Study on transient energy transformation and influence factor during perforation explosion

doi:10.16265/j.cnki.issn1003-3033.2023.09.0223

Abstract

Abstract:

In order to effectively control the risk of safety accidents such as string and packer failure under the perforating well-test combination, a jet penetration model of the perforating shaped charges was established based on the fluid-structure coupling theory. A study for the jet kinetic energy and shell melting energy of the perforating shaped charges was presented to evaluate the transformation law of the jet kinetic energy and shell melting energy and the influence factors of the remnant energy of the perforating shaped charges by taking into account the shell structure, the mass and type of the explosive, the conical liner structure, the perforating gun, and the casing. The obtained results indicate that the remnant energy of the perforating shaped charges is significantly affected by the cone angle of the conical liner, the thickness of the shell, and the mass and type of the explosive. The remnant energy ratio is decreased with an increase in the cone angle of the conical liner between 40° and 70° and an increase in the thickness of the shell between 1 mm and 4 mm. The remnant energy ratio is increased with an increase in the mass of the explosive. With the same explosive mass, the Octogen(HMX) explosive has the smallest remnant energy ratio among Trinitrotoluene (TNT)、Hexanitrostilbene (HNS)、Hexogen (RDX), and HMX explosives.

Key words: perforation explosion, energy conversion, transient pressure, fluid-structure coupling, perforating shaped charge structure

DING Liangliang, LEI Qisong, CHEN Wenkang, XUE Yongzhi, ZHANG Qiang. Study on transient energy transformation and influence factor during perforation explosion[J]. China Safety Science Journal, 2023, 33(9): 76-85.

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参数	炸药能量/kJ	射流能量/kJ	能量占比/%
试验	72.046	10.411	14.450
仿真	73.458	12.253	16.760
误差/%	1.922	15.033	13.783

—	C-J参数				JWL状态方程参数
炸药	密度/(g·cm^-3)	爆压/GPa	爆速/(mm·μs^-1)	E₀	A/GPa	B/GPa	R₁	R₂	ω
TNT	1.630	27.000	6.930	7.000	374.000	3.230	4.150	0.950	0.3000
HNS	1.650	21.500	7.030	7.450	463.100	8.873	4.550	1.350	0.350
RDX	1.800	34.100	8.700	10.000	806.100	12.000	4.230	1.210	0.330
HMX	1.891	42.000	9.110	10.500	778.300	7.071	4.200	1.000	0.300