We investigate the dynamics of a CO₂ injection wellbore using a fully-coupled non-isothermal transient multiphase wellbore-reservoir flow model. The focus of this study is on the transient behavior of the wellbore parameters in injection tests undertaken at the CaMI Field Research Station (FRS) in Alberta, Canada. Wellbore transient pressure and temperature and subsequent CO₂ phase behavior through the wellbore were analyzed, and the impacts of the reservoir parameters on the wellbore transient flow behavior are characterized. Our results show that the presence of gas-liquid transient flow in the wellbore and the subsequent liquid CO₂ build-up in the wellbore significantly increases the bottom hole pressure. The results show that the mean permeability of the target formation layer represents the most important controlling effect on the wellbore transient functions. We used the concepts and understanding developed through the wellbore flow dynamics characterization and the sensitivity analysis to redesign injection tests to control the CO₂ wellbore transient flow. We also performed history-matching of the injection tests to examine various combinations of porosity and permeability multipliers in an attempt to match the historical pressure and temperature data obtained during the CO₂ injection tests. The outcomes of this study provide an improved understanding of the transient wellbore behavior during CO₂ injection over certain pressure-temperature ranges. Results developed here may be used to monitor the injection performance, well and reservoir responses under different injection scenarios.

我们使用完全耦合的非等温瞬态多相井筒-储层流动模型研究 CO ₂注入井筒的动力学。这项研究的重点是在加拿大艾伯塔省的 CaMI 现场研究站 (FRS) 进行的注入测试中井眼参数的瞬态行为。分析了井眼瞬态压力和温度以及随后通过井眼的CO ₂相行为，并表征了储层参数对井眼瞬态流动行为的影响。我们的结果表明，井筒中存在气液瞬态流动，随后的液态 CO ₂井筒中的堆积显着增加了井底压力。结果表明，目标地层的平均渗透率是对井筒瞬态函数最重要的控制作用。我们使用通过井眼流动动力学表征和敏感性分析得出的概念和理解来重新设计注入测试，以控制 CO ₂井眼瞬态流动。我们还进行了注入测试的历史匹配，以检查孔隙度和渗透率乘数的各种组合，以尝试匹配在 CO ₂注入测试期间获得的历史压力和温度数据。这项研究的结果提供了对 CO 过程中瞬态井眼行为的更好理解₂在特定压力-温度范围内注入。此处开发的结果可用于监测不同注入情况下的注入性能、井和储层响应。