钻头

ZZM-A drill grinder simple structure, easy operation. One setup to complete grindings on drill web and chisel edge.

型钻头磨刀机结构简单，使用方便，一次装夹就可以完钻头的钻尖和横刃的修磨。

Sinter type fastigiate-handle drills:Use for drilling hard and brickle material,...

简 介: 烧结锥柄钻头：适用于玻璃、陶瓷等硬性材料的钻。

In this paper,a new small-sized bit is introduced.The bit is mainly composed of a biassed polyconic cutter,a cylindric roller and two bit legs.

介绍了一种新型小尺寸钻头，它主要由一个偏的多锥形牙轮和一个圆柱形滚轮及两个牙掌。

The deep formation has a high degree of hardness and abrasivity;the bit type selection is difficult and the ROP is low especially under the high density mud.

部井段地层的硬度高、研磨性强，钻头选型困难，特别是在高密度条件下机械钻速低。

Fluid is conveied to bit nozzel through drill string from pump is a transient state flowing with pressure wave, which makes the fluid jetted out from nozzel has certain pulsation.

从钻井泵经过钻柱内部输送到钻头喷嘴的流体是一种瞬态流动，存在着压力行波，使从普通喷嘴射出的流体有一定程度的脉动。