射孔弹爆炸作用下射孔枪动态响应的数值仿真

射孔作业时射孔管柱的爆炸冲击动力学响应成为油、套管柱系统振动、变形乃至损伤的主要原因. 为研究射孔枪内爆炸冲击波加载规律以及尤其引发的管柱动力学响应规律,建立包含一枚射孔弹的射孔系统有限元模型进行数值计算. 所得数值计算测点应变值与地面试验数据相对误差不超过10%. 进一步分析发现:射孔弹爆炸加载过程中射流冲击作用效果最为显著;射孔弹壳体对爆炸产物的约束作能够有效降低爆炸冲击对枪管的加载(损伤);相邻射孔弹爆炸冲击将会在弹间交汇、叠加,耦合结果与相位、弹间距相关.

Simulation Research into Dynamic Response of Perforating Gun with Gunshock Loads

Blast impact dynamic response of string is one of the main reasons which lead to vibration, deformation, even damage of the system. In order to gain a better understanding of behavior of shockwave loads and dynamic response of string, a finite element simulation model was founded. The numerical simulation was performed using fluid-solid coupling codes and consistency checks. The errors of strain values were suggested to be less than 10% between numerical results and experimental data obtained from ground test. It is found that impact of jet is the most significant in the explosive loading process. The shock damage can be reduced effectively by the constraints for explosion products from perforating charge shell. The effects of the adjacent perforating charges explosion related to the phase and the spacing will be coupled.