Effect of gravity segregation on CO2 flooding under various pressure conditions: Application to CO2 sequestration and oil production

This research evaluates the effect of gravity segregation on CO2 sequestration and oil production during CO2 flooding under immiscible, near-miscible, and miscible conditions. The core experiment results show that CO2 flooding recovery was seriously affected by gravity under immiscible conditions, w...

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Veröffentlicht in:Energy (Oxford) 2021-07, Vol.226, p.120294, Article 120294
Hauptverfasser: Xiaolong, Chen, Yiqiang, Li, Xiang, Tang, Huan, Qi, Xuebing, Sun, Jianghao, Luo
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Yiqiang, Li
Xiang, Tang
Huan, Qi
Xuebing, Sun
Jianghao, Luo
description This research evaluates the effect of gravity segregation on CO2 sequestration and oil production during CO2 flooding under immiscible, near-miscible, and miscible conditions. The core experiment results show that CO2 flooding recovery was seriously affected by gravity under immiscible conditions, while under miscible conditions, this influence was not apparent. Visual experiments show when immiscible, gravity restricts the oil and gas front’s stability, and different gas injection strategies have evident differences in the swept region; when miscible, gravity has almost no effect on the swept region. These results indicate that when CO2 immiscible flooding is implemented, the reservoir thickness affects the choice of gas injection direction. However, for miscible flooding, the reservoir thickness and gas injection direction are not essential for developing CO2 flooding. In immiscible conditions, gas injection velocity greatly restricts the CO2 gravity flooding recovery; in miscible conditions, the velocity is no longer the main influencing index of CO2 gravity flooding recovery. For CO2 sequestration, gravity segregation is conducive to increasing CO2 sequestration potential. As the pressure increases, the influence of gravity on CO2 sequestration weakens. Regardless of whether there is gravity effect, the best oil recovery and gas sequestration potential of CO2 flooding is obtained under miscible conditions. •The combined effects of miscibility and gravity on CO2-EOR and storage are clarified.•For immiscible CO2-EOR, reservoir thickness affects the choice of injection strategy.•For miscible CO2-EOR, reservoir thickness and injection direction are not essential.•The best recovery and sequestration of CO2-EOR is obtained under miscible conditions.
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The core experiment results show that CO2 flooding recovery was seriously affected by gravity under immiscible conditions, while under miscible conditions, this influence was not apparent. Visual experiments show when immiscible, gravity restricts the oil and gas front’s stability, and different gas injection strategies have evident differences in the swept region; when miscible, gravity has almost no effect on the swept region. These results indicate that when CO2 immiscible flooding is implemented, the reservoir thickness affects the choice of gas injection direction. However, for miscible flooding, the reservoir thickness and gas injection direction are not essential for developing CO2 flooding. In immiscible conditions, gas injection velocity greatly restricts the CO2 gravity flooding recovery; in miscible conditions, the velocity is no longer the main influencing index of CO2 gravity flooding recovery. For CO2 sequestration, gravity segregation is conducive to increasing CO2 sequestration potential. As the pressure increases, the influence of gravity on CO2 sequestration weakens. Regardless of whether there is gravity effect, the best oil recovery and gas sequestration potential of CO2 flooding is obtained under miscible conditions. •The combined effects of miscibility and gravity on CO2-EOR and storage are clarified.•For immiscible CO2-EOR, reservoir thickness affects the choice of injection strategy.•For miscible CO2-EOR, reservoir thickness and injection direction are not essential.•The best recovery and sequestration of CO2-EOR is obtained under miscible conditions.</description><identifier>ISSN: 0360-5442</identifier><identifier>EISSN: 1873-6785</identifier><identifier>DOI: 10.1016/j.energy.2021.120294</identifier><language>eng</language><publisher>Oxford: Elsevier Ltd</publisher><subject>Carbon dioxide ; Carbon dioxide fixation ; Carbon sequestration ; CO2 sequestration ; Flooding ; Gas injection ; Gravitational effects ; Gravity ; Gravity effects ; Injection ; Miscibility ; Oil ; Oil recovery ; Petroleum production ; Recovery ; Reservoirs ; Thickness ; Velocity ; Visualization experiment</subject><ispartof>Energy (Oxford), 2021-07, Vol.226, p.120294, Article 120294</ispartof><rights>2021 Elsevier Ltd</rights><rights>Copyright Elsevier BV Jul 1, 2021</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c334t-222665c82952684ee2d8b70eaa5b7d35c7a7e999fe5f77d8deb15431402a72f93</citedby><cites>FETCH-LOGICAL-c334t-222665c82952684ee2d8b70eaa5b7d35c7a7e999fe5f77d8deb15431402a72f93</cites><orcidid>0000-0001-5242-9798 ; 0000-0002-1335-943X</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.energy.2021.120294$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,780,784,3550,27924,27925,45995</link.rule.ids></links><search><creatorcontrib>Xiaolong, Chen</creatorcontrib><creatorcontrib>Yiqiang, Li</creatorcontrib><creatorcontrib>Xiang, Tang</creatorcontrib><creatorcontrib>Huan, Qi</creatorcontrib><creatorcontrib>Xuebing, Sun</creatorcontrib><creatorcontrib>Jianghao, Luo</creatorcontrib><title>Effect of gravity segregation on CO2 flooding under various pressure conditions: Application to CO2 sequestration and oil production</title><title>Energy (Oxford)</title><description>This research evaluates the effect of gravity segregation on CO2 sequestration and oil production during CO2 flooding under immiscible, near-miscible, and miscible conditions. The core experiment results show that CO2 flooding recovery was seriously affected by gravity under immiscible conditions, while under miscible conditions, this influence was not apparent. Visual experiments show when immiscible, gravity restricts the oil and gas front’s stability, and different gas injection strategies have evident differences in the swept region; when miscible, gravity has almost no effect on the swept region. These results indicate that when CO2 immiscible flooding is implemented, the reservoir thickness affects the choice of gas injection direction. However, for miscible flooding, the reservoir thickness and gas injection direction are not essential for developing CO2 flooding. In immiscible conditions, gas injection velocity greatly restricts the CO2 gravity flooding recovery; in miscible conditions, the velocity is no longer the main influencing index of CO2 gravity flooding recovery. For CO2 sequestration, gravity segregation is conducive to increasing CO2 sequestration potential. As the pressure increases, the influence of gravity on CO2 sequestration weakens. 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subjects Carbon dioxide
Carbon dioxide fixation
Carbon sequestration
CO2 sequestration
Flooding
Gas injection
Gravitational effects
Gravity
Gravity effects
Injection
Miscibility
Oil
Oil recovery
Petroleum production
Recovery
Reservoirs
Thickness
Velocity
Visualization experiment
title Effect of gravity segregation on CO2 flooding under various pressure conditions: Application to CO2 sequestration and oil production
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