我队勘探矿区紧靠淮河边,大部分钻孔都通过流砂层,由于水文工作要求钻孔须用清水钻进,曾采取钻一段冲一阵和跟管钻进的方法,但都无效,后经实际摸索,采取快速度一次钻到底的方法,战胜了流砂层。我们的经验如下: My team explored the mining area close to the Huaihe River, and most of the boreholes passed the sand runoff. Since the hydrological work requires that the borehole be drilled with clean water, a method of drilling for a while and drilling with the pipe has been adopted, The actual exploration, to take a quick drilling in the end the way to overcome the sand layer. Our experience is as follows: