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首页> 外文期刊>Bulletin of the American Physical Society >APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - Storage and recovery of methane-ethane mixtures in single shale pores.
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APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - Storage and recovery of methane-ethane mixtures in single shale pores.

机译：APS-流体动力学APS部门第70届年会-活动-在单页岩孔中储存和回收甲烷-乙烷混合物。

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Natural gas production from shale formations has received extensive attention recently. While great progress has been made in understanding the adsorption and transport of single-component gas inside shales' nanopores, the adsorption and transport of multicomponent shale gas under reservoir conditions (CH4 and C2H6 mixture) has only begun to be studied. In this work, we use molecular simulations to compute the storage of CH4 and C2H6 mixtures in single nanopores and their subsequent recovery. We show that surface adsorption contributes greatly to the storage of CH4 and C2H6 inside the pores and C2H6 is enriched over CH4. The enrichment of C2H6 is enhanced as the pore is narrowed, but is weakened as the pressure increases. We show that the recovery of gas mixtures from the nanopores approximately follows the diffusive scaling law. The ratio of the production rates of C2H6 and$_{mathrm{hinspace }}$CH4 is close to their initial mole ratio inside the pore despite that the mobility of pure C2H6 is much smaller than that of pure CH4 inside the pores. By using scale analysis, we show that the strong coupling between the transport of CH4 and C2H6 is responsible for the effective recovery of C2H6 from the nanopores.
机译：页岩地层的天然气生产近来受到广泛关注。尽管在了解页岩纳米孔内单组分气体的吸附和迁移方面已取得了很大进展，但在储层条件下（CH4和C2H6混合物）多页岩气的吸附和迁移才刚刚开始研究。在这项工作中，我们使用分子模拟来计算CH4和C2H6混合物在单个纳米孔中的存储量以及随后的回收率。我们表明，表面吸附极大地促进了CH4和C2H6在孔中的存储，并且C2H6比CH4富集。 C2H6的富集随着孔的变窄而增强，但随着压力的增加而减弱。我们表明，从纳米孔中回收气体混合物大致遵循扩散尺度定律。尽管纯C2H6的迁移率比纯CH4的迁移率小得多，但C2H6和$ _ {mathrm {hinspace}} $ CH4的生产率之比接近其在孔内的初始摩尔比。通过使用规模分析，我们表明CH4和C2H6的运输之间的强耦合负责从纳米孔中有效回收C2H6。

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