钻工用合适的丝扣油涂抹接头母扣。
The Floormen apply proper pipe dope into the thread box of the pipe joint.
爆炸所产生的力使母扣扩大，足以使丝扣连接处瞬时松开。
The force of the explosion enlarges the female (outer) thread enough that the threaded connection unscrews instantly.
它是个上端为钻杆母扣或者由壬，下端为套管公扣，内空心的转换接头。
Its upper end is drill pipe box or union, the nether end is casing pin. It is a crossover with hollow inside.
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