Application Status and Improvement of Coal Bed Methane Development Technology

In order to solve the low average drainage and recovery rate of the coal bed methane in China,the paper had an analysis on the reservoir features and mining technology.Based on the circumstances,the paper discussed the suitability of the different development method and the special geological conditions as well as t he advantages of the each new development technology.The study held that "low content saturation,low permeability and low reservoir pressure" features of the coal re servoir and the poor suitability of the available development technology were the main two causes to the low drainage and recovery rate of the coal bed methane in Chi na.The casing(fracturing) completion,ultra short radius horizontal well and multi branch horizontal well comprehensive operation could be the main modes of the coal be d methane development in China.The analysis held that the mixed gas injection for gas production increased,multi power pulse loading fracturing,nitrogenase, virtual pro duction layer and each new development technology could be applied to improve the drainage and recovery rate of the coal bed methane in China and to realize the hig h efficient development.