The research of high voltage power power supply with a high-energy arc fracturing device

The rock fracturing technology can effectively enhance the reservoir permeability and conductivity of oil reservoir and improve the production of oil and gas. In this paper, high-current pulse discharge on rock fracturing was studied and a high voltage pulsed power supply was developed. The pulsed power supply is mainly composed of a high voltage high frequency charging supply, energy storage capacitors, a discharging electrodes and a safety discharging device. The maximum energy of the pulse power supply is 40kJ and working voltage is up to 20kV. The fracturing experiments are done on ten cement sandstones at low energy and high energy without confining pressure. Through the fracturing experiments of different samples, length and shape of the fracture have relations with pulse energy, the discharge voltage, discharge times and density of the rock.