Model for Surface Diffusion of Adsorbed Gas in Nanopores of Shale Gas Reservoirs

Model for Surface Diffusion of Adsorbed Gas in Nanopores of Shale Gas Reservoirs
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页岩气藏纳米孔吸附气体表面扩散模型

DOI:
10.1021/ie504030v
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发表时间:
2015-03
影响因子:
4.2
通讯作者:
Chen Zhangxin
Chen Zhangxin
中科院分区:
工程技术3区
文献类型:
--
作者:
Wu Keliu;Li Xiangfang;Wang Chenchen;Yu Wei;Chen Zhangxin

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页岩气储层中大量的有机质纳米孔隙中吸附了大量的天然气,因此表面扩散在天然气传质过程中起着关键作用。由于页岩气藏储层压力高、表面非均质性强、非等温解吸等特点,使得表面扩散模拟非常复杂。本文在低压条件下推导的Hwang模型基础上,考虑高压条件下吸附气覆盖度的影响,建立了页岩气藏吸附气表面扩散的新模型。此外,这个新的模型考虑了表面异质性,等量吸附热,和非等温气体解吸的影响。结果表明:(1)表面扩散系数随压力和温度的升高而增大,随活化能和气体分子量的增加而减小;(2)粘性流、努森扩散和表面扩散对气体总传质的贡献在页岩气发展过程中是变化的。
Surface diffusion plays a key role in gas mass transfer due to the majority of adsorbed gas within abundant nanopores of organic matter in shale gas reservoirs. Surface diffusion simulation is very complex as a result of high reservoir pressure, surface heterogeneity, and nonisothermal desorption in shale gas reservoirs. In this paper, a new model of surface diffusion for adsorbed gas in shale gas reservoirs is established, which is based on a Hwang model derived under a low pressure condition and considers the effect of adsorbed gas coverage under high pressure. Additionally, this new model considers the effects of surface heterogeneity, isosteric sorption heat, and nonisothermal gas desorption. Results show that (1) the surface diffusion coefficient increases with pressure and temperature, while it decreases with activation energy and gas molecular weight; (2) contributions of viscous flow, Knudsen diffusion, and surface diffusion to the total gas mass transfer are varying during the development of shal...
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