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Experimental and numerical investigation of wormholing during CO2 storage and water alternating gas injection
International Journal of Greenhouse Gas Control ( IF 3.9 ) Pub Date : 2019-12-07 , DOI: 10.1016/j.ijggc.2019.102901
Jeroen Snippe , Steffen Berg , Keschma Ganga , Niels Brussee , Rick Gdanski

Carbon dioxide (CO2) injection into geological formations is gaining global interest. Examples include CO2 storage to mitigate greenhouse gas emissions and water alternating gas (WAG) injection for enhanced oil recovery (EOR) and storage. Injected CO2 inevitably dissolves in water (injected or formation), which results in acidic conditions that can dissolve the rock matrix in carbonate reservoirs. Depending on the dissolution’s location and pattern in the reservoir, this may benefit well injectivity and/or threaten well integrity. Fine-gridded models with detailed physics and chemistry capture the relevant effects but are not suitable for the application to the field scale where instead correlations are used. The correlations that exist, however, are so far not sufficiently constrained to be of practical use. We report new experimental and modelling work that provides the means for qualitative to quantitative field-scale predictions of these effects for all the different combinations of CO2–water injection of interest. These show that, for conventional injection strategies (dry CO2 injection and WAG), there are no material concerns, but there are potential well integrity issues that need more detailed investigation for the proposed alternative strategies of carbonated water injection or co-injection.



中文翻译:

CO 2储存和水交替注气过程中蜗杆蜗杆的实验和数值研究

向地质构造中注入二氧化碳(CO 2)引起了全球关注。示例包括可减少温室气体排放的CO 2储存和用于增强采油量(EOR)和储存的水交替气(WAG)注入。注入的CO 2不可避免地会溶于水(注入或形成),这会导致酸性条件,从而溶解碳酸盐岩储层中的岩石基质。取决于溶出度的位置和储层中的模式,这可能有利于注入井和/或威胁井的完整性。具有详细的物理和化学特性的精细网格模型可以捕获相关的效果,但不适合应用于使用相关性的现场规模。然而,到目前为止,存在的相关性还没有得到足够的约束以无法实际使用。我们报告了新的实验和建模工作,这些工作为所有不同的CO 2组合对这些影响进行了定性到定量的田间规模预测–感兴趣的注水。这些表明,对于常规注入策略(干式CO 2注入和WAG),没有实质性问题,但是存在潜在的井完整性问题,需要对拟议的碳酸水注入或共注入替代策略进行更详细的研究。

更新日期:2019-12-07
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