Perpendicular to the ground well and long boreholes CBM extraction method of joint

The present invention is well ground and perpendicular to the joint long boreholes CBM extraction method, belonging to the coal and rock permeability improver BACKGROUND CBM extraction method; problem to be solved is to provide a surface perpendicular to the well and the downhole cis long boreholes are combined to achieve a lower economic cost efficient method of extraction CBM; technical proposal is: a, perpendicular to the ground construction of wells; B, roadway construction underground drainage CBM; C, evacuated to the target mining seam long boreholes drilled vertical wells intersection with the ground; D, into the high-pressure water into the tool, rotate in place, forming a vertical fissure; E, drilling continues back, back some distance stopped, the new construction of a large vertical cracks in the step d of the method; F, repeating steps E, forming a plurality of vertical cracks in a large long boreholes; G, exits the drill, to drill long bedding plugging the hole; the I, perpendicular to the ground well and drainage pipeline connecting CBM, CBM drainage embodiment; high drainage efficiency of the present invention, practical.