在整个石油企业的抽油装置中,抽油杆公扣和接箍的断脱约占全部抽油杆断脱事故的65—80％。有鉴于此,制造厂和使用部门都曾多方探索消除抽油杆这个先天性缺陷的途径。通常,制造方法或现场操作的每一改进都能延长抽油杆的寿命,例如:在公扣端加工应力减轻槽,滚压螺纹,采用淬硬的接箍,使用动力抽油杆钳,在丝扣油 Throughout the oil rigs of oil companies, the breakage of the sucker rod buckles and couplings accounts for 65-80% of the total sucker rod breakage accidents. In view of this, both manufacturers and users have explored ways to eliminate the congenital defect of sucker rod. In general, every improvement in the manufacturing method or on-site operation can extend the life of the sucker rod. For example, stress relieving grooves are machined at the male end, rolled threads, hardened couplings, powered sucker rod tongs, Thread oil