Study on the mechanism of CO2 composite system assisted steam stimulation of oil recovery efficiency in heavy oil reservoirs

被引：5
作者：
Wei, Jianguang [1 ]
Zhang, Dong [2 ]
Yang, Erlong [2 ]
Shen, Anqi [2 ]
Zhou, Runnan [2 ]
机构：
[1] Northeast Petr Univ, State Key Lab Continental Shale Oil, Daqing 163318, Heilongjiang, Peoples R China
[2] Northeast Petr Univ, Dept Petr Engn, Key Lab Enhanced Oil Recovery, Minist Educ, Daqing 163318, Heilongjiang, Peoples R China
来源：
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2024年 / 73卷
基金：
中国国家自然科学基金;
关键词：
Heavy oil reservoirs; Steam huff and puff; CO2 composite system; Recovery efficiency; Physical simulation; GEOTHERMAL-ENERGY EXTRACTION; INTERFACIAL-TENSION; HORIZONTAL WELLS; SONGLIAO BASIN; PORE STRUCTURE; PERFORMANCE; HYDROGEN; GAS; GASIFICATION; TRANSITION;
D O I：
10.1016/j.ijhydene.2024.05.477
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Injecting CO2 and foaming agents can effectively improve the recovery rate of high cycle steam huff and puff. In this paper, firstly, the influence of oil saturation and injection plug on recovery rate is analyzed using a sand filled pipe physical simulation device. Then, combined with reservoir parameters, the influence of reservoir thickness, interlayer thickness, and oil saturation on the economic limits of development is elucidated. Thirdly, reservoir engineering methods are used to analyze the appropriate timing for injecting foaming agents into the study area. Results show that (a) CO2 dissolves in crude oil, increasing its internal elastic energy and forming a solution gas drive. (b) When the oil saturation is 40 %, the cyclic oil increase is 109 tons, and the oil to gas ratio is 1.09; when the oil saturation is 35 %, the cyclic oil increase rapidly decreases to 38 tons. (c) For the research area, foaming agents should be intervened as early as possible. Foaming agent concentration is 0.4%.
引用
收藏
页码：727 / 735
页数：9
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