煤层气矿井瓦斯或矿井气的生产通常需要脱水,从而减小气井储集层压力,使吸附在煤表面的甲烷释放.甲烷解吸时形成气泡,达到饱合时气泡形成一条连续的通路,并向井筒流动.随着脱水继续进行,煤的相对渗透率出现变化,气体相的渗透能力增加,水相的减小.储集层受到的影响范围也增大.了解气井的产气机理和煤层水文特征对评价气井的生产潜力和经济开发可行性有重要价值,它可以帮助进行产气井的设计,水力压裂处理和井场排水产气. CBM Gas production in mines or mines usually requires dewatering to reduce gas reservoir pressure and release methane adsorbed on the surface of the coal, forming bubbles upon desorption of methane and forming a continuous path of gas bubbles when saturated, As the dehydration continues, the relative permeability of coal changes, the permeability of the gas phase increases and the water phase decreases, and the range affected by the reservoir also increases. Understanding the gas production mechanism of gas wells and the hydrology of coal seams Features are of great value in assessing the production potential of a gas well and the feasibility of economic development. It can assist in the design of gas wells, hydraulic fracturing treatment, and wellsite drainage and gas production.