煤层渗透率各向异性对钻孔瓦斯抽采的影响

doi:10.16265/j.cnki.issn1003-3033.2017.11.023

中国安全科学学报 ›› 2017, Vol. 27 ›› Issue (11): 132-137.doi: 10.16265/j.cnki.issn1003-3033.2017.11.023

煤层渗透率各向异性对钻孔瓦斯抽采的影响

范超军¹, 李胜^**1,2 教授, 兰天伟^1,2 副教授, 杨振华¹, 罗明坤^1,2, 陶梅^1,2 副教授

1 辽宁工程技术大学矿业学院,辽宁阜新 123000
2 辽宁工程技术大学煤炭资源安全开采与洁净利用工程研究中心,辽宁阜新 123000

收稿日期:2017-08-28 修回日期:2017-10-20 发布日期:2020-10-21
通讯作者: ** 李胜(1976—),男,四川资中人,博士,教授,博士生导师,主要从事矿山压力与矿井动力灾害防治方面的研究。E-mail:lisheng76@139.com。
作者简介:范超军 (1990—),男,四川资中人,博士研究生,主要研究方向为煤矿瓦斯灾害防治、煤层气开发。E-mail:chaojunfan@139.com。
基金资助:
国家重点研发计划(2016YFC0801407-2);国家自然科学基金资助(51674132,51604139);辽宁省自然科学基金资助(2015020614);辽宁省教育厅城市研究院项目(LJCl002)。

Influence of coal permeability anisotropy on in-seam borehole gas extraction

FAN Chaojun¹, LI Sheng^1,2, LAN Tianwei^1,2, YANG Zhenhua¹, LUO Mingkun^1,2, TAO Mei^1,2

1 College of Mining, Liaoning Technical University, Fuxin Liaoning 123000, China
2 Resarch Center of Coal Resources Safe Mining and Clean Utilization, Liaoning Technical University, Fuxin Liaoning 123000, China

Received:2017-08-28 Revised:2017-10-20 Published:2020-10-21

摘要/Abstract

摘要： 为揭示渗透率各向异性对钻孔瓦斯抽采的影响,假设煤层是一种孔隙-裂隙结构的弹性连续介质,构建各向异性渗透率方程;基于多物理场耦合理论,建立考虑气-水两相流的煤层流固耦合模型,结合试验测得的煤层不同方向上的渗透率,模拟确定煤层瓦斯抽采的合理钻孔间距和钻孔布置方向。结果表明:由于渗透率各向异性,在钻孔附近形成椭圆形的压降区域,该区域向煤层边界扩展,逐渐变为鼓形;在模拟工况下,抽采120天内达标的合理钻孔间距应为2.346～2.598 m;钻孔与最大渗透率方向的夹角越大,瓦斯抽采量越大,钻孔布置方向与煤层最大渗透率方向应保持较大夹角。

关键词: 瓦斯抽采, 煤层渗透率, 各向异性, 流固耦合模型, 有效半径, 钻孔方向

Abstract: In order to reveal the influence of permeability anisotropy on coal seam gas extraction, an anisotropic permeability equation was derived after assuming that the coal seam is an elastic continuous medium with pore-fracture structure and a hydraulic-mechanical coupling model considering two-phase flow was built for gas extraction, on the basis of the multiple-field coupling theory. Based on the permeability in different directions of coal seam measured by experiment, both the reasonable drilling spacing and the arrangement direction of coal seam gas extraction were determined by numerical simulations. The results show that a pressure reduction zone with elliptical shape is formed near the borehole due to the permeability anisotropy, and then the pressure reduction zone becomes drum shape with the limitation of coal seam thickness, that when taking 120 days as the deadline for gas extraction, the rational space is 2.346-2.598 m under the condition of simulated working face, that the gas extraction volume increases with the rising of the angle between borehole direction and maximum permeability direction, and that for the sake of increasing the gas extraction, the direction of drilling arrangement should keep a larger angle with the maximum permeability direction of coal seam.

Key words: gas extraction, coal permeability, anisotropy, hydraulic-mechanical coupling model, effective radius, drilling direction

中图分类号:

X936

范超军, 李胜教授, 兰天伟副教授, 杨振华, 罗明坤, 陶梅副教授. 煤层渗透率各向异性对钻孔瓦斯抽采的影响[J]. 中国安全科学学报, 2017, 27(11): 132-137.

FAN Chaojun, LI Sheng, LAN Tianwei, YANG Zhenhua, LUO Mingkun, TAO Mei. Influence of coal permeability anisotropy on in-seam borehole gas extraction[J]. China Safety Science Journal, 2017, 27(11): 132-137.

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煤层渗透率各向异性对钻孔瓦斯抽采的影响

Influence of coal permeability anisotropy on in-seam borehole gas extraction

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