The latest progress in the directional drilling system and its various applications including in-seam methane drainage, gob gas drainage, coal mine methane commercial recovery, etc. are presented.

• 本文介绍了定向钻进系统的最新进展,以及它在许多方面的应用,其中包括煤层内瓦斯抽放,采空区瓦斯抽放,煤层气商业回收等。