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机上钻杆下端的母丝扣,由于经常与井内钻杆接手扭接,常把丝扣磨损,影响正常钻进。后采用公母接手(如图),把它的公扣接于
Bolts at the lower end of the drill pipe, often threaded together with the drill pipe in the well, often wear the threaded fasteners and affect the normal drilling. After the adoption of male and female take (pictured), the male buckle connected to it