煤矿安全2012，Vol.43Issue(7)：63-65,3.
松软煤层中风压空气钻进技术与装备
Medium Wind Pressure Air Drilling Technique and Equipments in Soft Coal Seam
摘要
Abstract
It is difficult to drill bedding long borehole for gas extraction in soft coal seam. The available drilling technology and equip- ments with the problems of shallow borehole depth and lower hole - forming ratio can＇t meet the demand of gas efficient extraction. Therefore, the medium wind pressure air drilling technique for soft coal seam was developed, which included compound exhausting slag technique with compressed air and helix drilling rod, multistage dust collection technique and protecting hole technique with screen lin- er. The application results showed that the average borehole depth generally increased by one time, the drilling efficiency was enhanced about 35 percent, and the hole -forming ratio reached 70% after using pressure air drilling technology and equipment under the same construction conditions, which provided a reliable technology and equipment support for the construction of gas extraction borehole in soft coal seam.关键词
松软煤层/中风压/空气钻进/成孔深度Key words
soft coal seam/medium wind pressure/air drilling/borehole depth分类
矿业与冶金引用本文复制引用
殷新胜,刘建林,冀前辉..松软煤层中风压空气钻进技术与装备[J].煤矿安全,2012,43(7):63-65,3.基金项目
科研院所技术开发研究专项资助项目 （）
