不同条件下煤层注水效果数值模拟分析

Numerical Simulation Analysis on Water Injection Effect of Coal Seam under Different Conditions

为了研究深部不同条件下煤层的注水效果,通过实验室实验与数值模拟相结合的方法,研究煤层可注性和不同条件下的注水效果。可注性实验结果显示:煤样同时满足W≤4%、n≥4%、δ≥1%和f≥0.4,判定模拟煤层具有可注性。孔径增大,渗透半径也随之增大。埋深增大,渗透半径相应减小,但变化幅度不大,说明埋深对注水渗透半径影响不大。渗透时间增加时,渗透半径也随之增大,说明增加钻孔注水时间可增大其渗透范围。

To study water injection effect of coal seam under different conditions in the deep, by the method of combining laboratory experiment and numerical simulation, study the water injection effect under different conditions and injectivity of coal seam. The experimental results of injeetivity show that the coal samples meet the W≤4%, n≥4%, δ≥1% and f≥0.4,at the same time, it is found that the simulated coal seam has the injectivity. As the borehole diameter increases, the permeability radius increases. The buried depth increases, and the permeability radius decreases, but the change amplitude is small, which indicates that the buried depth has little influence on the permeability radius of water injection. When the penetration time increases, the permeability radius increases, which indicates that increasing the time of borehole water injection can increase the penetration range