Multiwell CO2 injectivity: impact of boundary conditions and brine extraction on geologic CO2 storage efficiency and pressure buildup.
Multiwell CO2 injectivity: impact of boundary conditions and brine extraction on geologic CO2 storage efficiency and pressure buildup.
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DOI：
10.1021/es4017014
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发表时间：
2014-01
影响因子：
11.4
通讯作者：
J. Heath;S. McKenna;T. Dewers;J. Roach;P. Kobos
中科院分区：
文献类型：
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作者：
J. Heath;S. McKenna;T. Dewers;J. Roach;P. Kobos
CO2储存效率是表示地下地质构造的孔隙空间的可用于储存CO2的部分的度量。对大规模地质CO2封存效率的估计取决于各种因素，包括地质特性和操作设计。这些因素决定了对CO2储存资源、储存地点的寿命和储存库中潜在压力的估计。本研究采用数值模拟来量化CO2注入井数量，井间距和存储效率作为地质地层特性，开放与封闭的边界条件，以及注入或不注入盐水提取的函数。这组建模运行很重要，因为它允许比较CO2储存效率的控制因素。封闭域中的盐水提取可以导致与开放边界域中的注入类似的存储效率。与分别注入和提取相同体积的CO2和盐水的理想情况相比，注入和提取威尔斯井处的井下压力的地质力学约束降低了CO2存储效率。应考虑到地质力学限制，以避免对储存场地造成潜在损害。
CO2 storage efficiency is a metric that expresses the portion of the pore space of a subsurface geologic formation that is available to store CO2. Estimates of storage efficiency for large-scale geologic CO2 storage depend on a variety of factors including geologic properties and operational design. These factors govern estimates on CO2 storage resources, the longevity of storage sites, and potential pressure buildup in storage reservoirs. This study employs numerical modeling to quantify CO2 injection well numbers, well spacing, and storage efficiency as a function of geologic formation properties, open-versus-closed boundary conditions, and injection with or without brine extraction. The set of modeling runs is important as it allows the comparison of controlling factors on CO2 storage efficiency. Brine extraction in closed domains can result in storage efficiencies that are similar to those of injection in open-boundary domains. Geomechanical constraints on downhole pressure at both injection and extraction wells lower CO2 storage efficiency as compared to the idealized scenario in which the same volumes of CO2 and brine are injected and extracted, respectively. Geomechanical constraints should be taken into account to avoid potential damage to the storage site.