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A new approach for modeling adsorption kinetics and transport of methane and carbon dioxide in shale
AIChE Journal ( IF 3.5 ) Pub Date : 2022-01-05 , DOI: 10.1002/aic.17578
Min Gu 1 , Xu‐fu Xian 1 , Beizeng Miao 1 , Xushong Chen 1 , Xidong Du 1 , Zhengyang Liu 1 , Ran Xu 1
Affiliation  

In this article, a new approach is proposed to investigate adsorption kinetics and transport of gases in shale. Due to co-existence of pores with different size in the shale, a set of adsorption processes happened in pores of different sizes are considered. A first-order multi-process model is developed, which can perfectly fit the adsorption kinetic data of CH4 and CO2 obtained at different temperatures. The modeling and pore characterization results indicate that an adsorption process happens in micropores/mesopores (<50 nm) and another adsorption process happens in macropores (>50 nm) in the Wufeng shale. Gas diffusion mechanism is dominant in micropores/mesopores, and gas seepage mechanism is dominant in macropores. The effective diffusivity of CO2 is smaller than that of CH4, because the adsorption of large amount of CO2 in the pores hinders its diffusion. The coefficients related to the diffusion and seepage have no obvious trend with temperature.

中文翻译:

一种模拟页岩中甲烷和二氧化碳的吸附动力学和迁移的新方法

在本文中,提出了一种研究页岩中气体的吸附动力学和传输的新方法。由于页岩中不同大小的孔隙共存,因此考虑了在不同大小的孔隙中发生了一组吸附过程。建立了一阶多过程模型,可以完美拟合不同温度下获得的CH 4和CO 2的吸附动力学数据。建模和孔隙表征结果表明,五峰页岩在微孔/中孔(<50 nm)中发生吸附过程,在大孔(>50 nm)中发生吸附过程。微孔/中孔以气体扩散机制为主,大孔以气体渗流机制为主。CO 2的有效扩散率小于CH 4,因为大量CO 2在孔中的吸附阻碍了其扩散。与扩散和渗流相关的系数随温度变化趋势不明显。
更新日期:2022-01-05
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