底板梳状钻孔在碎软煤层瓦斯治理中的应用
投稿时间:2019-04-19  修订日期:2019-04-19  点此下载全文
引用本文:徐书荣,刘 飞,梁道富,代 茂,曹建明.底板梳状钻孔在碎软煤层瓦斯治理中的应用[J].探矿工程(岩土钻掘工程),2019,46(7):45-50.
XU Shurong,LIU Fei,LIANG Daofu,DAI Mao,CAO Jianming. Application of comb type directional drilling inbroken-soft coal seam floor for gas control[J]. Exploration Engineering (Rock & Soil Drilling and Tunneling), 2019,46(7):45-50.
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作者单位E-mail
徐书荣 贵州黔西能源开发有限公司 xsr1658@163.com 
刘 飞 中煤科工集团西安研究院有限公司  
梁道富 贵州黔西能源开发有限公司  
代 茂 贵州黔西能源开发有限公司  
曹建明 中煤科工集团西安研究院有限公司 caojianming@cctegxian.com 
中文摘要:针对碎软煤层顺层钻孔成孔深度浅、成孔率低、存在抽采盲区等突出问题,基于贵州省青龙煤矿煤层及顶底板岩层赋存特征,提出利用底板梳状钻孔进行碎软煤层长距离、区域瓦斯抽采与治理。首先分析了底板梳状钻孔的施工工艺原理及技术优势所在,从布孔层位、分支点位和钻孔间距的选择等方面总结了底板梳状钻孔的设计原则。通过钻进装备的优选、钻进工艺参数和钻具组合的优化,成功穿越破碎煤岩层孔段,并实现了127 mm套管全程护孔下放,在21605底抽巷施工完成了多组底板梳状定向钻孔。瓦斯抽采效果表明:底板梳状定向钻孔瓦斯抽采流量大、浓度高、衰减速度慢,单孔瓦斯抽采浓度60%~85%、抽采纯量08~25 m3/min,实现了碎软煤层瓦斯高效抽采。为碎软煤层矿井区域瓦斯抽采与治理提供了重要的借鉴。
中文关键词:底板梳状钻孔  碎软煤层  瓦斯抽采  瓦斯治理  钻进装备  钻具组合
 
Application of comb type directional drilling inbroken-soft coal seam floor for gas control
Abstract:In view of the problems such as shallow borehole depth, low rates in borehole completion, presence of blind drainage areas in the broken-soft coal seam, it was proposed to use the comb type directional boreholes in the floor for long-distance and regional gas drainage and control in light of the occurrence characteristics of the coal seam, its roof and floor strata in Qinglong Coal Mine, Guizhou Province. Firstly, the construction principle and technical advantages of the comb directional boreholes on the floor were analyzed, and the design principles of the comb directional borehole on the floor were summarized from the selection of borehole target layers, kick-off point and borehole spacing. Through the optimization of drilling equipment, drilling technical parameters and drilling tool combinations, the fractured coal seam and rock along the borehole were drilled through successfully, and the 127mm casing protection boreholes were run in the hole. Several comb directional boreholes were completed in the floor at No. 21605 bottom drainage roadway. The gas drainage effect shows that the gas drainage flow rate is large, the concentration is high, the attenuation rate is slow, the single borehole drainage concentration is 60%~85%, the drainage purity is 0 .8 to 1.5m3/min, achieving high-efficiency gas drainage. The study provides an important reference for regional gas drainage and control in the broken-soft coal seam.
keywords:floor comb borehole  broken-soft coal seam  gas extraction  gas control  drilling equipment  drilling tool combination
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