连续油管井下力学行为模拟实验研究

摘要

The coiled tubing systems are under complex underground loading. In this paper, the actual depth at which the coiled tubing goes into well is obtained and also the solution about the buckling, the lock-up and the un-lock-up of the coiled tubing. According to the relevant theoretical calculation results, the appropriate geometric parameters of the experimental system are determined. The test bench is designed, the simulation experiments about different specifications and different bending segment length of coiled tubing are carried on. The experimental phenomena about buckling, helical lock-up and top end yielding are analyzed, and the conditions of the helical lock-up are determined. The experimental results are in a good agreement with the theoretical results and may serve as a basis for the analysis of mechanical behavior of coiled tubing in wells.%连续油管作业系统在井下受力复杂，借助相关实验研究可为连续油管实际入井深度、连续油管屈曲、锁死及解除锁死等问题提供解决思路．根据相关理论计算结果确定了合适的实验系统几何参数．设计了实验台架，进行了不同规格模拟连续油管和不同弯曲段长度实验．分析了屈曲、螺旋屈曲锁死、首端屈服等实验现象，提出了螺旋屈曲锁死的条件．实验结果与理论计算结果吻合较好．该实验为连续油管井下力学行为分析提供了依据．