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为了开发脉冲等离子体钻机,开展了高压短脉冲作用下岩石击穿的实验研究。以去离子水为工作介质,将不同种类和不同厚度的岩石放置于尖板电极间,通过加载不同大小的电压于岩石上,考察了岩石的电击穿概率与平均电场强度的关系。实验结果发现:7%空隙率的黄砂岩电击穿场强为70kV/cm;0.8%空隙率的白大理岩电击穿场强为160kV/cm。岩石孔隙率的大小对电击穿场强影响显著,孔隙率越大,电击穿场强越小。岩石厚度对电击穿场强也有一定影响,电击穿场强随厚度增加而减少。
In order to develop a pulsed plasma drilling rig, an experimental study of rock breakdown under high-pressure short-pulse was carried out. Using deionized water as the working medium, rocks of different types and thicknesses were placed between the tip electrodes. The voltage of different sizes was loaded on the rock to investigate the relationship between the rock’s electrical breakdown probability and the average electric field strength. The experimental results show that the electric breakdown strength of yellow sandstone with 7% porosity is 70kV / cm, and that of white marble with 0.8% porosity is 160kV / cm. The size of the rock porosity has a significant impact on the electric breakdown field strength. The larger the porosity, the smaller the electric breakdown field strength. The thickness of the rock also has an impact on the electric breakdown field strength. The electric breakdown field strength decreases with the increase of the thickness.