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Insights into recovery of multi-component shale gas by CO_2 injection: A molecular perspective

机译：CO_2注射用CO_2注射回收多分量页岩气的见解：分子视角

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摘要

Understanding the mechanism behind shale gas recovery is of great importance for achieving optimum shale gas productivity. In this work, we use Grand Canonical Monte Carlo (GCMC) simulations to investigate the adsorption and recovery mechanisms of ternary hydrocarbon mixtures comprising methane, ethane and propane in kerogen nanopores. For the adsorption of hydrocarbon mixtures in kerogen slit pores, density distributions of each component are analyzed and the results indicate that densities of methane and ethane in the first adsorption layer increase as pressure increases, while an opposite trend is observed for propane. A stronger confinement effect is observed on the heavier hydrocarbon components, increasing the difficulty of recovery. For the recovery of the multi-component shale gas, we propose a reference recovery route with pressure drawdown and CO2 injection combined and the recovery efficiency is compared to the condition with only pressure drawdown applied. Significant enhancement in recovery ratio for all three components is observed with the CO2 injection and a better performance is shown on heavier components and smaller pores. An increase of 60% and 40% in propane recovery ratio is achieved in the 2-nm and 4-nm kerogen slit pores, respectively. Recovery mechanisms of pressure drawdown and CO2 injection are investigated in detail. The pressure drawdown method recovers methane from the first adsorption layer and middle of slit pore simultaneously, while extracting ethane and propane mainly from the middle of slit pore; the recovery due to CO2 injection mainly takes place in the adsorption layers. Pressure drawdown tends to extract the lighter components and CO2 injection is efficient in the recovery of heavier hydrocarbons. As pore width increases, the recovery ratio of pressure drawdown increases, while that of CO2 injection decreases. Besides, the CO2 sequestration ratio is higher in smaller kerogen slit pores.
机译：了解页岩气体回收后的机制对于实现最佳页岩气生产率非常重要。在这项工作中，我们使用Grand Canonical Monte Carlo（GCMC）模拟来研究三元烃混合物在Kerogen Nanopores中包含甲烷，乙烷和丙烷的三元烃混合物的吸附和回收机制。为了吸附在Kerogen狭缝孔中的烃混合物，分析了每个组分的密度分布，结果表明，由于压力增加，第一吸附层中的甲烷和乙烷的密度随着压力而增加，而丙烷观察到相反的趋势。在较重的烃组件上观察到更强的限制效果，增加了恢复的难度。为了回收多分量页岩气，我们提出了一种带压力拉伸的参考恢复路线，并将恢复效率与施加的压力拉伸的条件进行比较。用CO 2注射观察到所有三种组分的回收率的显着提高，并且在较重的成分和较小的孔上显示了更好的性能。丙烷回收率的增加分别在2-NM和4nm Kerogen Slit孔中实现了60％和40％。详细研究了压力拉伸和CO2注射的恢复机制。压力拔压法同时恢复来自第一吸附层和狭缝孔中间的甲烷，同时主要从狭缝孔的中间提取乙烷和丙烷;由于CO2注射引起的恢复主要发生在吸附层中。压力缩小倾向于提取较轻的组分，CO 2注射在较重的烃的回收中有效。随着孔宽度的增加，压力拉伸的回收率增加，而CO2注射的回收率降低。此外，CO 2螯合率较小的CO 2螯合尺寸较高。

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  • 来源
    《Fuel》 |2020年第may1期|117247.1-117247.11|共11页
  • 作者

    Zhou Juan; Jin Zhehui; Luo Kai H.;

  • 作者单位

    Tsinghua Univ Ctr Combust Energy Dept Energy & Power Engn Key Lab Thermal Sci & Power Engn Minist Educ Beijing 100084 Peoples R China|Univ Alberta Sch Min & Petr Engn Dept Civil & Environm Engn Edmonton AB T6G 1H9 Canada;

    Univ Alberta Sch Min & Petr Engn Dept Civil & Environm Engn Edmonton AB T6G 1H9 Canada;

    UCL Dept Mech Engn Torrington Pl London WC1E 7JE England;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    GCMC simulation; Multi-component shale gas; Adsorption; Shale gas recovery; CO2 sequestration;

    机译：GCMC仿真;多组分页岩气;吸附;页岩气回收;CO2封存;

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