Petroleum Reservoir Evaluation and Development >
2025 , Vol. 15 >Issue 4: 672 - 678
DOI: https://doi.org/10.13809/j.cnki.cn32-1825/te.2025.04.017
Effectiveness evaluation and field application of CO2-viscoelastic fluid synergistic flooding in low-permeability tight reservoirs
Received date: 2024-07-05
Online published: 2025-07-19
CO2 sweep efficiency and gas channeling are key factors restricting the effectiveness of CO2 flooding in low-permeability tight reservoirs. To address the technical issues of low sweep efficiency and gas susceptibility to channeling in CO2 flooding, a viscoelastic fluid system (CMS) was proposed to improve CO2 flooding in low-permeability tight reservoirs. A systematic study was conducted on the viscoelasticity, interfacial activity, injectivity, plugging performance, and oil displacement performance of CMS under oil reservoir conditions. The synergistic flooding performance of CO2-CMS was explored, and field trials were carried out. Experimental results demonstrated that at reservoir temperatures ranging from 30-80 ℃, CMS with a mass fraction of 0.5% showed certain viscoelasticity, with elasticity as the dominant characteristic, and both viscosity and elasticity decreased as temperature increased. At an oil reservoir temperature of 45 ℃, the viscosity of CMS was 3.27 mPa·s, and it exhibited strong elasticity. Furthermore, CMS could effectively reduce the oil-water interfacial tension to 2.68×10-2 mN/m. After core samples were immersed in the CO2-CMS system, the water-phase contact angle decreased to 8.75°, indicating enhanced hydrophilicity. The CO2-CMS system demonstrated good injectability in low-permeability tight cores, with smaller slug sizes yielding better injection performance. In long-core displacement experiments, using a 0.3 PV slug of CMS followed by CO2 flooding increased the recovery rate by up to 27.79%. In double-tube parallel core displacement experiments, alternating CMS and CO2 proved most effective, as it successfully sealed the high-permeability cores and mobilized low-permeability cores, resulting in a 26.28% increase in recovery. Field trial data from well groups indicated that after applying CMS, the overall liquid and oil production increased, and the CO2 volume fraction in gas-channeling wells significantly decreased. This research provides new technical insights and practical solutions for improving the efficiency of CO2 flooding in low-permeability tight reservoirs.
TANG Ruijia , CHEN Longlong , XIE Xuqiang , ZHAO Cong , WANG Beilei , JIANG Shaojing . Effectiveness evaluation and field application of CO2-viscoelastic fluid synergistic flooding in low-permeability tight reservoirs[J]. Petroleum Reservoir Evaluation and Development, 2025 , 15(4) : 672 -678 . DOI: 10.13809/j.cnki.cn32-1825/te.2025.04.017
| [1] | 袁士义, 王强, 李军诗, 等. 注气提高采收率技术进展及前景展望[J]. 石油学报, 2020, 41(12): 1623-1632. |
| YUAN Shiyi, WANG Qiang, LI Junshi, et al. Technology progress and prospects of enhanced oil recovery by gas injection[J]. Acta Petrolei Sinica, 2020, 41(12): 1623-1632. | |
| [2] | 黄兴, 倪军, 李响, 等. 致密油藏不同微观孔隙结构储层CO2驱动用特征及影响因素[J]. 石油学报, 2020, 41(7): 853-864. |
| HUANG Xing, NI Jun, LI Xiang, et al. Characteristics and influencing factors of CO2 flooding in different microscopic pore structures in tight reservoirs[J]. Acta Petrolei Sinica, 2020, 41(7): 853-864. | |
| [3] | 王香增, 杨红, 王伟, 等. 低渗透致密油藏CO2驱油与封存技术及实践[J]. 油气地质与采收率, 2023, 30(2): 27-35. |
| WANG Xiangzeng, YANG Hong, WANG Wei, et al. Technology and practice of CO2 flooding and storage in low-permeability tight reservoirs[J]. Petroleum Geology and Recovery Efficiency, 2023, 30(2): 27-35. | |
| [4] | 王维波, 余华贵, 杨红, 等. 低渗透裂缝性油藏CO2驱两级封窜驱油效果研究[J]. 油田化学, 2017, 34(1): 69-73. |
| WANG Weibo, YU Huagui, YANG Hong, et al. Effect of two-stage sealing gas channeling and flooding in low permeability fracture reservoirs during CO2 flooding[J]. Oilfield Chemistry, 2017, 34(1): 69-73. | |
| [5] | 汤瑞佳, 陈龙龙, 江绍静, 等. 低渗透油藏强化CO2/水交替注入驱油效果实验研究[J]. 非常规油气, 2024, 11(4): 70-78. |
| TANG Ruijia, CHEN Longlong, JIANG Shaojing, et al. Experimental study on the effect of enhanced CO2/water alternate flooding in low permeability reservoir[J]. Unconventional Oil & Gas, 2024, 11(4): 70-78. | |
| [6] | 张利军, 谭先红, 焦钰嘉, 等. 海上低渗油藏CO2微泡沫驱提高采收率实验与数值模拟研究[J]. 中国海上油气, 2023, 35(5): 145-153. |
| ZHANG Lijun, TAN Xianhong, JIAO Yujia, et al. Experimental study and numerical simulation on enhanced oil recovery by CO2 microfoam flooding in offshore low-permeability reservoirs[J]. China Offshore Oil and Gas, 2023, 35(5): 145-153. | |
| [7] | 鲍云波. CO2气窜主控因素研究[J]. 科学技术与工程, 2013, 13(9): 2348-2351. |
| BAO Yunbo. The research on main controlling factors of CO2 gas channeling[J]. Science Technology and Engineering, 2013, 13(9): 2348-2351. | |
| [8] | 李宛珊, 王健, 任振宇, 等. 低渗透油藏二氧化碳气溶性泡沫控制气窜实验研究[J]. 特种油气藏, 2019, 26(5): 136-141. |
| LI Wanshan, WANG Jian, REN Zhenyu, et al. Gas-channeling control experiment with carbon dioxide gas-soluble foam in low-permeability oil reservoir[J]. Special Oil & Gas Reservoirs, 2019, 26(5): 136-141. | |
| [9] | 董江艳, 吴淑红, 邢国强. 低渗低黏油藏CO2气水交替注入主控因素分析[J]. 西安石油大学学报(自然科学版), 2019, 34(4): 43-51. |
| DONG Jiangyan, WU Shuhong, XING Guoqiang. Main controlling factors of CO2 gas-water alternating injection in low permeability and low viscosity oil reservoirs[J]. Journal of Xi’an Shiyou University (Natural Science Edition), 2019, 34(4): 43-51. | |
| [10] | 贾凯锋, 计董超, 高金栋, 等. 低渗透油藏CO2驱油提高原油采收率研究现状[J]. 非常规油气, 2019, 6(1): 107-114. |
| JIA Kaifeng, JI Dongchao, GAO Jindong, et al. The exisiting state of enhanced oil recovery by CO2 flooding in low permeability reservoirs[J]. Unconventional Oil & Gas, 2019, 6(1): 107-114 | |
| [11] | 汤瑞佳, 王贺谊, 余华贵, 等. 水气交替注入对CO2驱油效果的影响[J]. 断块油气田, 2016, 23(3): 358-362. |
| TANG Ruijia, WANG Heyi, YU Huagui, et al. Effect of water and gas alternate injection on CO2 flooding[J]. Fault-Block Oil & Gas Field, 2016, 23(3): 358-362. | |
| [12] | LI D X, ZHANG L, LIU Y M, et al. CO2-triggered gelation for mobility control and channeling blocking during CO2 flooding processes[J]. Petroleum Science, 2016, 13(2): 247-258. |
| [13] | 江绍静, 王维波, 黄春霞, 等. 改性淀粉凝胶体系控制二氧化碳窜逸技术研究[J]. 特种油气藏, 2016, 23(4): 136-139. |
| JIANG Shaojing, WANG Weibo, HUANG Chunxia, et al. Application of modified starch gel system to prevent CO2 breakthrough[J]. Special Oil & Gas Reservoirs, 2016, 23(4): 136-139 | |
| [14] | 赵梓平. 驱油用两性离子型双子表面活性剂的合成及应用[J]. 断块油气田, 2019, 26(1): 119-122. |
| ZHAO Ziping. Synthesis and application of zwitterionic gemini surfactant flooding agent[J]. Fault-Block Oil & Gas Field, 2019, 26(1): 119-122. | |
| [15] | 石端胜,王宏申,华科良,等. 渤海某油田驱油用超低界面张力表面活性剂研究[J]. 石油与天然气化工,2023,52(4): 83-88. |
| SHI Duansheng, WANG Hongshen, HUA Keliang, et al. Research of ultra-low interfacial tension surfactant for oil displacement in an oilfield of Bohai[J]. Chemical Engineering of Oil & Gas, 2023,52(4): 83-88. | |
| [16] | 田茂章, 宋新民, 马德胜, 等. 低渗透黏弹性表面活性剂的研制和评价[J]. 应用化工, 2015, 44(5): 804-809. |
| TIAN Maozhang, SONG Xinmin, MA Desheng, et al. Investigation on viscoelastic surfactant system in low permeability reservoir[J]. Applied Chemical Industry, 2015, 44(5): 804-809. | |
| [17] | DA C, ELHAG A, JIAN G Q, et al. CO2/water foams stabilized with cationic or zwitterionic surfactants at temperatures up to 120 ℃ in high salinity brine[C]// Paper SPE-191479-MS presented at the SPE Annual Technical Conference and Exhibition, September 24-26, 2018. |
| [18] | 王典林, 杨琼, 魏兵, 等. 甜菜碱型表面活性剂结构对CO2泡沫液膜性质的影响[J]. 油气藏评价与开发, 2023, 13(3): 313-321. |
| WANG Dianlin, YANG Qiong, WEI Bing, et al. Effect of betaine surfactant structure on the properties of CO2 foam film[J]. Petroleum Reservoir Evaluation and Development, 2023, 13(3): 313-321. | |
| [19] | 唐建东, 王智林, 葛政俊. 苏北盆地江苏油田CO2驱油技术进展及应用[J]. 油气藏评价与开发, 2024, 14(1): 18-25. |
| TANG Jiandong, WANG Zhilin, GE Zhengjun. CO2 flooding technology and its application in Jiangsu Oilfield in Subei Basin[J]. Petroleum Reservoir Evaluation and Development, 2024, 14(1): 18-25. | |
| [20] | 董沅武, 王睿, 王思瑶, 等. 特低渗砂岩油藏CO2-低界面张力黏弹流体协同驱油机理研究[J]. 石油与天然气化工, 2022, 51(6): 77-83. |
| DONG Yuanwu, WANG Rui, WANG Siyao, et al. Study on synergistic oil displacement mechanism of CO2-low interfacial tension viscoelastic fluid alternating flooding in ultra-low permeability sandstone reservoir[J]. Chemical Engineering of Oil & Gas, 2022, 51(6): 77-83. | |
| [21] | LI K X, JING X Q, HE S, et al. Laboratory study displacement efficiency of viscoelastic surfactant solution in enhanced oil recovery[J]. Energy & Fuels, 2016, 30(6): 4467-4474. |
| [22] | 范成成. 阴离子表面活性剂与无机盐相互作用的理论研究[D]. 东营: 中国石油大学(华东), 2014. |
| FAN Chengcheng. Theoretical studies on the interaction between anionic surfactants and inorganic salts[D]. Dongying: China University of Petroleum (Huadong), 2014. | |
| [23] | 冯树云, 唐善法, 胡睿智, 等. 无机盐对阴离子Gemini表面活性剂溶液流变性的影响及机理[J]. 油田化学, 2021, 38(2): 310-316. |
| FENG Shuyun, TANG Shanfa, HU Ruizhi, et al. Effect of inorganic salts on rheological properties of anionic gemini surfactant solution and its mechanism[J]. Oilfield Chemistry, 2021, 38(2): 310-316. | |
| [24] | 陈龙龙. 致密砂岩油藏CO2-黏弹性流体协同驱油机理研究[D]. 北京: 中国石油大学(北京), 2022. |
| CHEN Longlong. Study of CO2-viscoelastic fluid synergistic oil drive mechanism in tight sandstone reservoirs[D]. Beijing: China University of Petroleum (Beijing), 2022. |
/
| 〈 |
|
〉 |