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1·We need a short drill collar.

需要一根短钻铤。

2·We need a short drill collar to put here.

这里要接一根短钻铤。

3·In the event failures of boring tools, the fatigue failure of the drill collar is especially prominent.

在钻具失效事故中，钻铤的疲劳失效尤为突出。

4·As such, magnetic particle inspection for the screw thread of the drill collar is very necessary and important.

因而钻铤内外螺纹的磁粉检测十分必要和重要。

5·A log similar to a dual induction log but made by an electromagnetic propagation tool built into a drill collar.

与双感应测井类似的一种测井方法，用安装在钻铤中的电磁传播仪进行测量。

6·When picking up or setting down drill collar stands larger than 6 1/4 on the floor board, always snub with the air tugger.

当在钻杆盒上提起或放置直径大于6 1／4〞的钻铤立柱时，一定要用气动绞车拉住以保安全。

7·Fit the rig tongs with the correct jaws for the drill pipe tool joint or the drill collar. Re-install the safety lock springs.

给大钳装上与钻杆接头或钻铤相匹配的钳头，再装上安全锁簧。

8·Do not make up or break out the bit on a single joint of DC. If this is absolutely necessary, always snub drill collar with the air tugger.

不要在一单根钻铤上卸钻头，如果确实需要这样做，要用气动绞车拉住钻铤。

9·Because its rigidity are less than the drill collar, less contact area with wall of a well, is also not easy to form differential pressure sticking.

由于其刚性比钻铤少，和井壁接触面积小，也不容易形成压差卡钻。

10·After processing LET thread, stress groove and double shoulder connection for the NC35 thread of Drill Collar in 43/4 inch, torsion tests were done.

4英寸）钻铤NC35螺纹加工LE螺纹、应力槽、双台肩后进行了实物抗扭性能试验，证实双台肩钻铤具有很好的抗扭性能。