We need a short drill collar.

需要一根短钻铤。

We need a short drill collar to put here.

这里要接一根短钻铤。

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。

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。

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。