缠绕弯曲多次循环下连续油管疲劳寿命仿真分析

Fatigue Life Simulation of Coiled Tubing under Multiple Winding and Bending Cycles

针对连续油管在压裂工况下容易产生疲劳失效问题,以QT-900连续油管为研究对象,采用Abaqus有限元分析软件对不同内压下连续油管在滚筒上缠绕/弯曲进行了数值模拟分析,将有限元仿真计算结果导入Fe-safe疲劳寿命预测软件计算,获得不同内压下连续油管的循环次数的变化规律。分析结果表明,随着内压的增大,连续油管的疲劳寿命呈现非线性下降的趋势,且将仿真结果与试验结果进行对比,结果吻合较好,说明有限元仿真可以近似替代试验。随着内压的增大,连续油管的疲劳寿命呈现非线性下降的趋势,当内压增大到80 MPa,连续油管的循环次数约为50次。

Aiming at the problem that coiled tubing is prone to fatigue failure under fracturing conditions,the QT-900 coiled tubing was used as the research object,and the Abaqus finite element analysis software was used to numerically simulate and analyze the coiled tubing winding/bending on the drum under different internal pressures.The finite element simulation calculation results were imported into Fe-safe fatigue life prediction software to calculate the cycle times of coiled tubing under different internal pressures.The analysis results show that with the increase of internal pressure,the fatigue life of coiled tubing shows a non-linear decline,and the simulation results are compared with the test results,and the results are in good agreement,indicating that the finite element simulation can be an approximate substitute for the test.As the internal pressure increases,the fatigue life of the coiled tubing shows a non-linear decline.When the internal pressure increases to 80 MPa,the number of coiled tubing cycles is about 50 times.