非均质多孔介质中CO2-SAG(浸泡-交变-气)混相驱的孔隙尺度模拟

IF 5.3 3区 工程技术 Q2 ENERGY & FUELS
Kaoping Song*, Yuxuan Zhang, Daigang Wang, Jin Chen and Menghao Zhang, 
{"title":"非均质多孔介质中CO2-SAG(浸泡-交变-气)混相驱的孔隙尺度模拟","authors":"Kaoping Song*,&nbsp;Yuxuan Zhang,&nbsp;Daigang Wang,&nbsp;Jin Chen and Menghao Zhang,&nbsp;","doi":"10.1021/acs.energyfuels.4c0540610.1021/acs.energyfuels.4c05406","DOIUrl":null,"url":null,"abstract":"<p >CO<sub>2</sub> miscible flooding is a very promising technology for further increasing oil production in water-flooding reservoirs. However, the low viscosity and density of injected CO<sub>2</sub> can easily lead to gas channeling when the reservoir is strongly heterogeneous, resulting in a diminished capacity for CO<sub>2</sub> to enhance oil recovery. In particular, the underlying mechanisms of oil displacement by CO<sub>2</sub> flooding under various miscible conditions remain unclear, which severely limits the application of the CO<sub>2</sub> miscible flooding to maximize crude oil recovery. By incorporation of an interfacial tension (IFT) term into the open-source twoLiquidMixingFOAM solver, a pore-scale mathematical model of CO<sub>2</sub> flooding considering various miscible conditions is established in this paper. After validating the reliability of the proposed method, the effects of injection rate, IFT, diffusion coefficient, and injection pattern, including continuous CO<sub>2</sub> injection and CO<sub>2</sub>- soaking-alternating-gas (SAG) injection, on the oil recovery performance of CO<sub>2</sub> miscible flooding in a dual-permeability porous media are further investigated. The results show that, as the injection rate increases, the degree of miscibility gradually decreases, indicating that oil recovery is not invariably improved with the increase of injection rate. When the injection rate is relatively low, the decrease in IFT and the increase in the diffusion coefficient cannot effectively recover remaining oil in the low-permeability zone. Increasing the injection rate can gradually increase oil production, while the overall efficiency is still very low. In the miscible CO<sub>2</sub>-SAG process, some remaining oil occupied in the low-permeability zone can migrate into the high-permeability zone, where it mixes with CO<sub>2</sub> and is ultimately recovered. Under identical conditions, the oil recovery rate achieved by miscible CO<sub>2</sub>-SAG injection is higher than that of the continuous CO<sub>2</sub> injection by 16.5%. Thereafter, an innovative multisoaking miscible CO<sub>2</sub>-SAG flooding method is simulated. It is observed that after the first cycle of miscible CO<sub>2</sub>-SAG, more remaining oil in the low-permeability zone can diffuse into the high-permeability zone during the second soaking cycle. Compared to the first cycle of miscible CO<sub>2</sub>-SAG injection, the twice-soaking miscible CO<sub>2</sub>-SAG flooding method can achieve a higher oil recovery rate by 13.8%.</p>","PeriodicalId":35,"journal":{"name":"Energy & Fuels","volume":"39 3","pages":"1559–1569 1559–1569"},"PeriodicalIF":5.3000,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Pore-Scale Modeling of Miscible CO2-SAG (Soaking-Alternating-Gas) Flooding in Heterogeneous Porous Media\",\"authors\":\"Kaoping Song*,&nbsp;Yuxuan Zhang,&nbsp;Daigang Wang,&nbsp;Jin Chen and Menghao Zhang,&nbsp;\",\"doi\":\"10.1021/acs.energyfuels.4c0540610.1021/acs.energyfuels.4c05406\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p >CO<sub>2</sub> miscible flooding is a very promising technology for further increasing oil production in water-flooding reservoirs. However, the low viscosity and density of injected CO<sub>2</sub> can easily lead to gas channeling when the reservoir is strongly heterogeneous, resulting in a diminished capacity for CO<sub>2</sub> to enhance oil recovery. In particular, the underlying mechanisms of oil displacement by CO<sub>2</sub> flooding under various miscible conditions remain unclear, which severely limits the application of the CO<sub>2</sub> miscible flooding to maximize crude oil recovery. By incorporation of an interfacial tension (IFT) term into the open-source twoLiquidMixingFOAM solver, a pore-scale mathematical model of CO<sub>2</sub> flooding considering various miscible conditions is established in this paper. After validating the reliability of the proposed method, the effects of injection rate, IFT, diffusion coefficient, and injection pattern, including continuous CO<sub>2</sub> injection and CO<sub>2</sub>- soaking-alternating-gas (SAG) injection, on the oil recovery performance of CO<sub>2</sub> miscible flooding in a dual-permeability porous media are further investigated. The results show that, as the injection rate increases, the degree of miscibility gradually decreases, indicating that oil recovery is not invariably improved with the increase of injection rate. When the injection rate is relatively low, the decrease in IFT and the increase in the diffusion coefficient cannot effectively recover remaining oil in the low-permeability zone. Increasing the injection rate can gradually increase oil production, while the overall efficiency is still very low. In the miscible CO<sub>2</sub>-SAG process, some remaining oil occupied in the low-permeability zone can migrate into the high-permeability zone, where it mixes with CO<sub>2</sub> and is ultimately recovered. Under identical conditions, the oil recovery rate achieved by miscible CO<sub>2</sub>-SAG injection is higher than that of the continuous CO<sub>2</sub> injection by 16.5%. Thereafter, an innovative multisoaking miscible CO<sub>2</sub>-SAG flooding method is simulated. It is observed that after the first cycle of miscible CO<sub>2</sub>-SAG, more remaining oil in the low-permeability zone can diffuse into the high-permeability zone during the second soaking cycle. Compared to the first cycle of miscible CO<sub>2</sub>-SAG injection, the twice-soaking miscible CO<sub>2</sub>-SAG flooding method can achieve a higher oil recovery rate by 13.8%.</p>\",\"PeriodicalId\":35,\"journal\":{\"name\":\"Energy & Fuels\",\"volume\":\"39 3\",\"pages\":\"1559–1569 1559–1569\"},\"PeriodicalIF\":5.3000,\"publicationDate\":\"2025-01-10\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Energy & Fuels\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://pubs.acs.org/doi/10.1021/acs.energyfuels.4c05406\",\"RegionNum\":3,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"ENERGY & FUELS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Energy & Fuels","FirstCategoryId":"5","ListUrlMain":"https://pubs.acs.org/doi/10.1021/acs.energyfuels.4c05406","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENERGY & FUELS","Score":null,"Total":0}
引用次数: 0

摘要

CO2混相驱是一种非常有前途的技术,可以进一步提高水驱油藏的产油量。然而,当储层非均质性较强时,注入二氧化碳的低粘度和低密度很容易导致气窜,从而降低了二氧化碳提高采收率的能力。特别是,在各种混相条件下,CO2驱油的潜在驱油机制尚不清楚,这严重限制了CO2混相驱的应用,以最大限度地提高原油采收率。通过将界面张力(IFT)项引入到开源的two oliquidmixingfoam求解器中,建立了考虑多种混相条件的CO2驱油孔隙尺度数学模型。在验证了该方法的可靠性之后,进一步研究了注入速率、IFT、扩散系数和注入方式(包括连续注入CO2和CO2-浸泡-交变气(SAG)注入)对双渗透多孔介质中CO2混相驱采油性能的影响。结果表明,随着注入速度的增加,混相度逐渐降低,表明随着注入速度的增加,采收率并不一定提高。当注入速度较低时,IFT的减小和扩散系数的增大不能有效地回收低渗透层的剩余油。提高注入速度可以逐步提高产油量,但整体效率仍然很低。在CO2- sag混相过程中,低渗透层的部分剩余油运移到高渗透层,与CO2混合,最终被采出。在相同条件下,CO2- sag混相注油采收率比连续注油采收率高16.5%。在此基础上,模拟了一种创新的CO2-SAG多浸泡混相驱方法。结果表明,经过第一轮CO2-SAG混相作用后,低渗透层剩余油在第二次浸透循环中向高渗透层扩散。与第一次注混相CO2-SAG相比,两次浸混相CO2-SAG驱油方法的采收率提高了13.8%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Pore-Scale Modeling of Miscible CO2-SAG (Soaking-Alternating-Gas) Flooding in Heterogeneous Porous Media

Pore-Scale Modeling of Miscible CO2-SAG (Soaking-Alternating-Gas) Flooding in Heterogeneous Porous Media

CO2 miscible flooding is a very promising technology for further increasing oil production in water-flooding reservoirs. However, the low viscosity and density of injected CO2 can easily lead to gas channeling when the reservoir is strongly heterogeneous, resulting in a diminished capacity for CO2 to enhance oil recovery. In particular, the underlying mechanisms of oil displacement by CO2 flooding under various miscible conditions remain unclear, which severely limits the application of the CO2 miscible flooding to maximize crude oil recovery. By incorporation of an interfacial tension (IFT) term into the open-source twoLiquidMixingFOAM solver, a pore-scale mathematical model of CO2 flooding considering various miscible conditions is established in this paper. After validating the reliability of the proposed method, the effects of injection rate, IFT, diffusion coefficient, and injection pattern, including continuous CO2 injection and CO2- soaking-alternating-gas (SAG) injection, on the oil recovery performance of CO2 miscible flooding in a dual-permeability porous media are further investigated. The results show that, as the injection rate increases, the degree of miscibility gradually decreases, indicating that oil recovery is not invariably improved with the increase of injection rate. When the injection rate is relatively low, the decrease in IFT and the increase in the diffusion coefficient cannot effectively recover remaining oil in the low-permeability zone. Increasing the injection rate can gradually increase oil production, while the overall efficiency is still very low. In the miscible CO2-SAG process, some remaining oil occupied in the low-permeability zone can migrate into the high-permeability zone, where it mixes with CO2 and is ultimately recovered. Under identical conditions, the oil recovery rate achieved by miscible CO2-SAG injection is higher than that of the continuous CO2 injection by 16.5%. Thereafter, an innovative multisoaking miscible CO2-SAG flooding method is simulated. It is observed that after the first cycle of miscible CO2-SAG, more remaining oil in the low-permeability zone can diffuse into the high-permeability zone during the second soaking cycle. Compared to the first cycle of miscible CO2-SAG injection, the twice-soaking miscible CO2-SAG flooding method can achieve a higher oil recovery rate by 13.8%.

求助全文
通过发布文献求助,成功后即可免费获取论文全文。 去求助
来源期刊
Energy & Fuels
Energy & Fuels 工程技术-工程:化工
CiteScore
9.20
自引率
13.20%
发文量
1101
审稿时长
2.1 months
期刊介绍: Energy & Fuels publishes reports of research in the technical area defined by the intersection of the disciplines of chemistry and chemical engineering and the application domain of non-nuclear energy and fuels. This includes research directed at the formation of, exploration for, and production of fossil fuels and biomass; the properties and structure or molecular composition of both raw fuels and refined products; the chemistry involved in the processing and utilization of fuels; fuel cells and their applications; and the analytical and instrumental techniques used in investigations of the foregoing areas.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:604180095
Book学术官方微信