CH4/CO2在SiO2孔隙中的吸附和扩散性能研究
Adsorption and Diffusion Properties of CH4/CO2 in SiO2 Pores
李田田 1王淑彦 1邵宝力 1陈曦 1查许晴1
作者信息
- 1. 东北石油大学提高油气采收率教育部重点实验室,黑龙江大庆 163318
- 折叠
摘要
在模拟页岩气藏体系中研究了CH4和CO2在页岩主体矿物成分SiO2孔隙中的吸附和扩散性能.结果表明:CH4和CO2之间存在着强烈的竞争吸附,高压低温能够促进两种组分气体的吸附,但不利于其扩散行为,同时CH4比CO2更容易扩散.孔壁对CH4的吸附以非键相互作用为主,CO2争夺吸附位点的行为可以有效抑制CH4的吸附,而随着CO2占比的增加,抑制效果更加显著.CO2和CH4在孔隙中的吸附行为均是典型的物理吸附,且CO2具有更高的平均等量吸附热.
Abstract
Competitive adsorption and diffusion properties of CH4 and CO2 in SiO2 pores were studied in a simulated shale gas reservoir system. The results showed that there was strong competitive adsorption between CH4 and CO2, and the high pressure and low temperature could promote the adsorption of the two-component gases, but it was not conducive to their diffusion behavior, while CH4 was easier to diffuse than CO2. The adsorption of CH4 by the pore wall was dominated by non-bonded interactions, and the behavior of CO2 competing for adsorption sites could effectively inhibit the adsorption of CH4, and the inhibition effect was more significant as the percentage of CO2 increased. The adsorption behavior of both CO2 and CH4 in the pores was typical physical adsorption, and CO2 had a higher average isosteric heat of adsorption.
关键词
页岩气/CO2/吸附/扩散Key words
Shale gas/CO2/Adsorption/Diffusion引用本文复制引用
基金项目
国家自然科学基金资助项目(51876032)
黑龙江省自然科学基金资助项目(ZD2019E002)
出版年
2024
NETL
NSTL
万方数据