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.
当公标尖端部的第一台阶处折断后,尚有棘刺形的第二台阶与母标相扣合,避免了掉标的可能。
After the first step of the tip part of the male mark is broken off, the second thorn-shaped step is buckled with the female mark, which avoids the possibility of mark falling.
它由公扣和母扣组成,公扣的外周设有安装环槽,公扣的一端设有凸出部;
The periphery of the male buckle is provided with an installing ring groove, and one end of the male buckle is provided with the bulge.
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