Selection of CBM drilling completion methods by hierarchical analysis

Scientific drilling completion method may make coal-bed methane being produced at high efficiency. The coal geologic parameters play an important role in the selection of drilling completion methods. The parameters can be classified into geometric parameters and physical parameters. The hierarchical structure of drilling completion methods is established by hierarchical analysis. the weighting of the parameters on the drilling completion selection is calculated by counting the occurrence frequency of the parameters in literatures at home and abroad. In the basis of hierarchical analysis results and field applications, the different drilling completion methods are obtained in accordance with different geological conditions. the method is applied in Jincheng, Baode block and Yushe-Miluo district, and the drilling completion methods are selected for the zones above.