弹簧片式牵引器牵引锁止力学及结构优化研究

Mechanical Analysis and Structural Optimization of Traction Locking for Spring Sheet Tractor

为满足水平井井下工具的输送要求,本文提出了一种新的具备大牵引力、防卡堵的液压伸缩式井下牵引器;牵引器支撑机构能否保持与管壁锁止,是伸缩式牵引器能够向前爬行的关键。因此,本文建立了牵引器在负载力作用下的牵引锁止力学模型,通过计算得到支撑机构不同布局方式下的牵引锁止条件,同时以较小支撑缸的压力为评价标准,得到伸缩式牵引器的最佳布局方式;最后通过仿真分析验证了牵引器牵引锁止条件的正确性,本文的研究成果对伸缩式牵引器的设计具有一定指导意义。

In order to meet the transportation requirements of downhole tools in horizontal wells, a new hydraulic telescopic downhole tractor with high traction and anti-jamming is presented in this paper. Whether the supporting mechanism of the tractor can be maintained and locked up with the pipe wall is the key for the retractable tractor to crawl forward. Therefore, the mechanical model of the traction locking of the tractor under the action of loads is established, and the conditions of the traction locking are analyzed. With the smaller supporting cylinder pressure as the evaluation standard, the traction locking conditions under different layout modes of the supporting mechanism are analyzed, and the optimal layout of the hydraulic telescopic downhole tractor is obtained. Finally, the correctness of the traction lock-up condition of the tractor is verified by simulation analysis. This paper has certain guiding significance for the design of hydraulic telescopic tractor.