Basin-scale geologic carbon sequestration will require hundreds of injection wells, each of which has costs related to property rights and regulatory requirements that correlate with the areal size of the carbon dioxide plume. These surface-footprint-related issues motivate maximizing storage efficiency radially away from each well. Radial storage efficiency (RSE) is defined here as the ratio of the volumetrically weighted carbon dioxide free-phase saturation within a given radius away from the injection well to the available pore space within that same radius. Maximizing RSE effectively minimizes the radial extent of the CO₂ plume. Optimizing RSE around individual wells requires local flow control injection strategies that can increase the uniformity of the filling of pore space around the well over the entire length of the perforated injection interval despite differences in local formation transmissivity. The goal of uniform filling of the storage reservoir starting from the well outward is to maximize carbon dioxide sweep and trapping locally outward from the well in all of the layers of the storage region before buoyancy forces predominate and drive carbon dioxide upward where it will spread laterally under lower-permeability layers. Example simulations of carbon dioxide injection into a layered storage system with and without local flow control are presented to show the advantage of uniformly filling all layers and how RSE can be used to quantify storage efficiency for the two different injection approaches. Published 2021. This article is a U.S. Government work and is in the public domain in the USA.

中文翻译：

---

CO2 注入的径向储存效率：量化局部流量控制方法的有效性

盆地规模的地质固碳将需要数百个注入井，每个注入井的成本都与产权和监管要求相关，这些成本与二氧化碳羽流的面积大小相关。这些与地表足迹相关的问题促使远离每口井的径向最大化存储效率。径向储存效率 (RSE) 在此定义为距离注入井给定半径内的体积加权二氧化碳自由相饱和度与该相同半径内可用孔隙空间的比率。最大化 RSE 有效地最小化 CO ₂的径向范围羽。优化单个井周围的 RSE 需要局部流动控制注入策略，尽管局部地层透射率存在差异，但该策略可以在射孔注入间隔的整个长度上增加井周围孔隙空间填充的均匀性。从井向外均匀填充存储储层的目标是在浮力占主导地位并推动二氧化碳向上横向扩散之前，最大化二氧化碳的吹扫和从井中局部向外捕获存储区域的所有层在低渗透层下。介绍了将二氧化碳注入到具有和没有局部流量控制的分层存储系统的示例模拟，以显示均匀填充所有层的优势以及如何使用 RSE 来量化两种不同注入方法的存储效率。2021 年出版。本文为美国政府作品，在美国属于公有领域。