Principle and engineering practices on coal reservoir permeability improved with electric pulse controllable shock waves

In order to solve the permeability improved and reconstruction technology of the coal reservoir faced to the coal bed methane high efficient development and the mine gas control, a new technology of the intensity, regional function and multi function controlled electric pulse controllable shock waves was successfully rese arched and developed and several site application discoveries were conducted. The coal reservoir was reconstructed by the shock waves with the breaking, tearing, ela stic sonic wave turbulence and other method. The shock waves would have the sectional and frequency band basic features, the basic features combined with the repe ated loading fatigue effect could make the controllable shock waves with the incomparable advantages than other reservoir reconstruction technologies. The reconstruct ion effect would depend on the coupling features of the shock amplitude value, loading frequency and coal reservoir physical properties, the coupling role of the shock a mplitude value and seam physical properties would decide the propagation features of the shock waves in the seam and the coupling of the loading frequency and coal reservoir physical properties would be related to the fatigue effect of the coal reservoir. An underground mine operation device of the electric pulse controllable shock W aves was innovated and a completed site operation technical process was preliminarily formed. The site experiments showed the benefit and efficiency of the technolog y in the reconstruction of the borehole along the seam and the gas drainage and the conceivable prospects of the coal reservoir reconstruction for the coal bed methan e well at the surface ground.