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首页> 外文期刊>International Journal of Greenhouse Gas Control >Well injectivity during CO2 storage operations in deep saline aquifers - Part 2: Numerical simulations of drying, salt deposit mechanisms and role of capillary forces
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Well injectivity during CO2 storage operations in deep saline aquifers - Part 2: Numerical simulations of drying, salt deposit mechanisms and role of capillary forces

机译：深层盐水中CO2储存过程中的油井注入能力-第2部分：干燥，盐沉积机理和毛细作用的数值模拟

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摘要

The injection of CO2 into geological reservoirs or deep saline aquifers is being studied to control global warming by limiting greenhouse gas emissions. CO2 is captured from exhaust gases in power plants or industrial units and stored in underground geological reservoirs. Return on experience with CO2 injection in the oil industry clearly shows that injectivity problems can be encountered due to several mechanisms including mineral dissolution/precipitation and physical alteration due to the complete desaturation of the near-wellbore zone. This study describes numerical modelling that is able to reproduce the experimental results of drying of brine-saturated sandstone cores by gas injection in the laboratory. The evolution of water and gas saturation profiles and the precipitation of salt inside the samples are followed with injection time. Numerical results agree well with experimental observations highlighting the key role played by capillary forces during the desiccation process (see the companion paper; Peysson et al., 2014). A tentative extrapolation of experimental results from laboratory scale to the near-well field scale is proposed. This approach is of major importance because it makes it possible to determine the optimal CO2 injection flow rate according to both the intrinsic petrophysical properties of the porous medium and initial brine salinities
机译：正在研究将二氧化碳注入地质储层或深层盐水层，以通过限制温室气体排放来控制全球变暖。从发电厂或工业单位的废气中捕获CO2，并将其存储在地下地质储层中。在石油工业中注入二氧化碳的经验的回顾清楚地表明，由于几种机制可能会遇到注入问题，包括矿物溶解/沉淀以及由于近井眼区域完全脱饱和而引起的物理变化。这项研究描述了数值模型，该模型能够再现在实验室中通过注气对盐水饱和的砂岩岩心进行干燥的实验结果。注入时间跟随水和气饱和度曲线的演变以及样品内部盐的沉淀。数值结果与实验观察非常吻合，突出了干燥过程中毛细作用力的关键作用（请参见随附论文; Peysson等人，2014）。提出了从实验室规模到近井现场规模的实验结果的初步推断。这种方法非常重要，因为它可以根据多孔介质的固有岩石物理特性和初始盐度确定最佳的二氧化碳注入流速

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