Controlled shockwave-based stimulation method for coalbed methane (CBM) horizontal well

A controlled shockwave-based stimulation method for a coalbed methane (CBM) horizontal well, wherein a horizontal section of a surface well comprises horizontal well perforations, and the stimulation method comprises following steps:

• S1:
• selecting a group of upward directional drilling sites in an underground roadway of a service mine for a horizontal well, wherein directional drilling target locations are coalbeds respectively directly opposite to horizontal well perforation points and at distances of A m, A-B m, A-2B m, A-3B m, and A-4B m from the horizontal well;
• S2:
• drilling for an A m target location, determining whether the target location is within a fracturing affected zone during the drilling, and determining, after the drilling enters the coalbed, whether the target location is within a drainage affected zone of the horizontal well;
• conducting a controlled shockwave operation when the drilling target location is within the fracturing affected zone;
• and
• drilling, when the drilling target location is not within the fracturing affected zone, for the A-B m or A-2B m or A-3B m or A-4B m target location until a target location within the fracturing affected zone is found;
• and
• S3:
• drilling at each of the horizontal well perforations according to the step S2 and performing a determination until target locations within the fracturing affected zone are found for all the horizontal well perforations, and conducting the controlled shockwave operation.