| 复杂地层梳状定向长钻孔在区域瓦斯治理中的应用 |
| 投稿时间：2021-02-23 修订日期：2021-05-08 点此下载全文 |
| 引用本文：曹建明.复杂地层梳状定向长钻孔在区域瓦斯治理中的应用[J].钻探工程,2021,48(12):20-25.CAO Jianming. Application of comb directional long boreholes to regional gas control in complex formation[J]. Drilling Engineering, 2021,48(12):20-25. |
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| 中文摘要:针对贵州毕节地区某煤矿瓦斯治理预抽时钻孔抽采距离短、成孔性差、孔内事故频发等难题，提出在某煤矿采用底板穿层梳状定向长钻孔的技术方法。通过优化钻孔布孔形式、布孔层位和分支孔施工工艺，保证钻孔主孔成孔深度和分支孔见遇煤层率。试验期间，施工钻孔主孔深度均大于600 m，分支孔见遇煤层率达到60%。钻孔成孔明显得到改善，单孔最大瓦斯抽采浓度达到85%，最大瓦斯抽采纯量达到2.5 m3/min，同时节省了施工成本，为毕节矿区瓦斯治理提供了新的方案。 |
| 中文关键词:定向钻孔 穿层 梳状孔 复合钻进 区域瓦斯治理 煤矿井下 |
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| Application of comb directional long boreholes to regional gas control in complex formation |
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| Abstract:In view of the problems with gas drainage， such as short main holes， poor hole-making， frequent accidents in a coal mine of Bijie， Guizhou， a technique of using cross-floor comb-like directional long boreholes to control gas was put forward. The drilling pattern， drilling horizons and branch hole drilling processes were optimized to ensure the hole depth of the main hole and the coal intersection rate of the branch holes. During the trial， the drilling depth of the main holes was more than 600m， with the coal intersection rate of the branch holes up to 60%. The drilling hole completion quality has been obviously improved with the maximum gas drainage concentration per single hole up to 78%， the maximum gas extraction net volume 2.33m3/min， and less construction costs. It provides a new approach to gas control in the mining area of the Bijie city. |
| keywords:directional drilling bed crossing comb hole compound drilling regional gas control underground coal mine |
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