green bit

The pattern specialty of new type inserted bits and their main technical specifications and application cases are introduced following the drilling techniques and rock characteristics of continental scientific drilling.

结合大陆科学钻探岩性特征和钻进工艺 ,介绍了新型镶嵌式钻头设计的结构特点、主要技术参数和现场应用情况 ,较好地解决了硬岩、深孔的取心钻进问