Discussion on Fracturing Mode and Mechanism of Coalbed Methane in Tectonic Coal

In view of the poor effect of CBM development in tectonic coal area, based on the analysis of the engineering cases of horizontal wells and vertical wells under the condition of tectonic coal in Huaibei Mining Area and Hongshandan Mining Area in Hunan Province, combined with the analysis of the initiation and extension mechanism of hydraulic fracturing, the paper proposes the technology of indirect fracturing of tectonic coal by “breaking the wall”, that is, selecting suitable rock layers for fracturing construction in the roof and floor of tectonic coal. This technology can create long pressure fractures with good communication with the coal seam, greatly improve the stimulation effect of fracturing, effectively reduce the damage of drilling fluid and fracturing fluid to the coal seam, and improve the drainage effect of coalbed methane.