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{"title":"Experimental study on the flow characteristics of supercritical CO2 in reservoir sandstones from the Ordos Basin, China","authors":"Qianlin Zhu, Dongbao Chen, Shijian Lu, Shaojin Jiang","doi":"10.1002/ghg.2246","DOIUrl":null,"url":null,"abstract":"<p>Understanding the flow characteristics of supercritical CO<sub>2</sub> in dry sandstones or those with low water content provides crucial information on the flow behavior in near-wellbore zone. We conducted supercritical CO<sub>2</sub> core flooding experiments using sandstone cores extracted from potential CO<sub>2</sub> reservoirs in the Ordos Basin, China. During the experiments, we reduced the water content of saturated cores by flushing with dry CO<sub>2</sub> and subsequently vacuumizing them at a temperature of 35°C to simulate sandstones with low water content. The experimental results demonstrate that the CO<sub>2</sub> permeability was initially high during the low differential pressure stage and remained constant as the differential pressure increased. In the carbonic acid solution injection experiment, we observed an increase in the flow rate of the solution with the continuous interaction in the cores from the Shanxi and Shihezi groups, while the Yanchang group exhibited the opposite effect. This increase in permeability can be attributed to mineral dissolution and the loss of fine particles. Conversely, the blockage of fine particles or the precipitation of dissolved minerals may lead to a decrease in permeability. After the CO<sub>2</sub>–water–rock interaction, the CO<sub>2</sub> permeability decreased compared to before the interaction, indicating that adsorbed water, the precipitation of dissolved mineral, or pore throat blockage by fine particles could induce this permeability decrease. The impact of adsorbed water on the decrease in CO<sub>2</sub> permeability is significant. Additionally, the CO<sub>2</sub>–water–rock interaction caused corrosion on the anorthite surface. Furthermore, calcite dispersed in connected pores displayed a more pronounced dissolution compared to cemented calcite. © 2023 Society of Chemical Industry and John Wiley & Sons, Ltd.</p>","PeriodicalId":12796,"journal":{"name":"Greenhouse Gases: Science and Technology","volume":null,"pages":null},"PeriodicalIF":2.7000,"publicationDate":"2023-11-29","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.2246","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
Understanding the flow characteristics of supercritical CO2 in dry sandstones or those with low water content provides crucial information on the flow behavior in near-wellbore zone. We conducted supercritical CO2 core flooding experiments using sandstone cores extracted from potential CO2 reservoirs in the Ordos Basin, China. During the experiments, we reduced the water content of saturated cores by flushing with dry CO2 and subsequently vacuumizing them at a temperature of 35°C to simulate sandstones with low water content. The experimental results demonstrate that the CO2 permeability was initially high during the low differential pressure stage and remained constant as the differential pressure increased. In the carbonic acid solution injection experiment, we observed an increase in the flow rate of the solution with the continuous interaction in the cores from the Shanxi and Shihezi groups, while the Yanchang group exhibited the opposite effect. This increase in permeability can be attributed to mineral dissolution and the loss of fine particles. Conversely, the blockage of fine particles or the precipitation of dissolved minerals may lead to a decrease in permeability. After the CO2 –water–rock interaction, the CO2 permeability decreased compared to before the interaction, indicating that adsorbed water, the precipitation of dissolved mineral, or pore throat blockage by fine particles could induce this permeability decrease. The impact of adsorbed water on the decrease in CO2 permeability is significant. Additionally, the CO2 –water–rock interaction caused corrosion on the anorthite surface. Furthermore, calcite dispersed in connected pores displayed a more pronounced dissolution compared to cemented calcite. © 2023 Society of Chemical Industry and John Wiley & Sons, Ltd.
鄂尔多斯盆地储层砂岩超临界CO2流动特征实验研究
了解超临界CO2在干砂岩或低含水率砂岩中的流动特征,为研究近井带的流动特性提供了重要信息。利用鄂尔多斯盆地潜在CO2储层砂岩岩心进行了超临界CO2岩心驱替实验。在实验中,我们通过用干燥的CO2冲洗饱和岩心,然后在35℃的温度下抽真空,来降低岩心的含水量,模拟低含水量的砂岩。实验结果表明,低压差阶段CO2渗透率较高,随着压差的增大,渗透率保持不变。在碳酸溶液注入实验中,我们观察到随着碳酸溶液在山西组和石河子组岩心中的持续相互作用,碳酸溶液的流速增加,而延长组岩心则相反。渗透性的增加可归因于矿物溶解和细颗粒的损失。相反,细颗粒的堵塞或溶解矿物的沉淀可能导致渗透率降低。CO2 -水-岩相互作用后,CO2渗透率较相互作用前降低,说明吸附水、溶解矿物沉淀或细颗粒堵塞孔喉可能导致渗透率降低。吸附水对CO2渗透率降低的影响是显著的。此外,co2 -水-岩相互作用导致钙长石表面腐蚀。此外,与胶结方解石相比,分散在连通孔隙中的方解石表现出更明显的溶解。©2023化学工业协会和John Wiley &儿子,有限公司
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