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Semianalytical solution for CO2 leakage through an abandoned well

机译：通过废弃井泄漏CO2的半解析解决方案

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Capture,and subsequent injection of carbon dioxide into deep geological formations is being considered as a means to reduce anthropogenic emissions of CO2 to the atmosphere. If such a strategy is to be successful, the injected CO2 must remain within the injection formation for long period's of time, at least several hundred years. Because mature continental sedimentary basins have a century-long history of oil and gas exploration and production, they are characterized by large numbers of existing oil and gas wells. For example, more than I million such wells have been drilled in the state of Texas in the United States. These existing wells represent potential leakage pathways for injected CO2. To analyze leakage potential, modeling tools are needed that predict leakage rates and patterns in systems with injection and potentially leaky wells. A new sernianalytical solution framework allows simple and efficient prediction of leakage rates for the case of injection of supercritical CO2 into a brine-saturated deep aquifer. The solution predicts the extent of the injected CO2 plume, provides leakage rates through an abandoned well located at an arbitrary distance from the injection well, and estimates the CO2 plume extent in the overlying aquifer into which the fluid leaks. Comparison to results from a numerical multiphase flow simulator show excellent agreement. Example calculations show the importance of outer boundary conditions, the influence of both density and viscosity contrasts in the resulting solutions, and the potential importance of local upconing around the leaky well. While several important limiting assumptions are required, the new sernianalytical solution provides a simple and efficient procedure for estimation Of CO2 leakage for problems involving one injection well, one leaky well, and multiple aquifers separated by impermeable aquitards.
机译：捕集二氧化碳并随后将其注入到深层地质构造中被认为是减少人为排放到大气中的二氧化碳的一种手段。如果要成功实施此策略，则注入的二氧化碳必须长时间（至少数百年）保留在注入层中。由于成熟的陆相沉积盆地具有百年的油气勘探和生产历史，因此其特征是拥有大量现有的油气井。例如，在美国德克萨斯州已钻了超过一百万口这样的井。这些现有的井代表了注入的二氧化碳的潜在泄漏途径。为了分析潜在的泄漏，需要使用建模工具来预测具有注入井和潜在泄漏井的系统中的泄漏率和模式。对于将超临界CO2注入盐水饱和的深层含水层的情况，新的年代解析解决方案框架允许简单而有效地预测泄漏率。该解决方案可预测注入的CO2羽流的程度，通过位于距注入井任意距离的废弃井提供泄漏率，并估算流体泄漏到的上覆含水层中的CO2羽流范围。与数值多相流模拟器的结果进行比较显示出极好的一致性。实例计算显示了外边界条件的重要性，密度和粘度对比在最终溶液中的影响以及泄漏井周围局部上冲的潜在重要性。尽管需要几个重要的限制假设，但新的系统分析解决方案提供了一种简单有效的方法来估算涉及一口注水井，一口漏水井和由不透水的透明水层分隔的多个含水层的问题的CO2泄漏。

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