等孔径射孔弹数值模拟与试验研究

采用数值模拟对比了3 1/2 in*型等孔径射孔弹与同规格常规深穿透射孔弹在井筒内装枪极限情况下的射流形态,并采用地面模拟试验对比了两者孔眼一致性.数值模拟结果表明,后者药型罩在压垮过程中形成了细长的锥形射流,尾部形成了粗大的杵体,而前者能够形成一段高速的杆式射流,不易受炸高的影响;地面模拟装枪侵彻钢靶结果表明,前者射孔后在套管上形成的平均孔径为12.3 mm,孔径稳定性为96.7%,比后者平均孔径提高了2.3 mm,孔径稳定性提高了20.4%,说明其具有较大的孔径和好的孔眼一致性,同时也验证了数值模拟结果与实验值相符.3 1/2 in型等孔径射孔弹地面模拟装枪侵彻混凝土靶平均穿深为810 mm,表明其具有深穿透特点.

Numerical Simulation and Experimental Research on Equal Hole Shaped Charge

The jet form under ultimate gun loaded condition in wellbore between 3 1/2 in equal hole (EH) shaped charge and conventional DP charge was compared with the numerical simulation method, and the stability of entry hole diameter of two types of the charges was compared by ground numerical testing.The numerical simulation results show that the liner of the former charge produced a length of high speed rod-shaped jet that was not easily affected by explosion height relative to the later which produced spindly taper jet from the head and big slug from the end during penetrating in steel target.The ground numerical testing results show that the average entry hole diameter on casing of the former charge was 12.3 mm and the compatibility reached to 96.7%, the average entry hole diameter improved 2.3 mm and compatibility improved by 20.4%, which proved that the EH charge has bigger entry hole diameter and better compatibility and the numerical simulation is accurate.The average penetration of 3 1/2 in EH charge in concrete target was 755 mm, which show the deep penetration of charge.