基于有限元法的石油射孔枪弹间干扰研究

石油射孔弹顺序起爆后,弹间冲击波相互作用是一个高度非线性的力学过程。基于有限元法对这一过程进行显式动力分析,由计算结果得知,高孔密射孔枪弹间干扰产生的主要原因是下位弹在不对称的压力场起爆。设计的不同孔密和不同爆速的导爆索两种情形的爆轰试验结果表明,弹间间距越小(即孔密的增加),弹间干扰越严重;随着导爆索爆速的降低,下位弹射流头部质量集中的"中间"偏转角度增大,上位弹对其干扰越明显。以上结论可用于高孔密射孔枪的优化设计。

RESEARCH ON INTERFERENCE AMONG PETROLEUM PERFORATION BULLETS BASED ON FINITE ELEMENT METHOD

Shockwave interference among bullets after the sequence blasting of petroleum perforation bullets is a highly-nonlinear mechanics process.It was analyzed by using the explicit dynamic finite element analysis program.The main reason of interference among two perforating bullets was the next bullet detonated in an asymmetry pressure field.Detonation experiments with different shot densities and different explosion velocities of detonating cords were designed.The results showed that the interaction between bullets was more serious as the distance between bullets was smaller.Deflection angle of the'middle'with jet mass centering increased as the explosion velocities of the detonating cords reduced.All these conclusions could be used in optimum design of high shot density perforator.