Fig. 1. Changes in porosity before and after resonance

Fig. 2. Changes in porosity before and after blind vibration

Fig. 3. Schematic diagram of the pulsed resonance technique

Fig. 4. Structure diagram of control system

Fig. 5. Structure schematic of downhole part of the device

Fig. 6. Operating principle diagram of the device

Fig. 7. Typical waveform of voltage and current of pulse discharge in water

Fig. 8. Schematic diagram of field operation

Fig. 9. Result of energy scanning

Fig. 10. Diagram of anisotropic results