Shezhan Liu , Yi Zhang , Yuechao Zhao , Zhiguo Wang , Yongchen Song , Junchen Lv
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引用次数: 0
摘要
对孔隙空间中置换流体和甲烷的时空分布模式进行直观描述,并探索对甲烷的扫描效应差异,是预测储层中二氧化碳地质封存规模和生产能力的关键。不同成分的置换流体对孔隙空间中 CH4 的置换效率存在很大差异。本研究以二氧化碳封存和提高天然气采收率为基础,探讨了更具成本效益的置换流体注入方案。因此,研究了二氧化碳、混合气体(50 % CO2 + 50 % N2)和 N2 在孔隙尺度上的置换行为和分散特性。在置换过程中,N2 的整体清扫效率最高,但它也会造成最大程度的混合。相比之下,液态和超临界 CO2 的扩散能力最弱,对 CH4 的总体清扫效率最低,但造成的混合程度最小。此外,研究还发现,随着压力的增加,三种置换流体的分散系数都会变小,其中入口/出口效应会使 CO2 的分散系数增加 11.3% 至 23.4%。
Study of displacement behavior and dispersion characteristics based on low-field NMR in the context of CO2 geological sequestration and enhanced methane recovery
Visual characterization of the spatial and temporal distribution patterns of displacing fluids and CH4 within the pore space and exploration of the differences in sweep effect on CH4 are key to predicting the scale of CO2 geological sequestration and production capacity within the reservoir. There are large differences in the displacement efficiency of CH4 in the pore space by different components of the displacing fluid. In this study, the more cost-effective displacing fluid injection scheme is explored on the basis of CO2 sequestration and enhanced gas recovery. Thus, the displacement behavior and dispersion characteristics of CO2, gas mixture (50 % CO2 + 50 % N2) and N2 at the pore scale are investigated. N2 has the highest overall sweep efficiency during displacement, but it also causes the greatest degree of mixing. In contrast, liquid and supercritical CO2 has the weakest diffusion ability and the lowest overall sweep efficiency on CH4, but cause the least mixing. In addition, it is found that the dispersion coefficients of all three displacing fluids become smaller with increasing pressure, with the entrance/exit effect causing the CO2 dispersion coefficients to increase by 11.3 % to 23.4 %.
期刊介绍:
The exploration of energy sources remains a critical matter of study. For the past nine decades, fuel has consistently held the forefront in primary research efforts within the field of energy science. This area of investigation encompasses a wide range of subjects, with a particular emphasis on emerging concerns like environmental factors and pollution.