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Standard
| NB/T 11471-2023 Technical specification for high level directional long drilling in roof for gasextraction in coal mining face (English Version) |
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Detail of NB/T 11471-2023
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Introduction of NB/T 11471-2023
本文件规定了煤层顶板高位定向长钻孔瓦斯抽采技术的术语和定义、钻孔轨迹与结构、钻孔设计要求、成孔技术、大曲率定向钻进主动防塌工艺、复杂顶板局部孔段扩孔堵工艺、长钻孔筛管完孔工艺和安全技术措施。
本文件适用于采煤工作面瓦斯抽采顶板高位定向长钻孔施工相关作业。
Contents of NB/T 11471-2023