淮南矿区软煤气动定向钻进技术与装备研究及应用

针对淮南矿区利用顺层定向钻孔对工作面和邻近巷道条带煤层瓦斯消突(简称“一孔两消”)的需求，提出了利用气动定向长钻孔实现“一孔两消”的技术思路。在前期气动螺杆定向钻进工艺试验基础上，开发了一款宽度仅为1.1 m、主轴倾角可在±90°范围内无级调整、具备50 m最大遥控距离的窄体全断面遥控定向钻机；优选了杆体直径73 mm、螺旋翼片外径82 mm的?73/82 mm螺旋气动螺杆钻具，最大转矩可达256 N·m；研制了集除尘系统、压风监测系统和油雾润滑系统为一体的多功能除尘车；改进了电磁波随钻测量系统供电电池，提高了系统使用时间和稳定性；开发了碎软煤层双动力复合强排渣技术和定向钻孔长距离筛管完孔技术。利用成套装备与技术在淮南矿区潘三煤矿1682(1)运输巷开展软煤气动定向钻进技术与装备的试验，先后完成16个孔深为240 m以上钻孔，试验总进尺4 548 m，煤层钻遇率达93.1%，所有定向孔全程下筛管，最大钻孔深度423 m。试验过程中即开始连抽，统计期间，抽采平均浓度(体积分数)60%，最大达到81%，抽采混合量基本维持在1.5 m3/min，平均抽采纯量0.9 m3/min，最大抽采纯量...

Air-driven directional drilling technology and equipment in soft coal seam of Huainan mining area

Aiming at Huainan mining area using bedding directional drilling to eliminate gas outburst in strip coal seams of working face and adjacent roadways, we put forward a technical idea of using pneumatic long directional drilling hole to eliminate gas outburst by one hole. On the basis of the previous pneumatic screw directional drilling technology test, we developed a narrow-body full-section remote directional drilling rig with a width of only 1.1 m, the spindle angle can be stepless adjusted from ?90° to 90°, and maximum remote distance of 50 m. The ?73/82 mm screw pneumatic screw drill was optimized, with maximum torque up to 256 N·m. A multi-functional dust collector is developed, which integrates the pressure air monitoring system and oil mist lubrication system. The electromagnetic wave while drilling system power battery was improved, then the system usage time and stability were improved. The technology of double dynamic composite strong slagging and directional drilling for long distance screen completion of crushed soft coal seam were developed. The test of soft gas dynamic directional drilling technology and equipment were carried out at 1682(1) transportion lane of Huainan Pansan Coal Mine. There were 16 drilling holes with depth of more than 240 m have been completed successively, with a total test footage of 4 548 m, and the penetration rate of coal seam reaches 93.1%. All directional holes run through the screen, with a maximum drilling depth of 423 m, which created the maximum drilling depth record of dynamic directional drilling for crushed soft coalbed methane in China. The continuous pumping has began during the test process, and the average extraction concentration is 60% and the maximum reaches 81%. The extraction mixture is basically maintained at 1.5 m3/min, the average extraction yield is 0.9 m3/min, the maximum extraction purity is 1.56 m3/min, and the total pure extraction was 174 000 square meters. The test results prove that the complete set of equipment is featured with stable performance, easy to use, remote control operation and safe construction, which meets the drilling needs of soft coal seam dynamic directional drilling. It has formed a set of soft coal seam directional drilling construction technology and equipment in Huainan mining area, providing necessary technology and equipment support for safe and efficient extraction in mining area.