Dynamic parameters of CBM well drainage and relationship among them

Production system which control the CBM well output fluctuation is a key factor to ensure production successfully.Based on the production data of Panhe CBM development testing area,a comprehensive study in-cluding gas output,water output,casing pressure and dynamic water level was carried out by the method of statistic and antitheses.The result shows that there is an obvious phase characteristics for both CBM production process and dynamic parameters.In the process of CBM drainage the dynamic water level is related to casing pressure.This relationship can be used to control down well pressure.An adaptive production system to different production stages was pointed out,based on characters of dynamic parameters at every stage.