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用吊钳将钻铤紧扣时,往往难以保证足够的扭矩,这是钻铤丝扣先期损坏的原因之一。 适当改变钻铤连接部分的结构形式,可以使钻铤丝扣获得可
It is often difficult to ensure sufficient torque when the drill collar is fastened with tongs, which is one of the reasons for early damage to the collar. Appropriate to change the structure of the drill collar part of the connection, you can make the collar drill collar available