空气潜孔锤在松散地层中的钻进试验

Drilling Tests in Loose Formation with Air DTH Hammer

空气潜孔锤钻探工艺在基岩地区已是首选的一种技术。传统观念认为空气潜孔锤钻进工艺适用于坚硬岩石(硬、脆、碎地层),在松散地层中则需要常规泥浆回转钻进或冲击钻进。通过典型松散地层的试验证明:空气潜孔锤在松散覆盖地层中可以实现正常的钻进,并且具有效率高、成本低、劳动强度小等优点,在粘土和潮湿粘土地层中钻进效率最高可达87和72 m/h。为解决页岩气、地热、煤层气、地下水等能源资源勘探时上覆地层的开孔或一开钻进提供了行之有效的方法,同时,也解决了缺水地区或严重漏失地层钻井液用水困难和传统开孔或一开泥浆回转钻探工艺复杂等问题。

Air DTH hammer drilling is a preferred technology in bed rock area, which by tradition is suitable for hard rock drilling（in hard, brittle and broken formations）;while for loose formations, conventional mud rotary drilling or percussive drilling should be used.Based on the test on typical unconsolidated formation drilling, it is proved that normal drilling can al-so be realized in loose overburden layer by air DTH hammer with advantages of high efficiency, low cost and small labor in-tensity, the highest drilling efficiency is up to 87m/h and 72m/h in clay and moist clay drilling respectively.This result pro-vides an effective method to hole opening or the first spud section drilling for the exploration of shale gas, geothermal energy, coal seam gas and underground water in overlaying layers and solves the water shortage for drilling fluid in water scarce areas or serious leakage formations and avoids the difficulties in the complicated processes of conventional mud rotary drilling.