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{"title":"The effect of H2S content on acid gas migration and storage in shale reservoir by numerical simulation","authors":"Xiaoyan Zhang, Ning Liu, Qi Li, Pingzhi Chen, Xiaochen Wei","doi":"10.1002/ghg.2232","DOIUrl":null,"url":null,"abstract":"<p>Acid gas injection is one of the most effective strategies to deal with waste gas generated during the development of sour oil and gas reservoirs. This study numerically investigates the effect of H<sub>2</sub>S content on the acid gas migration and storage in shale reservoirs. The results indicate that the variations of acid gas density, viscosity, solubility, relative permeability, and capillary pressure caused by different H<sub>2</sub>S contents have great influence on the acid gas plume migration. When acid gas is in gas state, the maximum horizontal flow appears at the lower part of the reservoir after 5 years, and the horizontal migration distance first decreases and then remains unchanged with the increase of H<sub>2</sub>S content. Hereafter, the maximum horizontal migration distance appears at the top of the reservoir, and the horizontal migration distance first increases and then remains unchanged with the increase of H<sub>2</sub>S content. When acid gas is in liquid state, the maximum horizontal migration distance appears at the lower part of the reservoir in the early stage of injection. The horizontal migration distance decreases with the increase of H<sub>2</sub>S content. Subsequently, the maximum horizontal migration distance first decreases and then increases. The vertical migration distance increases gradually with the increase of H<sub>2</sub>S content until the acid gas reaches the top of the reservoir, and then the vertical migration distance remains unchanged. © 2023 Society of Chemical Industry and John Wiley & Sons, Ltd.</p>","PeriodicalId":12796,"journal":{"name":"Greenhouse Gases: Science and Technology","volume":"13 5","pages":"634-658"},"PeriodicalIF":2.7000,"publicationDate":"2023-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Greenhouse Gases: Science and Technology","FirstCategoryId":"93","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1002/ghg.2232","RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENERGY & FUELS","Score":null,"Total":0}
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Abstract
Acid gas injection is one of the most effective strategies to deal with waste gas generated during the development of sour oil and gas reservoirs. This study numerically investigates the effect of H2 S content on the acid gas migration and storage in shale reservoirs. The results indicate that the variations of acid gas density, viscosity, solubility, relative permeability, and capillary pressure caused by different H2 S contents have great influence on the acid gas plume migration. When acid gas is in gas state, the maximum horizontal flow appears at the lower part of the reservoir after 5 years, and the horizontal migration distance first decreases and then remains unchanged with the increase of H2 S content. Hereafter, the maximum horizontal migration distance appears at the top of the reservoir, and the horizontal migration distance first increases and then remains unchanged with the increase of H2 S content. When acid gas is in liquid state, the maximum horizontal migration distance appears at the lower part of the reservoir in the early stage of injection. The horizontal migration distance decreases with the increase of H2 S content. Subsequently, the maximum horizontal migration distance first decreases and then increases. The vertical migration distance increases gradually with the increase of H2 S content until the acid gas reaches the top of the reservoir, and then the vertical migration distance remains unchanged. © 2023 Society of Chemical Industry and John Wiley & Sons, Ltd.
数值模拟研究H2S含量对页岩油气藏酸性气运移和储集的影响
注酸气是处理含酸油气藏开发过程中产生的废气最有效的策略之一。通过数值模拟研究了H2S含量对页岩储层酸性气运移和储集的影响。结果表明,不同H2S含量引起的酸性气体密度、粘度、溶解度、相对渗透率和毛管压力的变化对酸性气体羽流运移有较大影响。酸性气处于气态时,5年后在储层下部出现最大水平流动,水平运移距离随H2S含量的增加先减小后保持不变。此后,最大水平运移距离出现在储层顶部,随着H2S含量的增加,水平运移距离先增大后保持不变。当酸性气体为液态时,注入初期最大水平运移距离出现在储层下部。随着H2S含量的增加,水平迁移距离减小。随后,最大水平偏移距离先减小后增大。垂直运移距离随着H2S含量的增加逐渐增大,直到酸性气体到达储层顶部,然后垂直运移距离保持不变。©2023化学工业协会和John Wiley &儿子,有限公司
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