LI Jingming; LIU Fei; WANG Hongyan; ZHOU Wen; LIU Honglin; ZHAO Qun; LI Guizhong and WANG Bo
, 2008, 35(1): 1566-0.
Abstract (
)
Download PDF (
)
Knowledge map
Save
The desorption characteristics of coal beds in China are affected by many factors. The desorption ratio of coalbed gas is about 40%, and mostly less than 70%, and it is affected by gas content and coal bed pressure. Most of the desorption time values are between 0.188 3 to 19.17d, and the time span of high rank coal is the biggest which can reach over 30d. The value has a positive correlation with coal rank. A great number of experimental data shows that temperature, coal dimension and shape, coal rank, ash content, gas content, cleat, sediment environment, and coal style are the main affecting factors of desorption time. According to the numerical simulation result, coal desorption volume affects the single well production, and the single well output has a positive correlation with the desorption. The variation of coal desorption time value can induce the change of output peak value of a single well and its occurring time.