气体压力降低对煤岩变形和渗流的影响机制

doi:10.16265/j.cnki.issn1003-3033.2022.04.019

中国安全科学学报 ›› 2022, Vol. 32 ›› Issue (4): 129-134.doi: 10.16265/j.cnki.issn1003-3033.2022.04.019

气体压力降低对煤岩变形和渗流的影响机制

吴学海¹(), 李波波¹^,²^,³^,^**(), 高政¹, 许江⁴, 付佳乐¹

¹ 贵州大学矿业学院,贵州贵阳 550025
² 贵州大学喀斯特地区优势矿产资源高效利用国家地方联合工程实验室,贵州贵阳 550025
³ 贵州省非金属矿产资源综合利用重点实验室,贵州贵阳 550025
⁴ 重庆大学煤矿灾害动力学与控制国家重点实验室,重庆 400044

收稿日期:2022-01-16 修回日期:2022-03-01 出版日期:2022-04-28 发布日期:2022-10-28
通讯作者: 李波波
作者简介:
吴学海 (1997—),男,贵州织金人,硕士研究生,研究方向为岩石损伤力学与瓦斯渗流。E-mail: 568138241@qq.com。
许江, 教授。
基金资助:
贵州省省级科技计划项目资助(黔科合基础-ZK[2021]重点052); 国家自然科学基金资助(52064007); 国家自然科学基金资助(51804085)

Influence mechanism of gas pressure reduction on coal deformation and seepage

WU Xuehai¹(), LI Bobo¹^,²^,³^,^**(), GAO Zheng¹, XU Jiang⁴, FU Jiale¹

¹ College of Mining, Guizhou University, Guiyang Guizhou 550025, China
² National Joint Engineering Laboratory for the Utilization of Dominant Mineral Resources in Karst Area, Guizhou University, Guiyang Guizhou 550025, China
³ Guizhou Key Laboratory of Comprehensive Utilization of Non-metallic Mineral Resources, Guiyang Guizhou 550025, China
⁴ State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China

Received:2022-01-16 Revised:2022-03-01 Online:2022-04-28 Published:2022-10-28
Contact: LI Bobo

摘要/Abstract

摘要：

为探究瓦斯抽采过程中压力降低引起的煤岩变形和气体渗流行为,基于气体压力降低的渗流试验及三轴压缩试验,得出煤岩变形和渗流变化特性;考虑吸附损伤修正基质收缩变形,构建煤岩渗透率模型,并用试验结果验证模型的合理性。研究结果表明:随气体压力降低,煤岩渗透率呈现出“V”型变化趋势,轴向变形和径向变形线性升高,且通入CO₂的煤岩比通入CH₄的煤岩变形更大,径向变化量是轴向变形量1.89倍;通入CO₂煤岩的弹性模量、峰值主应力差比通入CH₄的有不同程度降低;为保证安全生产,使用CO₂驱替或CO₂致裂增透技术时,应重视CO₂注入煤层后所引起的煤岩强度降低问题。

关键词: 瓦斯抽采, 气体压力降低, 煤岩变形, 基质收缩, 吸附损伤, 渗流试验

Abstract:

In order to study coal deformation and gas seepage behaviors caused by pressure reduction in gas extraction process, based on seepage test and triaxial compression test of gas pressure reduction, coal deformation and seepage characteristics were obtained. Then, matrix shrinkage deformation was modified by considering adsorption damage, and a permeability model was constructed before its rationality was verified by experimental results. The results show that with the decrease of gas pressure, coal permeability presents a "V" shaped change trend. The axial and radial deformation increase linearly, and coals injected with CO₂ produce larger deformation than that with CH₄, with radial deformation being 1.89 times of axial deformation. Moreover, the elastic modulus and peak principal stress difference in coal with CO₂ are lower to different extent than those with CH₄. In order to ensure safe production, attention should be paid to the issue of coal strength reduction caused by CO₂ injection into coal seam when using CO₂ displacement or CO₂ fracturing anti-reflection technology.

Key words: gas extraction, gas pressure reduction, coal deformation, matrix shrinkage, adsorption damage, seepage test

吴学海, 李波波, 高政, 许江, 付佳乐. 气体压力降低对煤岩变形和渗流的影响机制[J]. 中国安全科学学报, 2022, 32(4): 129-134.

WU Xuehai, LI Bobo, GAO Zheng, XU Jiang, FU Jiale. Influence mechanism of gas pressure reduction on coal deformation and seepage[J]. China Safety Science Journal, 2022, 32(4): 129-134.

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参考文献 15

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气体类型	弹性模量 E/MPa	峰值主应力差 Δσ_c/MPa	泊松比 ν
CH₄	853.13	25.80	0.24
CO₂	816.41	23.33	0.24

参数	气体类型
参数	CH₄	CO₂
B	0.876	1.000
k_a/10^-3μm²	0.038	0.036
ε_L	0.084	0.068
p_L/MPa	4.176	4.956
ζ	0.219	0.670

气体压力降低对煤岩变形和渗流的影响机制

Influence mechanism of gas pressure reduction on coal deformation and seepage

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