水环境下铜丝电爆炸特性及其冲击波行为

Discharge Characteristics and Shock Waves Behaviors of Underwater Copper Wire Explosion

针对油气田储层改造中金属丝电爆炸这一新的物理增产技术,为了研究电爆炸冲击波与放电参数之间的关系,搭建了电爆炸试验平台,以铜丝为负载开展了不同放电参数下爆炸特性试验。通过对放电过程中电压、电流、电阻及其沉积能量的分析,研究了电容容量和储能大小对金属丝相变时间、沉积能量及冲击波的影响规律。结果表明,在铜丝从固态到液态相变过程中,电容容量和储能大小对其影响不大,沉积能量为其理论热焓值3倍左右;在铜丝汽化过程中,随着电容储能的增加,60μF容量电容放电时的能量沉积速率要低于30μF容量电容放电,但60μF容量电容在储能较低时仍有较好的放电稳定性。在丝放电过程中,冲击波的峰值压力与铜丝汽化过程中的沉积能量有着紧密的关系,随着沉积能量的增加,它们具有相同的变化趋势。

The electrical explosion of wire (EEW) is gradually acted as a physical and environmentally friendly enhanced oil recovery (EOR) technology in petroleum industry. In order to establish the relationship between the shock waves (SWs) and EEW, the process of underwater EEW was investigated under the different energy deposition based on the measurements of the current, voltage and shock waves. Through the analyses of current, voltage, resistance, and energy deposition, the effect of capacitance and stored energy of capacitor on discharge time, energy deposition in each stage and SWs were studied. The results show that the capacitance of capacity and stored energy has a negligible effect on the energy deposition in solid and melt stage of wire, except in vaporization process. The energy deposition rate in vaporization process under the discharge by capacitor with 30 μF capacitance is higher than that with 60 μF capacitance. During the wire discharge process, the peak pressure has a close relationship with the energy deposition in vaporization process, and they have the same change tendency.