螺纹孔轻型钻夹头
light drill chuck with thread contact
扩孔钻和锥管丝锥复合刀具
combined taper pipe tap and core drill
空气钻井防燃爆监测系统
downhole explosion monitoring system for air syste
聚合物盐水钻井液
Polymer salt water drilling fluid
锯钻组合机床
saw-drill combination machine tool
径向水平钻井系统
ultrashort radius radial system
井下钻孔瓦斯解吸法
Gas desoiption method by underground boreholes
精密深孔钻孔工具
precision deep hole drilling tool