Abstract: With the enlargement of the mining depth and scale of Yuwu coal mine, goaf gas emission has become the main factor of restricting its high yield and efficiency. Based on the phenomenon of current drilling machine which hole depth is not enough and time of gas drainage is short, VLD-1000m directional drilling machine of Australia has been introduced in recent years. A new goaf drainage technology of high level fracture boreholes using this drilling machine has been put forward. The analysis results show that this technology has more advantages than current drilling technology, which are mainly reflected in that the effect of gas drainage is good and the capability of positioning is strong, and which need very small quantities of drill sites and cost. So this technology can govern the problem effectively of goaf gas emission, and has a broad application prospect.

Key words: VLD-1000m directional drilling machine, gas drainage, goaf, high level fracture boreholes