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某一北方地区在进行水文地质钻孔钻进时有效地使用了压缩空气来清洗孔底。钻进是在冻结岩层中进行的。这一区域的永久冻土冻结得很深。在钻孔布置区内发育的岩石是下石炭纪的灰岩、泥质页岩和砂岩。砂岩在有些地段已剧烈地花岗岩化。岩石的可钻性为Ⅳ—Ⅸ级。
A northern region effectively uses compressed air to clean the bottom of the hole during hydrogeological drilling. Drilling is done in frozen formations. Permafrost in this area is frozen deep. Rocks developed in the borehole layout area are Lower Carboniferous limestone, shale shale and sandstone. Sandstone has been intensively granitized in some areas. Rock drillability of Ⅳ-Ⅸ level.