)
  • [28] LI J, CHEN Z, WU K L, Et al., Effect of water saturation on gas slippage in circular and angular pores[J], AIChE Journal, 64, 9, pp. 3529-3541, (2018)
  • [29] RAY S, MISRA D., Laminar fully developed flow through square and equilateral triangular ducts with rounded corners subjected to H1 and H2 boundary conditions[J], International Journal of Thermal Sciences, 49, 9, (2010)
123