After coal seam mining,stress change and rock movement in adjacent rock strata, make permeability and other fields change in adjacent coal seam. At the same time, due to the exploitation of coal seams, material exchange may occur in the adjacent coal seams. It also caused desorption of near coal seam near the mining working face. Recent years, with the development of coalbed methane mining technology under pressure relief in mining areas, it is necessary to carry out numerical simulation under coalbed methane mining conditions to realize the optimization of coalbed methane extraction simulation under mining conditions. The coupling effect of dynamic virtual well and variable permeability field advancing with the mining face is used to simulate the output of coalbed methane under mining conditions: the dynamic virtual well is used to advance with the mining face to characterize the influence of the working face on the material exchange of adjacent coal seams in the mining process; the use of variable permeability field to realize the influence of the permeability of the adjacent coal seam during the advancement of the working face. Finally, through the dynamic coupling of variable permeability field and dynamic virtual well with the mining face, the rapid pressure relief effect of high speed and short time on the adjacent layer under the influence of mining is characterized. The simulation results of the computer simulation software written by the algorithm show that when the mining effect is not considered, that is, when the algorithm does not consider the dynamic virtual well production and the variable permeability field, it is basically consistent with the commercial software simulation results, but for the consideration of mining condition is a situation that commercial software cannot simulate, and the simulation results of this algorithm are more consistent with the actual monitoring data of the mine. This method achieves numerical simulation of CBM under mining conditions by improving the mature algorithm, which can provide effective guidance for future CBM capacity prediction under mining conditions.

煤层开采后，邻近岩层的应力变化和岩石运动，使邻近煤层的渗透率等场发生变化。同时，由于煤层的开采，相邻煤层可能发生物质交换。它还引起了开采工作面附近煤层的解吸。近年来，随着矿区卸压煤层气开采技术的发展，需要开展煤层气开采条件下的数值模拟，实现煤层气开采条件下煤层气开采模拟的优化。采用动态虚拟井与随采面推进的变渗透场耦合效应，模拟开采条件下煤层气的产出：采用动态虚拟井随工作面推进，表征工作面在开采过程中对相邻煤层物质交换的影响；利用可变渗透率场实现工作面推进过程中相邻煤层渗透率的影响。最后，通过变渗透场和动态虚拟井与工作面的动态耦合，表征了开采影响下邻层高速、短时间的快速泄压效果。该算法编写的计算机仿真软件的仿真结果表明，在不考虑开采效果时，即算法不考虑动态虚拟井产量和变渗透率场时，与商业软件模拟结果基本一致，但考虑到采矿条件是商业软件无法模拟的情况，该算法的模拟结果与矿山实际监测数据较为吻合。该方法通过对成熟算法的改进，实现了采煤条件下煤层气的数值模拟，可为未来采煤条件下煤层气产能预测提供有效指导。