Effects of Charged Solute-Solvent Interaction on Reservoir Temperature during Subsurface CO2 Injection
Effects of Charged Solute-Solvent Interaction on Reservoir Temperature during Subsurface CO2 Injection
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DOI：
10.3390/min12060752
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发表时间：
2022-06
期刊：
影响因子：
2.5
通讯作者：
C. Paolini
中科院分区：
文献类型：
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作者：
C. Paolini
二氧化碳注入的一个短期副作用是，由于溶质扩散系数的差异，在主体注水剂之前形成了一个正在形成的低pH锋面。对井下温度的观察表明，随着低pH值前沿的到来，水相温度降低，随后在高浓度的碳酸氢根离子到来时，温度逐渐上升。在这项工作中，我们用Helgeson-Kirkham-Flowers(HKF)模型模拟了水相的瞬时热平流和扩散，计算了溶质-溶剂相互作用的体积产能率。HKF模型是基于Born溶剂化模型的，用于计算比摩尔热容和荷电电解液的热容。计算的注入水温度分布与传感器采集的井底实际温度相吻合。地下注入模拟过程中水相温度的模拟对于准确模拟矿物溶解和沉淀是很重要的，因为向前溶解速率受温度相关的Arrhenius模型控制。
A short-term side-effect of CO2 injection is a developing low-pH front that forms ahead of the bulk water injectant, due to differences in solute diffusivity. Observations of downhole well temperature show a reduction in aqueous-phase temperature with the arrival of a low-pH front, followed by a gradual rise in temperature upon the arrival of a high concentration of bicarbonate ion. In this work, we model aqueous-phase transient heat advection and diffusion, with the volumetric energy generation rate computed from solute-solvent interaction using the Helgeson–Kirkham–Flowers (HKF) model, which is based on the Born Solvation model, for computing specific molar heat capacity and the enthalpy of charged electrolytes. A computed injectant water temperature profile is shown to agree with the actual bottom hole sampled temperature acquired from sensors. The modeling of aqueous-phase temperature during subsurface injection simulation is important for the accurate modeling of mineral dissolution and precipitation because forward dissolution rates are governed by a temperature-dependent Arrhenius model.