含夹矸煤层水力割缝瓦斯抽采技术研究及应用

李晓绅; 刘瑞鹏

doi:10.13272/j.issn.1671-251x.2022100095

含夹矸煤层水力割缝瓦斯抽采技术研究及应用

doi: 10.13272/j.issn.1671-251x.2022100095

李晓绅^1,,
刘瑞鹏²

1.
冀中能源股份有限公司东庞矿, 河北邢台　054000
2.
中国矿业大学(北京) 能源与矿业学院, 北京　100083

基金项目: 国家自然科学基金资助项目(52074296，52004286)。

详细信息

作者简介:
李晓绅（1987—），男，河北邢台人，工程师，硕士，现从事矿井通风与瓦斯治理方面的工作，E-mail：715669897@qq.com

中图分类号: TD72
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- HTML全文浏览量: 72
- PDF下载量: 8
- 被引次数: 0
出版历程
- 收稿日期: 2022-10-31
- 修回日期: 2023-04-18
- 网络出版日期: 2023-04-27

Research and application of hydraulic slotting gas extraction technology in coal seams containing gangue

LI Xiaoshen^1
,,
LIU Ruipeng²

1.
Dongpang Mine, Jizhong Energy Co., Ltd., Xingtai 054000, China
2.
School of Energy and Mining Engineering, China University of Mining and Technology-Beijing, Beijing 100083, China

摘要

摘要: 为研究水力割缝强化瓦斯抽采技术在含夹矸煤层中的应用，通过理论分析得出，与普通钻孔相比，水力割缝钻孔可通过增加煤层渗透率、煤体暴露面积、瓦斯流动通道3个方面强化瓦斯抽采，并建立了考虑孔隙率和渗透率变化的煤层瓦斯流动控制方程。以东庞矿21218工作面为工程背景，采用COMSOL数值模拟软件建立了含夹矸煤层水力割缝瓦斯抽采数值模型，通过对煤层瓦斯流动控制方程进行解算，研究了不同割缝高度、不同钻孔间距条件下，水力割缝瓦斯抽采钻孔的瓦斯压力分布规律，从而确定了上煤层割缝0.3 m、下煤层割缝0.1 m、钻孔间距7.5 m的水力割缝瓦斯抽采钻孔施工参数。基于上述参数，在东庞矿21218工作面现场施工28组、每组7个水力割缝钻孔，对含夹矸煤层瓦斯进行抽采作业，结果表明：与普通钻孔相比，水力割缝钻孔的每百米巷道施工工程量减少了28.51%，瓦斯抽采纯量由11.53 万m³提升至21.43 万m³，增幅为85.86%，巷道掘进期间掘进工作面平均瓦斯体积分数由0.06%降至0.01%，瓦斯抽采效果好，且有效提高了瓦斯抽采效率。
- 瓦斯防治 /
- 瓦斯抽采 /
- 钻孔抽采 /
- 水力割缝 /
- 瓦斯压力分布 /
- 含夹矸煤层
Abstract: In order to study the application of hydraulic slotting enhanced gas extraction technology in coal seams containing gangue, theoretical analysis shows the following points. Compared with ordinary drilling, hydraulic slotting borehole can enhance gas extraction by increasing coal seam permeability, coal body exposure area, and gas flow channels. A coal seam gas flow control equation has been established considering changes in porosity and permeability. Taking the 21218 working face of Dongpang Mine as the engineering background, a numerical model for hydraulic slotting gas extraction in coal seams containing gangue is established by using COMSOL numerical simulation software. By solving the control equation of coal seam gas flow, the gas pressure distribution law of hydraulic slotting gas extraction borehole under different slotting heights and drilling spacing conditions is studied. The construction parameters for hydraulic slotting gas extraction borehole with a slotting of 0.3 m in the upper coal seam, a slotting of 0.1 m in the lower coal seam, and a borehole spacing of 7.5 m are determined. Based on the above parameters, 28 groups of 7 hydraulic slotting borehole are constructed on-site at the 21218 working face of Dongpang Mine to extract gas from coal seams containing gangue. The results show that compared with ordinary borehole, the construction quantity of hydraulic slotting borehole per 100 meters of roadway decreases by 28.51%. The net amount of gas extraction increases from 115300 m³ to 214300 m³ with an increase of 85.86%. The average gas volume fraction of the excavation working face during the roadway excavation period decreases from 0.06% to 0.01%. The gas extraction effect is good and the gas extraction efficiency is effectively improved.
- gas prevention and control /
- gas extraction /
- drilling for gas extraction /
- hydraulic slotting /
- gas pressure distribution /
- coal seam containing gangue

HTML全文

图 1 东庞矿21218工作面布置

Figure 1. Layout of 21218 working face in Dongpang Mine

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图 2 东庞矿21218工作面岩层柱状

Figure 2. Rock stratum histogram of 21218 working face in Dongpang Mine

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图 3 不同抽采钻孔瓦斯流动模型

Figure 3. Gas flow model of different extraction boreholes

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图 4 含夹矸煤层水力割缝瓦斯抽采数值模型

Figure 4. Numerical model for hydraulic slotting gas extraction in coal seams containing gangue

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图 5 瓦斯压力分布

Figure 5. Gas pressure distribution

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图 6 单孔水力割缝钻孔不同割缝高度下瓦斯压力分布剖面

Figure 6. Section of gas pressure distribution at different slotting heights in single-hole hydraulic slotting boreholes

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图 7 多钻孔瓦斯抽采数值模型

Figure 7. Numerical model of porous drillings gas extraction

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图 8 不同钻孔间距下瓦斯压力分布

Figure 8. Gas pressure distribution at different borehole spacing

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图 9 测线监测的瓦斯压力数据

Figure 9. Gas pressure monitoring data of survey line

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图 10 水力割缝钻孔布置剖面

Figure 10. Hydraulic slotting boreholes layout section

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图 11 普通钻孔布置剖面

Figure 11. Ordinary boreholes layout section

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表 1 数值模型计算参数

Table 1. Calculation parameters of the numerical model

参数	数值	参数	数值
初始地应力/MPa	15.50	初始瓦斯压力/MPa	1.15
夹矸弹性模量/GPa	3.45	吸附常数a/（m³·kg⁻¹）	24
夹矸泊松比	0.29	吸附常数b/MPa⁻¹	1
夹矸黏聚力/MPa	4.63	煤的灰分/%	4.38
夹矸内摩擦角/（°）	27	煤的水分/%	1.85
夹矸密度/（kg·m⁻³）	2 530	瓦斯分子量/（g·mol⁻¹）	16
煤层弹性模量/GPa	2.35	气体常数/（J·mol⁻¹·K⁻¹)	8.314
煤层泊松比	0.25	煤层温度/K	293
煤层黏聚力/MPa	2.97	初始渗透率/m²	1.14×10⁻⁸
煤层内摩擦角/（°）	28	瓦斯动力黏度/（Pa·s）	1.84×10⁻⁵
煤层密度/（kg·m⁻³）	1 430	初始孔隙率	0.06

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表 2 普通钻孔和水力割缝钻孔瓦斯抽采效果对比

Table 2. Comparison of gas extraction effects between ordinary boreholes and hydraulic slotting boreholes

指标	普通钻孔	水力割缝钻孔
覆盖巷道长度/m	206	202
工程量/m	10 299	7 220
抽采纯量/万m³	11.53	21.43
掘进工作面平均瓦斯体积分数/%	0.06	0.01

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