论文部分内容阅读
基于双重介质煤体中的瓦斯流动机理,考虑瓦斯在煤基质内的解吸、运移、释放及其在裂隙内的流动过程,建立了双重介质煤体钻孔瓦斯双渗流数学模型,并运用有限差分法编制了数值模拟程序.结果表明:煤基质内瓦斯压力呈非均匀分布,且其下降速率远小于裂隙;距钻孔壁的距离不同,煤基质表现出不同的瓦斯解吸特征.通过对比模拟结果与现场实测数据,验证了双重介质煤体钻孔瓦斯双渗流模型的正确性,同时表明该模型较传统的连续介质模型有更好的适用性.
Based on the gas flow mechanism in the dual-medium coal and considering the gas desorption, migration and release in the coal matrix and its flow in the fracture, a mathematic model of gas-oil dual seepage with dual-medium coal bores was established. Differential method was used to simulate the coal bed.The results show that the gas pressure in the coal matrix is inhomogeneous and its rate of descent is far less than that of the fractures.The coal matrix shows different gas desorption characteristics due to the different distance from the borehole wall.By contrast simulation Results and field measurements validate the correctness of the dual-media coal-bed gas-seepage dual-seepage model and show that the model is more suitable than the traditional continuum model.