Transient CO2 leakage and injection in wellbore‐reservoir systems for geologic carbon sequestration
Transient CO2 leakage and injection in wellbore‐reservoir systems for geologic carbon sequestration
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DOI：
10.1002/ghg.41
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发表时间：
2011-12
影响因子：
2.2
通讯作者：
L. Pan;C. Oldenburg;K. Pruess;Yushu Wu
中科院分区：
文献类型：
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作者：
L. Pan;C. Oldenburg;K. Pruess;Yushu Wu
在最基本的层面上，将二氧化碳注入深部储层进行地质碳封存（GCS）涉及一个由井筒和目标储层组成的系统，井筒是唯一可用的放置二氧化碳的管道。一般来说，井眼也被认为是最可能从GCS站点泄漏co2和盐水的管道，特别是那些具有历史油气生产的沉积盆地。我们开发了一个耦合的井筒和油藏模型，用于模拟CO 2注入和井筒泄漏的动态，并将该模型应用于涉及向上流动（例如泄漏）和向下流动（注入）的地质CO 2储存情况。新的模拟器通过将井筒和油藏分配到两个不同的子域，从而集成了井筒-油藏系统，其中的流动由适当的物理定律控制。在油藏中，我们使用标准的多相达西流方法来模拟流动。在井筒中，我们使用漂移通量模型和相关的守恒方程来描述二氧化碳-水混合物的瞬态两相非等温井筒流动。对泄漏测试问题的应用表明，如果储层能够在井筒中保持恒定的条件，则瞬态流动在一天内就会发展成准稳态。否则，泄漏动力学可能比简单的准稳态流动复杂得多，特别是当从储层流入的其中一个相接近其残余饱和度时。一个注入枯竭（低压）气藏的测试问题显示，数百天内的瞬态行为，井中的亚临界状态在240天后消失。©2011化学工业协会和约翰威利父子有限公司
At its most basic level, the injection of CO 2 into deep reservoirs for geologic carbon sequestration (GCS) involves a system comprising the wellbore and the target reservoir, the wellbore being the only conduit available to emplace the CO 2 . Wellbores in general have also been identified as the most likely conduit for CO 2 and brine leakage from GCS sites, especially those in sedimentary basins with historical hydrocarbon production. We have developed a coupled wellbore and reservoir model for simulating the dynamics of CO 2 injection and leakage through wellbores, and we have applied the model to situations relevant to geologic CO 2 storage involving upward flow (e.g. leakage) and downward flow (injection). The new simulator integrates a wellbore‐reservoir system by assigning the wellbore and reservoir to two different sub‐domains in which flow is controlled by appropriate laws of physics. In the reservoir, we model flow using a standard multiphase Darcy flow approach. In the wellbores, we use the drift‐flux model and related conservation equations for describing transient two‐phase non‐isothermal wellbore flow of CO 2 ‐water mixtures. Applications to leakage test problems reveal transient flows that develop into quasi‐steady states within a day if the reservoir can maintain constant conditions at the wellbore. Otherwise, the leakage dynamics could be much more complicated than the simple quasi‐steady‐state flow, especially when one of the phases flowing in from the reservoir is near its residual saturation. A test problem of injection into a depleted (low‐pressure) gas reservoir shows transient behavior out to several hundred days with sub‐critical conditions in the well disappearing after 240 days. © 2011 Society of Chemical Industry and John Wiley & Sons, Ltd