【摘要】 连续管在经过注入头后还具有初始曲率。为了改善具有初始曲率的连续管在井下受轴向载荷发生失稳屈曲的问题,以井口具有初始曲率的连续管为研究对象,基于弹塑性变形理论分析了连续管在弯曲校直过程中的截面变形,构建了连续管弯曲校直过程计算模型,计算得到应施加反向弯矩值,使连续管校直。为了验证该计算模型的准确性,以?38.1 mm×3.2 mm CT90钢级连续管为例进行计算分析,计算得反向弯矩1 885 N·m,与采用ANSYS Workbench仿真分析的反向弯矩1 963 N·m进行对比,两者误差仅为4.1%,在工程许可精度范围内,证明该计算模型可以用于指导连续管弯曲校直工作。研究结果对于连续管在现场的安全应用具有一定的参考作用。更多还原

【Abstract】 The coiled tubing has an initial curvature after passing the injector. To address the problem of buckling of coiled tubing with initial curvature under axial load in the hole,the coiled tubing with initial curvature at the wellhead is taken as the research object. Based on the theory of elastoplastic deformation,the cross-sectional deformation of the coiled tubing during straightening is analyzed. A calculation model for the straightening process of the coiled tubing is established. The calculated results indicate that reverse bending moment is needed to make the coiled tubing straightened. To verify the accuracy of the calculation model,the calculation and analysis are carried out with ?38.1 mm × 3.2 mm CT90 coiled tubing. The calculated reverse bending moment is 1 885 N ·m,which is only 4.1% different compared with the reverse bending moment of 1 963 N·m analyzed by ANSYS Workbench. The difference is within the engineering permission accuracy range,which proves that the calculation model can be used to guide the straightening of the coiled tubing. The study results have a certain reference for the safety application of coiled tubing in the field.更多还原