水力切槽钻孔瓦斯涌出特征及渗透率反演分析*

doi:10.16265/j.cnki.issn 1003-3033.2021.07.015

中国安全科学学报 ›› 2021, Vol. 31 ›› Issue (7): 105-112.doi: 10.16265/j.cnki.issn 1003-3033.2021.07.015

水力切槽钻孔瓦斯涌出特征及渗透率反演分析^*

韩雷¹ , 沈春明^2,3 副研究员, 王维华³ 助理研究员

1 天地科技股份有限公司开采设计事业部,北京 100013;
2 北京城市系统工程研究中心,北京 100035;
3 煤炭科学技术研究院有限公司安全分院,北京 100013

收稿日期:2021-04-05 修回日期:2021-06-08 出版日期:2021-07-28 发布日期:2022-01-28
通讯作者: ** 沈春明(1985—),男,江苏徐州人,博士,副研究员,主要从事矿井瓦斯防治与公共安全方面的工作。E-mail: Chunming_Shen@126.com。
作者简介:韩雷 (1987—),男,吉林长春人,本科,助理工程师,主要从事采矿工程与矿井灾害治理方面的研究与工程实践方面的工作。E-mail: hanleicaikuang@163.com。
基金资助:
国家自然科学基金资助(51704163);国家科技重大专项项目(2016ZX05067-004-002)。

Analysis on gas emission characteristics and permeability inversion of hydraulic slotting borehole

HAN Lei¹, SHEN Chunming^2,3, WANG Weihua³

1 Department of Mining and Design,Tiandi Science and Technology Company Limited, Beijing 100013,China;
2 Beijing Research Center of Urban System Engineering, Beijing 100035,China;
3 Mine Safety Branch,China Coal Research Institute,Beijing 100013,China

Received:2021-04-05 Revised:2021-06-08 Online:2021-07-28 Published:2022-01-28

摘要/Abstract

摘要： 为探究水力切槽对钻孔瓦斯抽采的影响,基于钻孔瓦斯渗流与切槽增渗机制理论分析,设计井下现场试验,考察切槽钻孔瓦斯涌出速度、累计涌出量及其周围瓦斯压力变化特征,并根据瓦斯涌出速度反演讨论水力切槽煤体渗透率变化过程及其影响因素。结果表明:受切槽周围应力演化、煤体力学行为以及煤层压力水等因素影响,切槽钻孔瓦斯涌出速度总体上呈快速衰减、缓慢衰减、小幅度升高再衰减、大幅度升高4个阶段变化,在切槽作业约40天后,钻孔瓦斯涌出速度开始大幅升高;切槽孔周围瓦斯压力下降率总体上呈远离切槽孔而减小的趋势,切槽煤体渗透率呈先降低后小幅升高再大幅升高的变化趋势,渗透率与周围煤层瓦斯压力呈负相关性,反演分析结果与现有模拟结论相一致。

关键词: 水力切槽, 钻孔瓦斯涌出, 煤体渗透率, 瓦斯抽采, 切槽增渗

Abstract: In order to study influence of hydraulic slotting on borehole gas drainage, underground field test was designed based on theoretical analysis of borehole gas seepage and slotting increasing permeability mechanism, meanwhile,gas emission velocity, cumulative emission and variation characteristics of gas pressure around slotting borehole were investigated. According to gas emission velocity inversion, change process of coal permeability and its influencing factors were discussed and analyzed. The results show that gas emission rate of slotted borehole generally presents four stages of rapid attenuation, including slow attenuation, small amplitude increase and then attenuation, and large amplitude increase, which are related to the stress evolution around slotting, coal mechanical behavior, coal seam pressure water and other factors. After about 40 days of slotting operation, gas emission rate of borehole begin to increase significantly, and gas pressures around slotted borehole decrease. In general, decline rate decreases far away from slotted borehole. Permeability of slotted coal mass shows changing trend that first decreases, then increases slightly, and then increases greatly. Permeability has a negative correlation with gas pressure of surrounding coal seam. Inversion analysis results are consistent with existing simulation conclusions.

Key words: hydraulic slotting, gas emission from borehole, coal permeability, gas drainage, slotting increasing permeability

中图分类号:

X936

韩雷 , 沈春明, 王维华. 水力切槽钻孔瓦斯涌出特征及渗透率反演分析^*[J]. 中国安全科学学报, 2021, 31(7): 105-112.

HAN Lei, SHEN Chunming, WANG Weihua. Analysis on gas emission characteristics and permeability inversion of hydraulic slotting borehole[J]. China Safety Science Journal, 2021, 31(7): 105-112.

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水力切槽钻孔瓦斯涌出特征及渗透率反演分析^*

Analysis on gas emission characteristics and permeability inversion of hydraulic slotting borehole

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