Hydrogeology exerts a major effect on the enrichment and productivity of coalbed methane (CBM). In view of the productivity difference in CBM wells with different water production levels in Xinjiang, this work conducted statistical analysis and numerical simulation to divide the CBM wells into three types, i. e., low water-producing, medium water-producing and high water-producing CBM wells. Those wells with an average daily water production of < 5 m3 for 500 days were classified as low water-producing wells. This type of wells has a moderate pressure drop (the pressure drop of the well CS18 is 51.56%), a limited range of pressure degradation and absorption, and the gas supply area is small. The CBM wells with an average daily water production of 5~10 m3 are divided into medium water-producing wells. These wells have a moderate pressure drop (the pressure drop of the well BCS-22 is 53.67%), and rarely encounter the situation that the water production is too large to be desorbed by long-term drainage. CBM wells with an average daily water production of more than 10 m3 are classified as high-yield wells. The pressure drop of such wells is small (the pressure drop of wells T1-6 is 30.42%), and the drainage and pressure reduction are difficult. Further suggestions were put forward for the CDM wells, including "reasonable water control and appropriate pressure holding" for low water-producing wells, "continuous production and stable water and pressure" for medium water-producing wells, and "daily decrease in low casing pressure and high flow pressure" for high water-producing wells. This study can provide a basis for the long-term and efficient development of CBM wells with different water production levels in Xinjiang.

（4）coalbed methane  /  reservoir drainage  /  water production  /  bottomhole flow pressure  /  drainage system  /  Xinjinag