钻头

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

型头磨刀机结构简单，使用方，装夹就可以完成头的尖和横刃的修磨。

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

简 介: 烧结锥柄头：适用于玻璃、陶瓷等硬性材料的孔。

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.

文章介绍了种新型小尺寸头，它主要由个偏的多锥形牙轮和个圆形滚轮及两个牙掌组成。

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.

深部井段地层的硬度高、研磨性强，头选型困难，特别是在高密度条件下机械速低。

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.

从井泵经过部输送到头喷嘴的流体是种瞬态流动，存在着压力行波，使从普通喷嘴射出的流体有定程度的脉动。