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关井阶段CO_(2)作储气库垫层气的动态影响规律
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作者 曹洪源 柏明星 +2 位作者 杜思宇 张志超 刘业新 《石油与天然气化工》 CAS CSCD 北大核心 2024年第3期37-42,共6页
目的为应对地下储气库中的垫层气损失,采用经济气体CO_(2)作为垫层气,目前,CO_(2)作垫层气在实际应用中存在各种条件限制,且对其在关井阶段的应用研究较少,有必要对在关井阶段CO_(2)作垫层气对天然气储气库的运行影响因素进行研究。方... 目的为应对地下储气库中的垫层气损失,采用经济气体CO_(2)作为垫层气,目前,CO_(2)作垫层气在实际应用中存在各种条件限制,且对其在关井阶段的应用研究较少,有必要对在关井阶段CO_(2)作垫层气对天然气储气库的运行影响因素进行研究。方法利用有限元模拟CO_(2)作储气库垫层气时,研究关井阶段储气库动态参数(注气压力、注气速率和CO_(2)垫层气比例)对混气带的影响规律。结果注气压力对混气带的影响不大,将其控制在12 MPa左右最为合理,此时混气带占储气面积的比例为23.7315%;混气带面积占比随注气速率的增大而减小,但是在注气口附近会出现混合区域,导致回采天然气时出现大量的混合气体,所以注气速率控制在0.7×10^(8) m^(3)/d时最为合理,这时混气带面积占比为18.3246%;CO_(2)作垫层气的比例对天然气-CO_(2)之间的混合影响明显,当CO_(2)垫层气比例为20%时,混气带面积占比为7.2365%。结论根据实验结果设计针对混气带的控制措施,当注气压力控制为12 MPa时,注气速率为0.7×10^(8) m^(3)/d,当CO_(2)垫层气比例为20%时,能让储气库的运作更为经济,实验结果可为实际储气库的建设提供参考。 展开更多
关键词 地下储 co_(2) 关井阶段 压力 速率 垫层比例 带占比
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天然气地下储气库CO_(2)作垫层气研究现状 被引量:3
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作者 杜思宇 柏明星 +1 位作者 张志超 刘敬源 《应用化工》 CAS CSCD 北大核心 2023年第8期2387-2391,2396,共6页
针对天然气地下储气库垫层气的相关研究,从CO_(2)和CH_(4)的热力学性质对比以及相关混气实验,综述了CO_(2)作垫层气的可行性。从静态因素和动态因素两个方面,详细综述了CO_(2)作垫层气与工作气混合的影响因素,包括储层孔隙度、渗透率、... 针对天然气地下储气库垫层气的相关研究,从CO_(2)和CH_(4)的热力学性质对比以及相关混气实验,综述了CO_(2)作垫层气的可行性。从静态因素和动态因素两个方面,详细综述了CO_(2)作垫层气与工作气混合的影响因素,包括储层孔隙度、渗透率、温度、压力、CO_(2)垫层气比例等。论述了“CO_(2)-地层水-岩石”相互作用对储层结构和稳定性的影响。研究可为CO_(2)作天然气地下储气库垫层气的注采动态变化规律分析以及提高储气库天然气采收率提供理论借鉴。 展开更多
关键词 天然地下储 co_(2)垫层 co_(2)地质封存 -水-岩”相互
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Soil-vegetation-atmosphere interaction over a hilly forest in the southern Huaihe River Basin:Long-term field experiment and preliminary analysis of basic observations
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作者 Qiudan Dai Zhenhai Guo +1 位作者 Shufen Sun Xia Xiao 《Atmospheric and Oceanic Science Letters》 CSCD 2021年第1期33-39,共7页
To improve the understanding of the CO_(2) exchange and the cycling of energy and water between the land surface and atmosphere over a typical hilly forest in southeastern China,a long-term field experimental observat... To improve the understanding of the CO_(2) exchange and the cycling of energy and water between the land surface and atmosphere over a typical hilly forest in southeastern China,a long-term field experimental observatory was established in Huainan,Anhui Province.Here,the authors briefly describe the three parts of ongoing research activities:the environmental monitoring at the site,the meteorological observations on a high tower,and particularly the intensive measurement of soil-vegetation-atmosphere interaction on a lower tower.Specifically,the diurnal variation of basic meteorological variables on a typical clear day(13 July 2018),and their temporal variation in the first three months of the low tower’s operation(4 June to 31 August 2018),and in combination with simultaneous data from the high tower,are analyzed.Results show that the data demonstrate reasonable variabilities,and the variables exhibit significant diurnal variation,characteristics of summer values,and considerable differences in summer months.The daily and monthly average albedos above the forest canopy were both 0.13.The daily average soil CO_(2) concentration was 1726 and 4481 ppm at 2 and 10 cm,respectively.The soil CO_(2) concentration changed with soil volumetric moisture contents,but showed a weak correlation with soil temperature in summer 2018.As the observatory continues to run and data continue to be collated,further investigation of the long-term variation of monsoon characteristics should be performed in the future.The experiment is useful in ecosystem and atmosphere interaction research,as well as for the development and evaluation of climate models,in the transitional climate zone of the Huaihe River basin. 展开更多
关键词 Soil-vegetation-atmosphere interaction Diurnal variation Huaihe River basin Soil co_(2)concentration
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