放大流体花在地质介质中二氧化碳封存的结果

IF 2.7 3区 工程技术 Q3 ENGINEERING, CHEMICAL
A. R. Kovscek, J. M. Nordbotten, M. A. Fernø
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引用次数: 0

摘要

建立了描述盐水储层中不溶但可溶的二氧化碳(CO2)置换盐水的偏微分方程,包括二氧化碳-盐水界面上的传质。假设在注入过程中,二氧化碳的自由相迁移主要由压力驱动的流动来实现,则可以找到实验室和代表性储层条件下特征时间的比例关系。这意味着,FluidFlower(室内尺度可视模型)中的一小时可缩放为储层中的数百年时间。缩放标准允许推断参数和操作条件变化的影响。相间传质使二氧化碳在盐水相中达到饱和,而这种传质的有限时间导致需要大量时间来接近平衡。实验发现,溶解到地层盐水中的二氧化碳与原始盐水有明显的混合,预测也是如此。加强二氧化碳混合的浮力驱动指的起始时间通常只是二氧化碳注入时间的一小部分,与文献中的理论分析基本一致。同样,对代表性储层条件下对流混合开始时间的预测也表明,在某些情况下,指状混合的开始时间大大小于二氧化碳注入的持续时间。这一观察结果的含义包括:二氧化碳与盐水的混合以及随后由于重力作用而产生的沉降相对较快,并且与二氧化碳的有效注入时间相吻合。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Scaling Up FluidFlower Results for Carbon Dioxide Storage in Geological Media

Scaling Up FluidFlower Results for Carbon Dioxide Storage in Geological Media

Scaling Up FluidFlower Results for Carbon Dioxide Storage in Geological Media

The partial differential equations describing immiscible, but soluble, carbon dioxide (CO2) displacement of brine in saline storage formations are developed including mass transfer across the CO2–brine interface. Scaling relationships for characteristic time among laboratory and representative storage formation conditions are found upon assumption that free-phase CO2 transport during injection is dominated by pressure-driven flow. The implication is that an hour in the FluidFlower (room-scale visual model) scales to hundreds of years of elapsed time in the storage formation. The scaling criteria permit extrapolation of the effects of changes in parameters and operating conditions. Interphase mass transfer allows CO2 to saturate the brine phase and the finite time of such mass transfer results in substantial time to approach equilibrium. Significant mixing of CO2 dissolved into formation brine with original brine is found experimentally and is also predicted. The magnitude of onset time for buoyancy-driven fingers that enhance mixing of CO2 is typically only a fraction of the duration of CO2 injection and in general agreement with theoretical analysis in the literature. Predictions for onset time of convective mixing at representative storage formation conditions, likewise, teach that the onset time for fingering is significantly less than the duration of CO2 injection in some cases. The implications of this observation include that mixing of CO2 with brine and the subsequent settling due to gravity are relatively rapid and coincide with the period of active CO2 injection.

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来源期刊
Transport in Porous Media
Transport in Porous Media 工程技术-工程:化工
CiteScore
5.30
自引率
7.40%
发文量
155
审稿时长
4.2 months
期刊介绍: -Publishes original research on physical, chemical, and biological aspects of transport in porous media- Papers on porous media research may originate in various areas of physics, chemistry, biology, natural or materials science, and engineering (chemical, civil, agricultural, petroleum, environmental, electrical, and mechanical engineering)- Emphasizes theory, (numerical) modelling, laboratory work, and non-routine applications- Publishes work of a fundamental nature, of interest to a wide readership, that provides novel insight into porous media processes- Expanded in 2007 from 12 to 15 issues per year. Transport in Porous Media publishes original research on physical and chemical aspects of transport phenomena in rigid and deformable porous media. These phenomena, occurring in single and multiphase flow in porous domains, can be governed by extensive quantities such as mass of a fluid phase, mass of component of a phase, momentum, or energy. Moreover, porous medium deformations can be induced by the transport phenomena, by chemical and electro-chemical activities such as swelling, or by external loading through forces and displacements. These porous media phenomena may be studied by researchers from various areas of physics, chemistry, biology, natural or materials science, and engineering (chemical, civil, agricultural, petroleum, environmental, electrical, and mechanical engineering).
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