摘要：The in-situ permeability of coal reservoirs is low, and hydraulic fracturing technology is generally used to create artificial fractures. However, coal res-ervoirs have strong heterogeneity, so the quantitative evaluation of fracturing effect is a technical problem that has not been effectively solved for a long time. In this paper, based on coalbed methane develop-ment data, fracturing data, and microseismic moni-toring results, the effect of hydraulic fracturing of coal reservoirs and the factors affecting productivity were systematically studied. The research results show that the coal reservoir closure stress in the study area is distributed between 11.99-36.85 MPa, the reservoir permeability is distributed between 0.06-0.15 mD,and the coal seam has a high sand-carrying efficiency, so the fracture-forming ability is better. The microseismic monitoring results showed that the scale of cracks after stress interference in-creased significantly,and network cracks formed Hydraulically affected fractures are mostly double-wing fractures,and the effect of fracture extension is ideal, which is beneficial to the production of coal-bed methane. The study also found that the fluid level changes frequently during the drainage cycle. In addition, wells with a wide range of falling liquid velocity have generally low gas production. There is a certain negative correlation between the number of shutdowns and gas production. The more shutdowns, the greater the impact on gas production. The drain-age and production phases of CBM wells are divided into six parts: test pumping stage, balanced water production stage, pressure holding stage, production increase stage, stable production stage, and decay stage. This research has important reference value for guiding the efficient development ofcoalbed me-thane.
