1.
blank-casing bit
套管底部装用的环状钻头坯
2.
and are fitted with a cutting bit at the bottom.
它的底部装有钻头。
3.
Leak-off for double packing (optional). A lantern ring and leak-off pipe are provided for removal of leakage, if any, from lower packing set.
双重包装（备选）的破裂点。如果有，则用套环和破裂管来更换底部包装泄漏部分。
4.
part of a drill that grips the bit
夹头（钻或钻床上用以夹住钻头的部分）.
5.
a tiara that was set with diamonds.
用钻石装饰的妇女头饰
6.
Research and Development of Round Billet for P110-Grade Oil Casing
P110级石油套管用圆坯的研制与开发
7.
the cutting part of a drill; usually pointed and threaded and is replaceable in a brace or bitstock or drill press.
钻机的切割部分；通常是尖头的有螺旋状图案并且可以更换，用在钻柱钻柄或钻床上。
8.
This paper has introduced a set of test device to examine the loads on teeth of the bit at different rotary speed and under high bit-weight.
本文介绍了一套测试装置,用以测试钻头在大钻压下任意转速的牙齿受力。
9.
floating in casing
下部装回压阀的套管柱
10.
The development and application of a new type rock bit with bearing liner structure;
镶套轴承结构牙轮钻头的开发与应用
11.
The generously designed drill rod clamping device can be opened up fully to enable the installation of drilling tools and drill casings exceeding 171/2" (444 mm) in diameter.
如图所示的钻杆夹持装置可安装最大直径为444毫米的钻具和套管.
12.
7.12 Trip up at once, pull the bit into the casing.
立即起钻，将钻头提到套管内。
13.
bottom-dwelling coastal fishes with spiny armored heads and fingerlike pectoral fins used for crawling along the sea bottom.
沿海水域中底栖鱼，头部有刺状盔甲，指状的胸鳍可用于沿海底爬行。
14.
Pipe section for connecting the top/bottom of one shape to the bottom/top of another. Arrowhead can be shown or hidden.
将一个形状的顶部/底部连接到另一个形状的底部或顶部的管道段。可显示或隐藏箭头。
15.
Research and Application of Casing Drilling Technology in Shengli Oil Field;
套管钻井技术在胜利油田的应用研究
16.
Application of side tracking casing cutting window technique in Wangyun 2B Well;
套管开窗侧钻技术在王云2B井的应用
17.
Application of Sidetracking Technique through Cutting Window on Casing in Bamianhe Oilfield
套管开窗侧钻技术在江汉油田的应用
18.
Bite type tube fittings--Pressure bush for butt joints
GB/T3761-1983卡套式管接头用锥体环