使用 N2 辅助 CO2 驱油提高致密油采收率的新方法及其 CO2 封存潜力,Energy & Fuels

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使用 N2 辅助 CO2 驱油提高致密油采收率的新方法及其 CO2 封存潜力
Energy & Fuels ( IF 5.2 ) Pub Date : 2023-05-13 , DOI: 10.1021/acs.energyfuels.3c00312
Yongchao Wang ₁ , Liehui Zhang ₁ , Yulong Zhao ₁ , Xiang Zhou ₁ , Shijian Lu _{2,

3} , Deping Zhang ₄ , Jianhua Qin ₅ , Zhengdong Lei ₆ , Ye Tian ₁

Affiliation

在 28.42 cm 长的岩心塞中进行了4 种类型的注气实验──CO ₂驱、N ₂驱、CO ₂和 N ₂交替驱以及 CO ₂预段塞 N ₂驱，以研究 CO 的生产动态。₂和N ₂驱模型在提高致密油驱效率方面的作用。实验结果表明如下。(1) CO ₂和N ₂驱致密油驱效率最高时注气量为0.10 mL/min，CO ₂驱效率为68.75%，气突破时间为0.33 PV，CO _2个利用率为11.35 Mscf/stb，N ₂驱油效率为38.46%，气体突破时间为0.42 PV。(2)CO ₂与N ₂交替驱致密油最高驱油效率为56%，CO ₂利用率为7.97 Mscf/stb。_{(3)CO 2}预段塞N ₂驱致密油驱效率最高为53.08% 。实验结果的比较表明，较大的CO ₂段塞导致较高的驱油效率。CO ₂塞子大小对突破前的采收率影响较小。_{突破后的CO 2}堵塞越大，采收率越高。优化后的 N₂注入时间是CO ₂突破时间(0.33 PV)。在优化情况下，驱油效率和贡献表明最佳 CO ₂段塞尺寸为 0.50 PV。当以0.50 PV注入纯CO ₂并将气体切换为N ₂时，回收率为5.82％，贡献率为9.20％。当以0.50 PV注入纯CO ₂，随后连续注入纯CO ₂时，回收率为8.59%，贡献率为12.49%。两种方法采收率相差不大，因此N _{2最佳注入时机为CO}₂突破后0.17 PV ，驱油效率为63.27%。

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Novel Approach to Enhancing Tight Oil Recovery Using N2-Assisted CO2 Flooding and Its Potential for CO2 Storage

Four types of gas injection experiments─CO₂ flooding, N₂ flooding, alternating CO₂ and N₂ flooding, and CO₂ pre-slug N₂ flooding─were conducted in a 28.42 cm long core plug to study the production performances of a CO₂ and N₂ flooding model in enhancing the tight oil flooding efficiency. Experimental results indicate that the following. (1) For CO₂ and N₂ flooding, the highest tight oil flooding efficiency is achieved at a gas injection rate of 0.10 mL/min, with a CO₂ flooding efficiency of 68.75%, a gas breakthrough time of 0.33 PV, a CO₂ utilization of 11.35 Mscf/stb, an N₂ flooding efficiency of 38.46%, and a gas breakthrough time of 0.42 PV. (2) For alternating CO₂ and N₂ flooding, the highest tight oil flooding efficiency is 56%, and the CO₂ utilization is 7.97 Mscf/stb. (3) The highest tight oil flooding efficiency is 53.08% for CO₂ pre-slug N₂ flooding. A comparison of the experimental results indicates that a larger CO₂ slug leads to a higher oil flooding efficiency. The CO₂ plug size has less influence on the recovery rate before breakthrough. The larger the CO₂ plug after breakthrough, the higher the recovery rate. The optimized N₂ injection time is the CO₂ breakthrough time (0.33 PV). In the optimized case, flooding efficiency and contribution indicate the optimal CO₂ slug size at 0.50 PV. When pure CO₂ is injected at 0.50 PV and the gas is switched to N₂, the recovery is 5.82%, and the contribution is 9.20%. When pure CO₂ is injected at 0.50 PV, followed by the continuous injection of pure CO₂, the recovery rate is 8.59% and the contribution rate is 12.49%. The difference between the recovery rates of the two methods is small, so the best injection timing for N₂ is 0.17 PV after CO₂ breakthrough, and the oil flooding efficiency is 63.27%.

更新日期：2023-05-13

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