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Novel Approach to Enhancing Tight Oil Recovery Using N2-Assisted CO2 Flooding and Its Potential for CO2 Storage
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
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
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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%.
中文翻译：
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
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%。
更新日期：2023-05-13
中文翻译：
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
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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