Shale reservoirs have the characterizations of low porosity, low permeability, and hydrocarbon organic matter self-generation and self-storage, resulting in its complex flow mechanisms. Compared with fractured vertical wells, multiple-fractured horizontal wells are widely used due to their advantages of effectively increasing the well control range and further expanding the drainage area. To further study the multiscale flow mechanisms of shale gas, a flow model was established that considered viscous flow in microfractures and inorganic pores, the diffusion of Knudsen in nanoscale porosity, the coexistence of slippage, adsorption-desorption effects under infinity, and closed outer boundary conditions; based on the continuous point source solution, a multiple-fractured horizontal well flow model was established and solved by MATLAB programming. Then, the effects of various factors were investigated. The results show that the Knudsen diffusion and slippage coefficients mainly affect the apparent permeability of the matrix pores. The more the Knudsen diffusion and slippage coefficients are, the earlier the turbulent flow occurs and the higher the gas production is.

中文翻译：

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页岩气藏多机理水平机制多口水平井瞬态渗流理论

页岩储集层具有低孔隙度，低渗透率和烃类有机物自生自储的特征，导致其复杂的流动机制。与压裂垂直井相比，多压裂水平井具有有效增加井控范围，进一步扩大排水面积等优点。为了进一步研究页岩气的多尺度流动机理，建立了考虑微裂缝和无机孔隙中的粘性流动，纳努森在纳米级孔隙中的扩散，滑动的共存，无穷远处的吸附-解吸效应以及封闭外边界的流动模型。条件; 基于连续点源解，建立了多裂缝水平井流模型，并通过MATLAB编程进行求解。然后，研究了各种因素的影响。结果表明，Knudsen扩散系数和滑动系数主要影响基质孔隙的表观渗透率。Knudsen扩散系数和滑动系数越大，湍流越早发生，并且产气量越高。