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Shale gas transport mechanisms in inorganic and organic pores based on lattice Boltzmann simulation

机译：基于格子玻璃晶型仿真的无机和有机孔中的页岩气输送机制

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A better understanding on the mechanism and difference of shale gas transport through inorganic and organic pores is critical to accurately predicting shale gas recovery. Due to the complicated gas flow dynamics in such narrow pores, traditional experimental methods or simulation methods is difficult to accurately describe these processes. Here, a regularized lattice Boltzmann (LB) model coupled with the slippage boundary condition and gas adsorption effect is employed to simulate shale gas transport in the inorganic and organic pore. The adsorption parameters of shale gas in the LB model are obtained from the molecular dynamics (MD) simulations. Effects of the adsorption effect, pore size, pore wall roughness and gas rarefaction effect on the shale gas transport are studied. The simulation results show that the shale gas transport mechanism heavily depends on the pore size. Basically, in the nano-scale pore, the gas slippage and Knudsen flow are the dominated transport mechanism, but the gas transport is dominated by the surface diffusion in the organic pore width with less than 5?nm owing to the gas adsorption effect. The surface roughness effect plays an important role in the gas transport, and this effect significantly increases with the decreasing of the Knudsen number. At the same time, the gas adsorption effect can also cause a significant increase of the friction factor and a slight decrease of the mass flow rate, which indicates that the gas adsorption effect must be considered in the organic roughness pores.
机译：更好地了解通过无机和有机孔的页岩气输送机理和差异对于准确地预测页岩气回收至关重要。由于这种狭窄孔隙中的气流动力学复杂，传统的实验方法或模拟方法难以准确地描述这些过程。这里，采用与滑动边界条件和气体吸附效果联接的正则化晶格Boltzmann（LB）模型来模拟无机和有机孔中的页岩气输送。 LB模型中页岩气的吸附参数从分子动力学（MD）模拟中获得。研究了吸附效应，孔径，孔隙壁粗糙度和气体稀疏对页岩气运输的影响。仿真结果表明，页岩气输送机制严重取决于孔径。基本上，在纳米尺度孔隙中，气体滑动和knudsen流量是主导的运输机制，但由于气体吸附效果，气体传输在有机孔宽度中的表面扩散在有机孔宽度下导为主导。表面粗糙度效应在气体运输中起着重要作用，并且随着knudsen号的降低，这种效果显着增加。同时，气体吸附效果也可能导致摩擦因子的显着增加和质量流量略微降低，这表明必须在有机粗糙度孔中考虑气体吸附效果。

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