High-Voltage Electrical Impulse Rock-Breaking Principle Prototype and Investigation of Electrical Parameters

Due to the complex geological conditions and the low ability to drill into deep strata, the current traditional mechanical methods in deep well drilling have the problems of low production efficiency and high working costs. Aiming at the problem of modularization of industrial applications of pulse generators in high-voltage electric pulse rock breaking technology, a high-voltage electric pulse rock breaking system based on the compound booster method is proposed in this study, and the miniaturization of high-voltage electric pulse rock breaking equipment is realized. A small pulse generator based on the compound booster method is designed. A set of high-voltage electric pulse rock-breaking experimental platforms is set up with a multistage BK booster circuit and a voltage-doubling circuit. Under the condition that the output discharge frequency is 5 Hz and the peak voltage is not less than 500 kV, the platform is used to carry out the fracturing experiment of ~3000 m Yingcheng formation rhyolite. COMSOL Multiphysics software was used to build a rock breakdown simulation model, and the rock-crushing process was revealed under the action of the high-voltage electrical pulse through simulation. The results show that the experimental platform can meet the requirements of the high-voltage electric pulse rock-breaking experiment, and the combined pressure booster method expands the design idea for the industrial application of high-voltage electric pulse drilling technology.