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为有效检测连续油管的疲劳损伤并预测其寿命,将金属磁记忆技术应用于连续油管的弯曲疲劳研究。对内压和弯曲载荷共同作用下的全尺寸连续油管试样在不同循环弯曲次数下的状态,进行磁记忆检测试验,探索能够用来表征连续油管疲劳过程的磁记忆信号特征。结果表明:磁记忆信号与连续油管疲劳损伤状况间有相关性,连续管出现疲劳损伤时磁记忆信号发生跳变,磁记忆信号的切向分量梯度值作为其特征参量,可以描述连续管受内压和弯曲过程的疲劳程度。金属磁记忆检测技术能被用于评估连续油管的疲劳损伤状况和预测其剩余寿命。
In order to effectively detect the fatigue damage of coiled tubing and predict its life, metal magnetic memory technology is applied to the study of the flexural fatigue of coiled tubing. Under the conditions of internal pressure and bending load, the full size coiled tubing samples under different cyclic bending times were tested by magnetic memory to explore the characteristics of magnetic memory signals that can be used to characterize the fatigue process of coiled tubing. The results show that there is a correlation between the magnetic memory signal and the fatigue damage of the coiled tubing, and the magnetic memory signal jumps when fatigue damage occurs in the continuous tube. The tangential component gradient value of the magnetic memory signal is taken as the characteristic parameter, The degree of fatigue during compression and bending. Metal magnetic memory testing technology can be used to assess the coiled tubing fatigue damage and predict the remaining life.