| 化子坪长6储层长岩心CO2驱替实验及数值模拟评价 |
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| 关键词:low-permeability reservoir CO2 flooding CO2 sequestration long core sample numerical simulation |
| 基金项目:国家重点研发计划“二氧化碳提高油藏采收率与地质封存一体化关键技术及应用示范”项目(编号: 2022YFE0206700);中国地质调查局地质调查项目“黄河三角洲二氧化碳地质封存地质调查评价”(编号: DD20221819);国家自然科学基金项目“典型砂岩咸水层二氧化碳地质封存性能定量评价方法研究”(编号: U2244215) |
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| Long Core Testing and Numerical Simulation Investigations of CO2-EOR and Geological Storage in the 6th Section of the Yanchang Formation in the Huaziping Oil Reservoir |
| Carbon dioxide-enhanced oil recovery (CO2-EOR) has gained increasing importance for many low-permeability and low-porosity oil reservoirs in China. In light of the national net-zero emission target, efficient CO2 storage becomes a vital consideration in the utilization of CO2-EOR techniques. Therefore, for low-permeability reservoirs, experiments involving natural core floods using long rock cores for CO2 displacement were conducted in this study. TOGA (TOUGH Oil, Gas, Aqueous) software was employed to establish a core-scale numerical model to perform model identification and validation. Sensitivity analyses were performed to assess the model's effectiveness and the impact of physical properties. The study produced some interesting results. 1) Based on the gas-oil ratio at the outlet, CO2 flooding for oil recovery can be divided into four different stages: no gas observed (0~100), a minimal amount of gas (100~1 000), gas breakthrough (1 000~10 000), and significant gas breakthrough (>10 000). 2) Porosity, permeability, and heterogeneity were identified as influential factors on simulation results. Therefore, these aspects should be prioritized in subsequent large-scale field models. The findings of this research serve as a foundation for parameterization in large-scale field models implemented at real sites. |
| KANG Yulong,WANG Xinwen,LI Chaoyue,LI Cai,GUO Chaobin,LIU Kai,YAO Zhenjie,ZHAO Yongpan.2024.Long Core Testing and Numerical Simulation Investigations of CO2-EOR and Geological Storage in the 6th Section of the Yanchang Formation in the Huaziping Oil Reservoir[J].Acta Geoscientica Sinica,45(2):243-251. |
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