带底部含水层的枯竭气藏中密度驱动的二氧化碳溶解

Energies Pub Date : 2024-07-16 DOI:10.3390/en17143491
Xiaocong Lyu, Fang Cen, Rui Wang, Huiqing Liu, Jing Wang, Junxi Xiao, Xudong Shen
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引用次数: 0

摘要

带有底水的枯竭气藏显示出长期封存二氧化碳的巨大潜力。残余气体会影响质量传递动力学,进一步影响多孔介质中的二氧化碳溶解和对流。在本研究中,我们进行了一系列数值模拟,以探索残余气体混合物如何影响二氧化碳溶解捕集。此外,我们还分析了不同阶段的二氧化碳溶解速率,并描述了对流的起始和衰退与气体成分的关系,从而量化了残余气体混合物的影响。研究结果表明,在包含 CTZ 的合成模型中观察到的舍伍德数的时间演变与单相模型密切相关,但数量级明显更高。CTZ 的引入增强了重力对流,加快了二氧化碳的溶解,而残余气体混合物的存在则对传质产生了有害影响。残余气体含量的增加会同时降低二氧化碳的分压和溶解度。因此,饱和水和淡水之间的浓度和密度差减小,导致二氧化碳扩散和对流的驱动力减弱。这导致主要受重力诱导的指状作用影响的二氧化碳溶解速率大大降低,从而表现为对流开始和衰减时间的延迟,并伴随着最大舍伍德数的明显下降。在油田尺度模拟中,注入的二氧化碳提高了储层压力,进一步将更多气体推向生产者。然而,由于注入后过程中存在 CH4,二氧化碳的溶解能力降低。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Density-Driven CO2 Dissolution in Depleted Gas Reservoirs with Bottom Aquifers
Depleted gas reservoirs with bottom water show significant potential for long-term CO2 storage. The residual gas influences mass-transfer dynamics, further affecting CO2 dissolution and convection in porous media. In this study, we conducted a series of numerical simulations to explore how residual-gas mixtures impact CO2 dissolution trapping. Moreover, we analyzed the CO2 dissolution rate at various stages and delineated the initiation and decline of convection in relation to gas composition, thereby quantifying the influence of residual-gas mixtures. The findings elucidate that the temporal evolution of the Sherwood number observed in the synthetic model incorporating CTZ closely parallels that of the single-phase model, but the order of magnitude is markedly higher. The introduction of CTZ serves to augment gravity-induced convection and expedites the dissolution of CO2, whereas the presence of residual-gas mixtures exerts a deleterious impact on mass transfer. The escalation of residual gas content concomitantly diminishes the partial pressure and solubility of CO2. Consequently, there is an alleviation of the concentration and density differentials between saturated water and fresh water, resulting in the attenuation of the driving force governing CO2 diffusion and convection. This leads to a substantial reduction in the rate of CO2 dissolution, primarily governed by gravity-induced fingering, thereby manifesting as a delay in the onset and decay time of convection, accompanied by a pronounced decrement in the maximum Sherwood number. In the field-scale simulation, the injected CO2 improves the reservoir pressure, further pushing more gas to the producers. However, due to the presence of CH4 in the post-injection process, the capacity for CO2 dissolution is reduced.
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