基于ADAMS的水力式油管切割工具多体动力学研究

Research on Multibody Dynamics of Hydraulic Tubing Cutting Tool

油管切割工具常因运行不稳定而产生剧烈振动、偏心等问题,进而造成井下事故,严重影响施工安全和切割效率。为降低切割工具事故发生概率,利用ADAMS动力学分析软件,针对研发的井下油管切割打捞一体化工具切割部分进行动态模拟,在不同钻压和转速的情况下,对割刀的角加速度和接触力的变化规律进行分析。分析结果表明:割刀在切削过程中的最优钻压为3 700 N,此时割刀运行平稳;接触力与钻压近似成正比关系;割刀的最优转速为28 r/min,此时割刀运行平稳;转速保持在20～40 r/min的范围内时,切割效果较好;转速对接触力的影响较小,可以适当增加转速以提高切割效率。研究结果可以给水力式油管切割工具的设计提供理论依据。

Tubing cutting tools often experience severe vibration and eccentricity owing to unstable operation, leading to downhole accidents, which seriously affects operation safety and cutting efficiency. To reduce the probability of cutting tool accidents, the ADAMS dynamics analysis software is used to dynamically simulate the cutting part of the developed integrated downhole tubing cutting and retrieving tool. The angular acceleration and contact force of the cutter are analyzed under different WOB and rotating speed. The analysis results show that the optimal WOB of the cutter during the cutting process is 3 700 N, which results in smooth cutter operation. The contact force is approximately proportional to the WOB. The optimal rotating speed of the cutter is 28 r/min, which results in stable operation. When the rotating speed is maintained within the range of 20~40 r/min, the cutting performance is better. The rotating speed has less influence on the contact force, and it can be appropriately increased to improve the cutting efficiency. The study results can provide a theoretical basis for the design of tubing cutting tools.