Recovery of Multicomponent Shale Gas from Single Nanopores
Recovery of Multicomponent Shale Gas from Single Nanopores
复制标题
DOI：
10.1021/acs.energyfuels.7b01013
复制
发表时间：
2017-07
期刊：
影响因子：
5.3
通讯作者：
Haiyi Wu;Yadong He;R. Qiao
中科院分区：
文献类型：
--
作者：
Haiyi Wu;Yadong He;R. Qiao
页岩地层中多组分混合气的吸附及其开采是页岩气工业的一大研究课题。在这里，我们报告了甲烷/乙烷混合物在2和4纳米宽的纳米孔中的吸附及其从这些纳米孔中回收的分子动力学模拟。表面吸附对甲烷和乙烷在纳米孔内的储存有显著的促进作用，乙烷在纳米孔内以大量甲烷-乙烷混合物的平衡富集。随着孔隙的缩小，乙烷的富集增强，但由于熵效应，随着压力的增加，乙烷的富集减弱。理想吸附溶液（IAS）理论捕捉到了这些效应，但该理论高估了两种气体的吸附。在打开纳米孔的口，以较低的压力气体浴，两种气体进入浴。在气体扩散前缘到达孔隙的死端之前，两种气体的产率与平方根标度定律只有微弱的偏差。的比率…
The adsorption of multicomponent gas mixtures in shale formations and their recovery are of great interest to the shale gas industry. Here we report molecular dynamics simulations of the adsorption of methane/ethane mixtures in 2 and 4 nm-wide nanopores and their recovery from these nanopores. Surface adsorption contributes significantly to the storage of methane and ethane inside the pores, and ethane is enriched inside the nanopores in equilibrium with bulk methane–ethane mixtures. The enrichment of ethane is enhanced as the pore is narrowed but is weakened as the pressure increases due to entropic effects. These effects are captured by the ideal adsorbed solution (IAS) theory, but the theory overestimates the adsorption of both gases. Upon opening the mouth of the nanopores to gas baths with lower pressure, both gases enter the bath. The production rates of both gases show only weak deviation from the square root scaling law before the gas diffusion front reaches the dead end of the pores. The ratio of...