钻铤必须是由非磁性物质做成的。

The drill collars must be made of nonmagnetic material.

youdao

这是钻杆丝扣油，不能用在钻铤丝扣上。

The pull rod is screwed into the inside thread of the anchor head.

youdao

这是钻杆丝扣油，不能用在钻铤丝扣上。

This is the dope for drill pipe thread.

youdao

这里要接一根短钻铤。

We need a short drill collar to put here.

youdao

石油钻铤螺纹联接失效是钻具失效的主要类型。

The failure of collar connection thread is one of the prime drill tool failures.

youdao

需要一根短钻铤。

We need a short drill collar.

youdao

需要一根短钻铤。

We need a short drill collar.

youdao