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在对矿产进行详勘 (即在对已经很好研究过的地质剖面中的围岩钻进)时,建议采用无岩心钻进。这种钻进方法由于能提高纯钻进时间、机械钻速和回次钻速,因而能大大提高工作效率。无岩心钻进还可在岩心采取率很低或者岩心被强烈选择性磨损的矿段内使用。在同一钻孔的不同孔深段普遍采用岩心和无岩心的联合钻进方式。为了进行无岩心钻进,研制了符合地质勘探规范的标准钻头系列,这些钻头在钻孔时可使碎岩工具任意组合。无岩心钻进时,根据岩石的物理-机械性质,选用批量生产的各种翼片式、牙轮式和金
Coreless drilling is recommended for detailed mineral surveys, ie for the surrounding rock in well-studied geological sections. This drilling method can greatly improve work efficiency because it can improve pure drilling time, ROP and ROP. Coreless drilling can also be used in sections where the core rate is low or cores are strongly selectively worn. In the same hole in different depths of the hole commonly used core and non-core joint drilling. In order to perform coreless drilling, a series of standard drill bits that meet the geological prospecting specifications were developed. These drill bits allow any combination of rock breaking tools to be drilled. No core drilling, according to the rock’s physical - mechanical properties, the choice of mass production of various wing-type, cone-type and gold