This invention relates to the field of
coal seam permeability enhancement technology, and discloses a method and apparatus for multiple fracturing of low-permeability
coal seams using a combination of electrical pulses and supersaturated
ammonium carbonate solution. The method includes: Step 1, drilling a single-hole long borehole in the
coal seam, and then arranging an integrated
discharge device within the borehole; Step 2, injecting a high-pressure supersaturated
ammonium carbonate ion solution into the borehole, using a
data monitoring and control center
system to monitor the data within the borehole and control the integrated
discharge device to release electrical pulses into the high-temperature, high-pressure conductive medium filling the borehole, thereby fracturing the coal seam and releasing gas; Step 3, after the electrical pulses are repeated 6-8 times, the
discharge is stopped, the
electrolyte solution is drained, and the integrated discharge device is removed. The single-hole long borehole is then connected to a gas extraction pipeline for gas extraction. This invention is safe, highly efficient, and has wider applicability, possessing urgent practical significance and important technical value.