摘要
高压电脉冲压裂技术是基于"液电效应",通过水中脉冲放电产生强大的冲击波使岩石产生裂缝,近年来成为了岩石压裂领域的热点研究对象。搭建了两路电流源模块应用于水中放电,采用铜材料的针针电极,电极间距1mm;研究了在不同放电电压下,单路和两路电流源模块电极间的电压、电流波形。实验结果表明,空载时在同一放电电压下,双路模块产生更大的放电电流,从而在放电时获得更高的瞬时功率;而在水中针针放电时,单路和双路模块水间隙的预击穿时间与放电电压之间具有很大的随机性。单路模块预击穿时间的标准差最小为0.285ms,最大为1.481ms;而双路模块最小为0.369ms,最大为0.703ms。并且随着放电电压的增加,预击穿时间减小,双路模块的预击穿平均时间从放电电压为1300V时的2.686ms降到1800V时的1.036ms。
High-voltage pulse fracturing technology is based on the"electro-hydraulic effect"principle,where strong shock wave generated by the discharge of water pulse creates cracks in the rock.It has become a hot research subject in the field of rock fracturing.This paper sets up two types of current source modules applied to the water discharge,the single and the double current source modules.And the electrodes voltage and current waveforms of the modules are explored by the needle electrodes at different discharge voltage with 1mm electrode gap.The experimental results show that at the same discharge voltage without any load,the double module generates greater discharge current,resulting in higher instantaneous power at the time of discharge;while for underwater discharge,there is a great randomness in the pre-breakdown time of the water gaps.The minimum and maximum standard deviations of the pre-breakdown time for the single module are 0.285 ms and 1.481 ms respectively,while for the double module,the minimum and maximum deviations are 0.369 ms and 0.703 ms.From the overall trend,the higher the discharge voltage is,the shorter the pre-breakdown time will be:the average time of the double module varies from 2.686 ms at1300 Vto 1.036 ms at 1800 V.
引文
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