In order to solve the problems such as coal blockage and low gas production of coalbed methane wells in the Southern Yanchuan block

an application test of controlled shock wave plugging removal and permeability improvement technology is carried out. Therefore

four typical wells are selected to analyze the geological and engineering parameters in the construction process

as well as comparative analysis of the gas and water production before and after the implementation. The results show that the application of controllable shock wave plugging removal and permeability improvement technology in coalbed methane wells can improve liquid fluidity

promote gas desorption and diffusion

and remove plugging in coal reservoirs. The well selection criteria of this technology are low coalbed fracture pressure

good fracturing effect

including dirt band

high gas-bearing capacity of coalbed

relatively high formation pressure coefficient

etc. This technology has the effect of creating fractures and removing plugs

which can improve the fluidity of formation fluids and remove formation pollution. It has a good implementation effect and application prospect in the near-well zone of south Yanchuan coalbed methane wells to plugging removal and increase gas production

and is expected to be a new stimulation technology for low yield and efficiency wells.