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To determine the main controlling factors of the coalbed methane (CBM) development effect, 64 production wells were selected from the Mabidong Block as the study objective. Three aspects of the main controlling factors that affect production were analyzed: the reservoir geological conditions, the engineering construction quality and the drainage and production system. In addition, two new parameters, i.e., the resource index and the desorption index, were defined to better evaluate the influence laws of geological conditions on production. This study indicates that the resource index, the desorption index and the master fracture density are well correlated to stable gas production. Furthermore, fracturing is an effective way to improve the CBM development effect, but it must be based on the presence of adequate resources. Finally, the drainage and production intensity is strongly correlated with production, and the optimum value of drainage and production intensity for the Mabidong Block is 6∼7 m/d.

Analysis of the Main Controlling Factors of the Development Effect of a Single Well for Coalbed Methane