Preparation and Application of the Integrative Hydraulic Drilling and Reaming Completely Technology

The effect of gas extraction would be significantly increased by the way of coal section drilling hole diameter expansion. For the existing technical problems and limitating of constructing large diameter borehole directly or using the reaming way of SKP high pressure water jet, and based on heterogeneous crushing mechanism of high pressure water jet, the integrative hydraulic drilling and reaming completely technology is proposed, the system structure of the technology is researched, the main equipments are integrative selected, and the process characteristics and application prospect of the technology are concluded. The results show that the integration technology of the integrative hydraulic drilling and reaming obvious improves the permeability of coal, promotes gas release, realizes continuous drilling between coal and seam and carried out simultaneously with drilling and reaming. It could significantly increase reaming efficiency and adaptability of evil working condition, which has important popularized and applied values.