英语语法分析

It's an alloy not readily drillable.

这是不易钻洞的合金。

A retrievable or drillable packer is set above the formation to be cemented.

在要被注水泥的地层的上面坐封一个可收回封隔器或可钻封隔器。

Drillable analysis of the rocks should be strengthened and bit type selection should be well done.

加强岩石可钻性分析，做好钻头选型工作。