Investigation of Polymer-Assisted CO2 Flooding to Enhance Oil Recovery in Low-Permeability Reservoirs

被引:8
作者
Chen, Xin [1 ,2 ,3 ]
Li, Yiqiang [4 ]
Sun, Xiaoguang [5 ]
Liu, Zheyu [4 ]
Liu, Jianbin [1 ,2 ,3 ]
Liu, Shun [1 ,2 ,3 ]
机构
[1] Xian Shiyou Univ, Coll Petr Engn, Xian 710065, Peoples R China
[2] Shaanxi Key Lab Adv Stimulat Technol Oil & Gas Res, Xian 710065, Peoples R China
[3] Minist Educ, Engn Res Ctr Dev & Management Low Ultralow Permeab, Xian 710065, Peoples R China
[4] China Univ Petr, Coll Petr Engn, State Key Lab Oil & Gas Resources & Explorat, Beijing 102249, Peoples R China
[5] PetroChina Coalbed Methane Co Ltd, Beijing 100028, Peoples R China
基金
中国国家自然科学基金;
关键词
polymer-assisted CO2 flooding; CO2; responsive; injectivity; resistance increasing; profile control; EOR; MATCHING RELATIONSHIP; INJECTION; SURFACTANT;
D O I
10.3390/polym15193886
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
CO2 flooding is a favorable technical means for the efficient development of low-permeability reservoirs, and it can also contribute to the realization of net-zero CO2 emissions. However, due to the unfavorable viscosity ratio and gravity overriding effect, CO2 channeling will inevitably occur, seriously affecting its storage and displacement effects. This paper conducts a systematic study on the application of polymer-assisted CO2 flooding in low-permeability reservoirs. Firstly, the polymer agent suitable for low-permeability reservoirs is optimized through the viscosity-increasing, rheological, and temperature- and salt-resistant properties of the solution. Then, the injectivity performance, resistance-increasing ability, and profile-improving effect of the polymer solution were evaluated through core experiments, and the optimum concentration was optimized. Finally, the enhanced oil recovery (EOR) effects of polymer-assisted and water-assisted CO2 flooding were compared. The results show that the temperature-resistant polymer surfactant (TRPS) has a certain viscosity-increasing performance, good temperature resistance performance, and can react with CO2 to increase the solution viscosity significantly. Meanwhile, TRPS has good injection performance and resistance-increasing effect. The resistance increasing factor (eta and eta ' ) of TRPS-assisted CO2 flooding increases with increased permeability, the concentration of TRPS solution, and injection rounds. Considering eta ' and the profile improvement effect comprehensively, the application concentration of TRPS should be 1000 mg/L. The EOR effect of TRPS-assisted CO2 flooding is 8.21% higher than that of water-assisted CO2 flooding. The main effective period is in the first and second rounds, and the best injection round is three. The research content of this paper can provide data support for the field application of polymer-assisted CO2 flooding in low-permeability reservoirs.
引用
收藏
页数:20
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