大位移塑性变形下连续油管直径增长规律研究  

Study on diameter growth law of coiled tubing under severe plastic deformation

作　　者：李晓秋[1] 樊建春[1] 范磊[1] 张喜明[1] 张国营[1] 宋宇[1] 

机构地区：[1]中国石油大学〈北京〉机械与储运工程学院,北京102249

出　　处：《中国安全生产科学技术》2013年第5期25-28,共4页Journal of Safety Science and Technology

摘　　要：连续油管的工作过程是大变形塑性过程。在内压、弯曲疲劳周期复合载荷作用下,随着循环次数的增加,连续油管直径增长、壁厚减薄,同时椭圆化。连续油管直径的改变会引起与其配套设备的不兼容性,进而导致连续油管严重机械损坏。在对轴向应变、环向应变、径向应变软件仿真计算和全尺寸试验对比分析的基础上,阐述了连续油管管体直径改变的规律,找出连续油管在疲劳损伤过程中的最大直径的增长规律。在25MPa内压、300mm行程作用下,直径增长呈指数形式,且通过最大直径与循环的关系及拟合公式,可以预判连续油管的疲劳损伤程度及变形危险区域。The working process of coiled tubing （CT） has severe plastic deformation. As the cycle increases, the diameter is grown and the thickness is reduced, simultaneously ＂ballooned＂ applied by internal pressure and the bending periodic multiple loads. Because the variation of diameter of CT may cause the incompatibility with other e- quipments, which can lead to the great mechanical damage, it is very significant to find the variation regulation of the diameter and the predict model for the growth of the diameter for the safety and reliable operation and service. In this paper, the simulation calculation for axial, hoop, radial strain and the full-scale fatigue experiment were in- vestigated. According to the comparative analysis between simulation and the experiment, the variation regulation of diameter was studied and the growth model of the maximum diameter during fatigue deformation was established. Under internal pressure with 25MPa and the displacement with 300mm, the growth of diameter was exponential. Based on the curve fitting, the damage degree and the dangerous area can be predicted.

关 键 词：连续油管 疲劳 直径 增长模型 全尺寸 

分 类 号：X937[环境科学与工程—安全科学]