煤矿瓦斯抽采定向长钻孔高效成孔工艺研究

通过对国内外煤矿井下瓦斯钻孔技术现状的分析，介绍一种本煤层近水平定向长钻孔施工装备和技术，并通过实例将本煤层定向长钻孔和本煤层普通直钻孔的瓦斯抽采效果进行对比，得出定向长钻孔的潜在优势。同时，指出我国煤矿井下近水平定向长钻孔施工中普遍存在的影响钻孔钻进效率及深度的问题，为了解决这些问题，提出了一种定向长钻孔施工工艺技术及其关键的开分支技术，最后通过现场试验验证了其有效性。

Research on High Efficient Long Directional Drilling Process for Gas Drainage in Coal mine

Based on current status analysis of underground gas drilling technology of coal mine at home and abroad, the paper introduces the construction equipment and technology of a nearly horizontal directional long drilling for a coal seam. And the effects on gas drainage by the long seam directional drilling and the ordinary drilling for the coal seam are compared with a case, obtaining that the long directional drilling has some potential advantages. Meanwhile, the problems which affect the drilling efficiency and depth in construction of long nearly-horizontal directional drilling in China's coal mines are pointed out. To solve these problems, a long directional drilling technology and the key technique of branch drilling are proposed, and its effectiveness is finally verified through the field tests.