Thermal modeling of CO2 in the injection well and reservoir at the Ordos CCS demonstration project, China
Thermal modeling of CO2 in the injection well and reservoir at the Ordos CCS demonstration project, China
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DOI：
10.1016/j.ijggc.2014.01.011
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发表时间：
2014-04
影响因子：
3.9
通讯作者：
P. Jiang;Xiaolu Li;R. Xu;Yongsheng Wang;Maoshan Chen;He-Chun Wang;Binglu Ruan
中科院分区：
文献类型：
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作者：
P. Jiang;Xiaolu Li;R. Xu;Yongsheng Wang;Maoshan Chen;He-Chun Wang;Binglu Ruan
二氧化碳捕集与封存技术是一项能够大规模实现化石燃料低碳利用的新技术。中国神华集团在中国鄂尔多斯建设了一个10万吨/年的综合CCS示范项目。本文以鄂尔多斯盆地为研究对象，建立了注CO2井-储层耦合的全场模型，模拟了CO2通过井筒和储层注入过程中的行为，考虑了与岩石的热交换和环空中水的自然对流。获得了CO2在井筒和储层中的温度和压力分布及其随时间的变化信息。CO2在井筒中的温度和压力分布的模拟结果与测井资料的一致性在8.5%以内。从定性和定量两个方面分析了导致CO2从井口到井底温度升高的三个因素：岩石吸热、压缩性和势能损失。将全场模型和用热流代替岩石的简化模型的井底温度进行了比较。最后，模拟了井筒瞬态关井效应，预测了井口潜在压降和冷却。
Carbon dioxide capture and storage is a new technology that can realize low-carbon utilization of fossil fuels in a large scale. The China Shenhua Group has built a 100,000 tons/year integrated CCS demonstration project in Ordos, China. This paper chose Ordos basin as the simulation site and developed a full-field model of a coupled injection well and reservoir to simulate the CO2behavior during CO2injection through the wellbore and reservoir, taking into account thermal exchanges with rocks and natural convection of water in the annulus. Information for CO2temperature and pressure distributions in the wellbore and the reservoir, and their variation with time, were obtained. The simulation results for the temperature and pressure profiles of CO2in the wellbore were consistent with the well data log within 8.5%. The three factors leading to CO2temperature increase from the wellhead to bottomhole, heat extraction from rocks, compressibility and potential energy loss were analyzed both qualitatively and quantitatively. Comparison between the bottomhole temperature in our full-field model and the simplified model with a heat flux to substitute for the rock was conducted. Finally, the wellbore transient shut-in effect was simulated to predict the potential pressure drop and cooling at the wellhead.