瓦斯是赋存于煤层中的非常规天然气。瓦斯的输运行为是煤层气开采的核心问题，然而双重孔隙煤层的瓦斯输运机理还没有达成共识。为了明确瓦斯输运机理，可视化瓦斯动态输运过程，构建裂隙中瓦斯由压力梯度驱动、煤基质内瓦斯分别由压力梯度驱动和密度梯度驱动的2种煤层双重孔隙钻孔瓦斯渗流模型。2种模型均采用有限差分法求解。通过自主开发的数值模拟软件得到瓦斯压力分布、瓦斯涌出速度和瓦斯累计涌出量。通过对比数值解算结果与现场实测数据，探讨两种模型的准确性和差异性。结果表明：① 2种模型在抽采前期均由达西流主导，其瓦斯涌出速度和累计瓦斯涌出量与现场基本保持一致，而煤基质内的气体将在后期主导气体输运。②由于游离瓦斯的存在，基质密度梯度模型的钻孔瓦斯压力变化范围比压力梯度模型的更大，更符合现场实测情况。说明煤基质中的扩散行为更符合游离瓦斯密度梯度驱动模型。③钻孔瓦斯涌出率与原始瓦斯压力、孔隙率、裂隙渗透系数呈正相关，与基质半径负相关。所构建的裂隙瓦斯压力梯度驱动、基质游离瓦斯密度梯度驱动双重孔隙钻孔瓦斯输运模型更真实、准确地反映煤储层钻孔瓦斯输运的物理行为。

Methane is an unconventional natural gas in coal seams. Coalbed methane (CBM) migration behavior constitutes a core issue in coalbed methane extraction. However, there is no consensus on the gas migration mechanism of dual-porosity coal seams. To elucidate the mechanism of gas migration and visualize the dynamic migration process of gas, two dual-porosity borehole gas seepage models were established. Specifically, the pressure gradient drives gas in the fracture, and gas in the coal matrix is driven by the pressure gradient and density gradient respectively. The finite difference method is employed to solve both models. Through the self-developed numerical simulation software, the gas pressure distribution, gas emission velocity, and gas accumulation emission amount were obtained. By comparing the numerical results with the field-measured data, the accuracy and disparities between the two models were investigated and discussed. The results show that: ① In the initial stage of extraction, both models are predominantly governed by Darcy flow, and their gas emission velocity and cumulative gas emission quantity are substantially in consonance with the field data. In the subsequent stage, the gas within the coal matrix assumes a dominant role in gas migration. ② Due to the existence of free gas, the variation range of gas pressure in borehole in the density gradient model is larger than that in the pressure gradient model. The diffusion behavior in coal matrix is more consistent with the density gradient model in coal matrix. ③ The gas emission rate of the borehole exhibits a positive correlation with the original gas pressure, porosity, and fracture permeability coefficient, and a negative correlation with the matrix radius. The dual-porosity borehole gas transport model driven by the gas pressure gradient in fracture and free gas density gradient in coal matrix can reflect the physical behavior of borehole gas transport in coal reservoir more truly and accurately.