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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.
youdao
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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.
youdao