关于钻头的结构、水力学及其性能方面的四项最新研究引起了人们的注意。这四项研究是:最大限度地加大钻井液对井底的冲击压力来大幅度增加机械钻速;第一次用实际钻头在实验室钻页岩,来进行钻头水力效果的研究;具有横向流动的二喷咀钻头可以专门用来改善配有低压泥浆泵的钻机性能;研究了软地层钻头的钻井条件与机械进尺关系的新模型。 Four new studies on the structure, hydraulics and performance of bits have drawn the attention. The four studies are: to maximize the impact of drilling fluid on the bottom of the hole to a substantial increase in ROP; the first drill drilled shale in the laboratory with the actual drilling bit hydraulic effect of research; with horizontal The mobile two-nozzle drill can be used to improve the performance of drilling rig equipped with low-pressure mud pump. A new model of the relationship between the drilling conditions of soft formation drill and the mechanical footage is studied.