中国安全科学学报 ›› 2018, Vol. 28 ›› Issue (12): 109-115.doi: 10.16265/j.cnki.issn1003-3033.2018.12.018

• 安全工程技术科学 • 上一篇    下一篇

煤岩渗透率各向异性模型及瓦斯抽采模拟研究

张浩浩1, 李胜1,2 教授, 范超军1, 王箫鹤1, 郭云峰1, 陶梅1 副教授   

  1. 1 辽宁工程技术大学 矿业学院,辽宁 阜新 123000
    2 煤炭资源与安全开采国家重点实验室,江苏 徐州 221116
  • 收稿日期:2018-09-07 修回日期:2018-11-10 发布日期:2020-11-25
  • 作者简介:张浩浩 (1993—),男,山西泽州人,硕士研究生,研究方向为煤矿瓦斯灾害防治、煤层气开发研究。E-mail:zhanghh_1993@163.com。
  • 基金资助:
    国家自然科学基金资助(51674132);国家重点研发计划项目(2016YFC0801407-2);辽宁省教育厅城市研究院项目(LJCl002)。

Study on model for coal rock permeability anisotropy and simulation of gas extraction

ZHANG Haohao1, LI Sheng1,2, FAN Chaojun1, WANG Xiaohe1, GUO Yunfeng1, TAO Mei1   

  1. 1 College of Mining Engineering, Liaoning Technical University, Fuxin Liaoning 123000, China
    2 State Key Laboratory of Coal Resources and Safe Mining, Xuzhou Jiangsu 221116, China
  • Received:2018-09-07 Revised:2018-11-10 Published:2020-11-25

摘要: 为进一步明晰煤岩渗透率演化特征和基质瓦斯渗流对瓦斯抽采的影响,基于已有的基质瓦斯渗流流固耦合模型,考虑煤岩渗透率的各向异性特征,建立煤岩渗透率各向异性耦合模型;运用COMSOL Multiphysics软件,分析煤岩渗透率各向异性特征和基质瓦斯渗流对瓦斯抽采的影响。研究结果表明:随着渗透率各向异性系数的增大,基质与裂隙渗透率比例系数降低,瓦斯抽采效果明显降低;基质瓦斯渗流量比重最大值随各向异性系数的增大而增大,但在抽采中后期渗流量比重逐渐趋于稳定,且稳定在0.1%左右;基质瓦斯渗流项在瓦斯抽采中某一特定阶段有促进作用。

关键词: 瓦斯抽采, 渗透率各向异性, 流固耦合, 基质瓦斯渗流, 渗透率演化特征

Abstract: In order to further clarify coal rock permeability evolution law and influence of matrix gas seepage on gas extraction, based on the existing fluid-solid coupling model of matrix gas seepage, considering anisotropic characteristics of coal permeability, a permeability anisotropy coupling model of coal rock was built. COMSOL Multiphysics software was used to analyze the anisotropic permeability characteristics of coal rock and the influence of matrix gas seepage on gas extraction. The results show that with the increase of permeability anisotropy coefficient, the ratio coefficient of matrix to fracture permeability decreases, and the effect of gas extraction is obviously reduced, that the peak value of matrix gas seepage rate increases with the increase of anisotropy coefficient, but matrix gas seepage rate in the middle and late stages of gas extraction is gradually stable, and the value is about 0.1%, and that the matrix gas seepage term plays a promoting part at a certain stage in gas extraction.

Key words: gas extraction, permeability anisotropy, fluid-solid coupling, matrix gas seepage, permeability evolution characteristics

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